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TECHNICAL MEMORANDUM HYDROLOGIC CHARACTERISTICS OF THE KISSIMMEE RIVER FLOODPLAIN BONEY MARSH EXPERIMENTAL AREA Ronald Mierau, Data Management Division Paul Trimble, Water Resources Division September 1988 Resource Planning Department South Florida Water Management District

TECHNICAL MEMORANDUM - Florida International …dpanther.fiu.edu/sobek/content/FI/12/09/02/46/00001/FI12090246.pdf · sharp-crested weirs as presented in Handbook of Hydraulics

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TECHNICAL MEMORANDUM

HYDROLOGIC CHARACTERISTICS OF THEKISSIMMEE RIVER FLOODPLAIN

BONEY MARSH EXPERIMENTAL AREA

Ronald Mierau, Data Management DivisionPaul Trimble, Water Resources Division

September 1988

Resource Planning DepartmentSouth Florida Water Management District

EXECUTIVE SUMMARY

Channelization of the Kissimmee River in the mid and late 1960s for flood

control and navigation caused broad areas of marsh in the former floodplain to drain

much more rapidly. Concern over possible adverse environmental and water quality

impacts prompted a study on the former floodplain to address the effects of reflooding

the marsh areas, particularly in regard to revegetation characteristics and nutrient

uptake of the developing marsh vegetation.

Hydrologic monitoring was established to support these objectives. An inter-

disciplinary approach was used to design the monitoring system. This design

approach allowed significant conclusions to be drawn from the hydrologic data

independent of this support function. This report documents the hydrologic and

hydraulic operation of the project over the period 1976 to 1986 and presents

conclusions that may be of significant impact to South Florida Water Management

District operations and environmental restoration programs.

. This work found the following hydrologic and hydraulic parameters to be

appropriate for the study area:

A) Flow equations - A standard submerged weir equation developed for

sharp-crested weirs as presented in Handbook of Hydraulics (King & Brater,

1963) serves adequately when a weir coefficient of 3.0 is used even though the

breadth of the weir in the flow direction departs significantly from the sharp-

crested assumption.

B) Evapotranspiration from marsh vegetation of this type under

predominantly wet conditions can be represented by 0.70 times class A pan

evaporation.

C) Seepage through this type of floodplain material is quite low and can be

represented in acre-feet as 0.06 times the head difference across the levee in

feet times the number of miles of levee over which this head acts.

D) Net runoff defined as surplus rainfall that flows out of a catchment area is

very low. In contrast to most areas within the District which yield runoff

values in the range of 10 to 15 inches per year (including the Kissimmee

Basins), runoff values from this area averaged -8 inches, a net difference of 18

to 23 inches of water that would otherwise be available for downstream uses.

While part of this difference might be explained by rainfall values which were

somewhat lower than normal, rainfall differences cannot explain this large a

discrepancy.

Under natural drainage conditions, common throughout Florida, runoff is

expected to be generated even under severely dry conditions. This is due to the

timing of rainfall events. Usually at some time of the year the rainfall rate

exceeds the capacity of local storage to trap the excess water. It is during these

times that runoff occurs.

The major cause of the negative runoff values is probably the practice of

artificially imposing water level fluctuations which do not reflect weather

conditions. Under the regulation schedule used, water levels were held above

the land surface except during part of May and June. Thus, through most of

the dry season, the vegetation was not stressed by drought as is usually the

case. In addition, in most years, May and June had adequate rainfall to supply

the full evapotranspiration potential of the vegetation. Further, the extra

storage provided in June due to the drawdown was capable of capturing part of

the large rains which may be expected at this time of the year. A regulation

schedule based on rainfall patterns such as that used for deliveries to

Everglades National Park may have provided a more realistic runoff pattern

(Neidrauer and Cooper, in publication 1988).

This study has important implications on several issues central to

District objectives.

A) Water supply

Maintaining minimum water levels in a marsh system, regardless of

local rainfall conditions, may change a marsh area from a net runoff

producing area to a net consumer of water. This may well be true in

marshes which form a part of a water supply system such as the City of

West Palm Beach's catchment area, as well as restoration of flow-through

marshes similar to those proposed for the Kissimmee River Valley. There

is some evidence that this might also apply to a lesser degree to the use of

marsh areas as detention or retention systems. The magnitude of the

potential reduction in water supply capability is beyond the scope of this

study as it is influenced by upstream and downstream storage capacity,

local drainage characteristics, local rainfall intensity, seepage and

vegetation characteristics.

B) Kissimmee River Demonstration Project

The Kissimmee River Demonstration Project is a program to restore

a portion of the channelized Kissimmee River to a more natural flow

pattern. Monitoring the test portion and the development of an extensive

physical and mathematical model through the demonstration will provide

valuable insight into detailed design and the effectiveness of a more

general restoration.

The results of this study complement the objectives of the demon-

stration and may help in model calibration as well as interpretation of the

model results. Of particular applicability is:

a) Flow resistance changes over time.

b) The possibility of utilizing rainfall based regulation schedules to

provide required stage fluctuations concurrent with conserving water.

C) Flow Resistance

A nonlinear increase in resistance to flow offered by the marsh vege-

tation as it succeeded from overdrained to restored marsh communities

was observed. This increase was quite substantial and should be

considered in interpreting floodplain modeling results, if not in the actual

model.

The absolute magnitude of the flow resistance parameters computed

under this study are suspect as they are unreasonably high (on the order

of two to five times expected values) in comparison with work by other

researchers. This is attributed to highly unfavorable flow conditions for

this type of analysis during the study period. The conditions of steady,

uniform flow were only grossly approximated due to the pumping

schedule imposed. An experiment is planned for the summer of 1988 to

better refine parameters of flow resistance under current conditions.

Though the absolute magnitude of the flow resistance presented in

this study is questionable, the conditions under which the measurements

were made did not change appreciably except for vegetative changes

throughout the duration of the project. The study results should provide a

good approximation of changes in flow resistance over time. This is

important because no information in the scientific literature provided

insight into the magnitude or the rate of change which could be expected

under marsh restoration conditions.

D) Error Analysis

More attention was paid to error analysis in the hydrologic water

budget than is standard in this type of study. Of particular interest is the

magnitude of the increase in expected error as the time interval of compu-

tation is decreased since this has significant impact on the design of

monitoring systems. A large portion of the errors in water budgets with

time scales less than a year is due to an inability to reliably estimate

changes in storage. This implies a more dense water level monitoring

network than normal is required if reliable daily or monthly water

budgets are desired.

TABLE OF CONTENTS

Page

Executive Summary ........................................... i

List of Figures .................................................. viii

List of Tables ................................................ viii

Acknowledgments ............................................. ix

Abstract ......................................................... x

Key Words ....................................... . x

Preface ....................................................... xi

I. INTRODUCTION ............................................. 1

II. DESCRIPTION OF THE AREA ................................. 3

III. FLOW RESISTANCE CHARACTERISTICS OF THE

MARSHAREA ....................................... 7

IV. WATER BUDGET DATA ................................ 13

V. WATER BUDGET PHASE 1 ................................ 18

A. Methodology .............................................. 18

B. Interpretation ofError ..................................... 23

C. Discussion .............................................. 27

VI. WATER BUDGET PHASE 2 .................................. 28

A. Methodology .............................................. 28

B. Interpretation of Error ................................... 33

C. Discussion ................................................ 35

VII. CONCLUSION ............................................... 43

BIBLIOGRAPHY ............................................. 46

APPENDICES

Appendix A. Estimated Average Stage (Western Marsh Area) ....... A-1

Appendix B. Estimated Average Stage (Eastern Marsh Area) ....... B-1

Appendix C. Rainfall ................. ......................... C-1

Appendix D. Pan Evaporation (S-65C) ........................... D-1

Appendix E. North Weir Discharges ............................... E-1

Appendix F. South Weir Discharges .............................. F-1

Appendix G. South Culvert Discharges (Phase 1) .................. G-1

Appendix H. North Pump Flows (Phase 1) .......................... H-1

Appendix I. South Pump Flows (Phase 1) .......................... I-1

Appendix J. Monthly Water Budget .............................. J-1

LIST OF FIGURES

1. Boney Dike Experimental Marsh Area .......................... 2

2. Stage-Storage Curve for the Western Marsh Area ............... 8

3. Stage-Storage Curve for Eastern Marsh Area ........ ....... 9

4. Stage-Storage Curve for the Canal ............................. 10

5. Manning's"N" Coefficient Versus Time ........................ 14

6. Manning's "N" Versus Depth of Water ......... ............ 15

7. Overall Water Budget (Phase 1)

a. Canal .......... ............................... 29

b. Western Marsh Area .................................... 30

c. Eastern Marsh Area ...................................... 31

8. Overall Water Budget (Phase 2) .............................. 36

9. Annual Average Rainfall Map for South Florida .................. 40

10. Annual LongTerm Rainfall Bar Plot .......................... 41

LIST OF TABLES

Page

1. Periods of Missing Data ........................................ 17

2. Optimized Coefficients ......................................... 24

3. Mass Balance Errors (Phase 1) .................................. 24

4. Daily RMS Errors (Phase 1) ................................... 25

5. Monthly RMS Errors (Phase 1) .................................. 25

6. Annual Water Budget (Phase 1) ................................. 28

7. Annual Error Analysis (Phase 2) .............................. 34

8. Ratio of Error to Volume of Flow (Phase 2) ....................... 35

9. Annual Water Budget (Phase 2) .............................. 37

10. Typical Unit Runoff from South Florida Watersheds .............. 39

viii

ACKNOWLEDGMENTS

The authors wish to thank the many individuals who contributed to the review

and documentation of this report. Several engineers from the South Florida Water

Management District, including Dr. Jayantha Obeysekera, Shawn Sculley, Brian

Turcotte, Chuck Padera, Kevin Dickson, Leslie Wedderburn, and Alan Hall,

contributed to the comprehensive review of this report. In addition, Dr. H. W. Shen

from the Civil Engineering Department of the University of California at Berkeley

and Dr. R. H. Kadlec from the University of Michigan's Wetlands Ecosystem

Research Groups graciously extended their expert comments on the results of this

study.

Steve Davis supplied valuable information concerning vegetation changes

during the study period. Morris Rosen supplied a fine interpretive analysis of

geologic characteristics. Special thanks need to be given to numerous technicians in

Data Management Division for the extensive effort in collecting and reducing the

hydrologic information collected over the ten-year study period; Dee Azeredo, Ray

Santee, and Karen Lythgoe for their part in processing and analyzing the massive

amount of breakpoint data collected for this project; Dawn Reid, Karen Lythgoe, and

Barbara Brown for preparing the graphics, and finally Carol Goff for her patience in

typing and making revisions to this report.

ABSTRACT

Ten years of operation are documented for a controlled experiment to

determine the environmental, hydrological, and water quality effects of marsh

restorations in the Kissimmee River Floodplain. This paper uses a water budget to

calibrate and then verify the key hydrologic parameters: rainfall, evapo-

transpiration, seepage, and flow. A unique design provided an unusual opportunity

to quantify errors associated with flow, and rainfall/evapotranspiration largely

independently.

Hydrologic control was quite good. This is reflected in an expected error of less

than 2% of the annual flow leaving the area. This error increased dramatically as

the time interval for analysis was reduced to a month or day basis. Uncertainty in

storage fluctuations were the major source of errors.

A nonlinear increase in resistance to flow offered by the marsh vegetation as it

adapted from overdrained to restored marsh conditions was observed. Although the

absolute magnitude of the. flow resistance term seems unreasonably high, the rate of

increase over time seems reasonable.

Runoff values were extremely low during the study period. In fact, signifi-

cantly more water was supplied as pumped inflow and rainfall than left the area as

measured outflow. This probably resulted from a combination of forced inflow and

strict water level fluctuations imposed based on historical fluctuations rather than

on meteorological conditions.

KEY WORDS

KISSIMMEE RIVER, FLOW, RAINFALL, MANNING'S N, SEEPAGE,

ENVIRONMENTAL RESTORATION, CONSUMPTIVE USE OF MARSH

VEGETATION.

PREFACE - HISTORICAL PERSPECTIVE

Channelization of the Kissimmee River in the mid and late 1960s for the

purposes of flood control and navigation caused broad areas of marsh in the former

floodplain to drain much more rapidly than had occurred historically. This

observation caused concern over possible adverse environmental and water quality

impacts due to the channelization. It also raised questions as to what measures

could be taken to reduce these impacts and how effective these measures would be.

By the mid 1970s these concerns had matured to the point where the Boney

Dike Experimental Area was established by a parent agency of the South Florida

Water Management District. The design of the area was constrained by the need to

evaluate the effectiveness of restoration alternatives. Two alternatives for restoring

environmental conditions in the floodplain marshes were evident at that time. The

first was to raise pool elevations at the intermediate control structures S-65A, S-65B,

S-65C, S-65D, and S-65E, either with a static or fluctuating regulation schedule

which would allow flooding the marshes at the lower end of each of the intermediate

river sections. The second alternative was to partially constrict or plug selected

reaches of the new channel to cause a more spatially uniform raising of water levels

during periods of moderate to high flow rates while allowing water levels to return to

level pool conditions during periods of low flow. In addition to the obvious

differences in areal extent of marshes which would be flooded and cost differences, a

real question remained on possible differences in nutrient uptake and revegetation

characteristics between the first option which was called "static pool" and the second

option which was termed "flow through".

While evaluation of these alternatives primarily determined the size and

configuration of the experimental area, an interdisciplinary approach was used to

incorporate features which would prove useful in answering other basic questions

without compromising the primary objectives. Consideration was given to

determining consumptive use of water by natural vegetation, obtaining detailed

meteorological parameters for possible correlation with evapotranspiration, as well

as evaluation of experimental instrumentation. Special emphasis was placed on

design for cross verification of elusive water budget parameters such as seepage and

evapotranspiration. Provisions were made for determining the resistance to

overland flow provided by marsh vegetation although practical pumping schedules

resulted in very poor conditions for this type of analysis.

An attempt was made to provide detailed meteorologic information including

wind speed, wind direction, air temperature, relative humidity, pan evaporation,

and rainfall for the purpose of basic research. This attempt was to a large degree

unsuccessful due to the primitive state of automated instrumentation available in

the mid 1970s. The result of this supplemental data collection is not presented in

this paper.

This publication incorporates hydrologic analysis completed for the period

1976 to 1978 which was presented in preliminary form (Trimble and Mierau, 1980)

with analysis of data for the period 1979 to 1986. " Since data is still being collected,

an addendum presenting the additional data will be published after the study area is

dismantled.

This work is closely related to studies documented in two existing publications

(Trimble and Mierau,. 1980; Davis, 1981). Two publications scheduled for 1989,

Boney Marsh Nutrient Budget and Emergent Vegetation in Boney Marsh, will also

relate strongly to this work. Further work in refining flow resistance in this marsh

area is scheduled for the summer of 1988.

I. INTRODUCTION

An analysis of the water budget for the Boney Marsh experimental area has

been completed for the period from March 26, 1976 through February 28, 1986. This

marsh area is located in the floodplain along the west bank of the former Kissimmee

River just north of structure S-65B (see Figure 1). The experimental area is a unique

system of levees and discharge structures especially designed for a quantitative

study of vegetation changes, nutrient uptake, and hydrological characteristics of a

riverine marsh system. Levees divide the area into two separate reservoirs--the

western and eastern marsh areas. During the first part of the study, stages in both

these areas were fluctuated seasonally to approximate the average stage

fluctuations in the Kissimmee River flood plain prior to channelization (Davis,

1981). Later portions of the study concentrated on the western area only. The

western area was forced to experience large inflows and outflows while the eastern

area had only the minimal inflows and outflows that were required to maintain the

desired stage fluctuations.

A water budget approach was used as the primary technique for hydrologic

analysis. The design of this project offered a unique opportunity to indirectly

quantify parameters that are normally lumped into a residual error term in many

water budget analyses. This allowed a very good quantification of flow, rainfall,

seepage, and evapotranspiration. The index used for evapotranspiration should be

transferable to vegetation of similar type. Seepage estimates were judged to be quite

reliable for this project but may not be highly transferable due to very non-uniform

soils. Loadings computed for the conservative parameters measured (Davis, 1981)

provided further evidence of the quality of the computed parameters. Davis showed

good agreement for chloride transport even when the seepage term was ignored.

Inclusion of computed seepage in his analysis would have further improved the

chloride budget.

BONEY MARSHI

SPUmP LOCATIONO STAGE RECORDER

WEIR LOCATIONCULVERT IWCATIONWEATHER STATION

Figure 1.

_ ~~~_ ___~____

_ _ _ _ __ ____ _ _ ___ __

A detailed analysis of errors associated with the water budget is presented in

later sections of this report as well as the variation in errors which can be expected

as a function of the time step required.

During phase 1 of this study, daily water budgets for these areas were

determined to support analysis of the environmental and water quality impacts of

flow-through marsh restoration versus non-flow (ponded) restoration of marshy

areas in the Kissimmee River Valley under identical meteorological conditions. The

magnitude of the different components of the water budget were determined through

a calibration procedure using hydrologic data for the period from March 26, 1976 to

December 31, 1978. The results of this study were originally documented as a

memorandum report (Trimble and Mierau, 1980).

During the second phase of this study, only the western reservoir was modeled

for the purpose of further evaluation of nutrient uptake under high flow conditions.

This phase of the study was completed using hydrologic data for the period from

March 1, 1979 to February 28, 1986. Phase 2 was also useful as a verification period

for the hydrologic relationships derived in phase 1 of this study.

The purpose of this report is to present estimates of the inflows and outflows

associated with the Boney Marsh water budget. Also included in this report is a

description of the study area with an explanation of the methodology used to

estimate the water budget. A third feature of this report is a preliminary estimate of

resistance to flow provided by marsh vegetation in the Kissimmee River Valley.

II. DESCRIPTION OF THE AREA

Approximately 4.6 miles of levees divide the marsh area into two separate

reservoirs and a canal. The canal is located at the northern boundary of the marsh

for the purpose of supplying water from the Kissimmee River channel to the western

flow through area. The north pump is located at the eastern end of the canal to draw

the water from the Kissimmee River into the canal while the north weir at the

western end regulates flow leaving the canal and entering the western flow through

area. Prior to entering the flow-through area, water from the north weir passes

through a distribution channel and spreader berm to distribute flow evenly over the

northern portion of the marsh. This berm was designed to ensure that the water does

not short circuit the marsh by flowing along the east levee towards the south weir. A

prearranged pumping schedule is imposed on the north pump to provide the desired

flow-through schedule based on environmental study criteria. The weir at the south

end is adjusted frequently to impose a scheduled seasonal fluctuation of water levels

irrespective of flow considerations.

The Boney Marsh climate is classified as a wet subtropical climate (Koeppen,

1931). This area receives on the average about 48 inches of rain per year. Hot humid

tropical air dominates the region through the wet season months (May-October)

during which rainfall is generated from local convective activity and by tropical

disturbances that pass through the area. The wet season period accounts for

approximately 36 inches of the total rainfall that the Boney marsh receives while the

mean daily temperature averages 80° Fahrenheit from June through September.

May and October are slightly cooler with mean daily temperatures ranging in the

mid-seventies on the Fahrenheit scale.

The dry season months (November-April) are dominated by cooler drier air.

Rainfall occurs mainly due to occasional frontal passages and averages 12 inches per

year. The mean daily temperature varies more during the dry season months with

the normal value for January being in the low 60s while April's mean daily

temperature averages in the low 70s on the Fahrenheit scale (MacVicar, 1981).

Soils in the study area consist of sand and shell overlain by a variable layer of

muck, peat and undecomposed organic matter. Pockets of sandy silt and clay are

scattered throughout the area. Organic material is prevalent in the upper three feet

of the soil profile in pockets at least two feet deep and in layers interspersed with

sand and other inorganic material. This type of soil profile is often found in

floodplain with meandering river channels.

Rosen, 1974, describes two probable mechanisms for the formation of the upper

three feet of this soil profile. Alternating layers of organic and inorganic soils were

formed by the deposition of inorganic material during generalized flooding

accompanied by flow velocities adequate to scour this material from upstream

sources. This was followed by deposition of plant material from local sources or from

less severe flood events carrying primarily organic material.

A second mechanism caused the formation of the pockets of organic material.

The Kissimmee River was a dynamic river. Measured on a time scale of decades, the

wide sweeping oxbows could be seen migrating downstream in a continuous process

of erosion and deposition. At one time the active river channel was located well into

the current flow-through marsh area. The river scoured the layered deposits in the

process of channel migration leaving a well defined river channel. As the river

channel continued to migrate in a manner characteristic of meandering rivers, these

scoured areas were cut off from the main channel leaving quiescent pools in which

organic material built up to greater depths.

The topography of the flow-through marsh is naturally quite regular with a

slight slope to the south. Natural grades were not altered. Depth of water is fairly

constant during steady flow conditions with a spatial variation of depth on the order

of 6 inches. There is a slight tendency for increased depths to follow a meandering

pattern through the area, although for the most part, they are irregularly

distributed. The area of the flow-through portion is 120 acres.

The eastern area was designed to provide a control experiment for the effects of

the artificially induced flow in the flow-through area. The design concept was to

maintain identical water level fluctuations in both the flow-through and the control

impoundment area. Operational strategy for the east area was to add or remove as

small a volume of water as possible consistent with meeting the regulation schedule.

Water was added by the south pump and removed by the south culvert to meet these

objectives. Surface area of the eastern area is 230 acres. Land elevations are not as

uniform in this portion as they are in the western area. Variations from a plane

surface are on the order of 1 to 14 feet with the highest elevations occurring in the

northwestern portion. Subsequent to completion of phase 1, the south pump was

removed and operation of the south culvert was not well documented. The dike

separating the eastern area from the Kissimmee River was also removed at a later

date.

Vegetation at the time of project initiation could be classified as 'wet prairie'.

Predominant species were grasses and sedges. Detailed records of the distribution of

vegetative species on a spatial and time-series basis are maintained in the records of

the Environmental Science Division, South Florida Water Management District.

This type of vegetation is characterized by a very dense cover near ground level

which thins rapidly in the range of 6-12 inches above land surface to only isolated

stems above 18 inches. Foliage is often quite lush near the ground surface,

particularly when not subjected to drought conditions. This would tend to indicate

moderate to relatively large transpiration characteristics. The evaporation

component would not be suppressed by shading to the extent of some other taller

marsh/slough vegetation types under flooding conditions; on the other hand, a larger

portion of the leaf area would be submerged during flooding reducing the

transpiration component. Resistance to flow is expected to be very large at shallow

flow depths due to the vegetation density and decrease dramatically with increasing

flow depths up to 12-18 inches. This type of vegetation is often found on sandy soils

which are inundated for a significant portion of the year but also dry out regularly.

It is common in the higher elevations of floodplain and poorly drained upland areas

north of Lake Okeechobee.

Vegetation at the time of this report would, to the casual observer, be

characterized by much the same type of vegetation as when the project was initiated

with the major difference being the lushness and density of vegetation. A change in

species composition from grasses and sedges toward broader leaved species such as

Sagittaria and Pontederia was observed by District biologists. Substantial detritus

buildup occurred resulting in a much denser tangle of old plants in various stages of

decomposition than when the project was initiated. There is also more woody, brush

type vegetation at the north end of the flow-through area and in the former nonflow-

through area. Quantitative estimates of change in vegetation density with time and

height above ground surface is not available at this time.

Stage-storage curves for both marshes and the canal appear in Figures 2, 3 and

4, respectively. The relationships for the eastern and western marshes were

estimated from topographic maps at 0.5 foot contours while the stage-storage

relationship for the canal was based on the original canal design.

III. FLOW RESISTANCE CHARACTERISTICS

OF THE MARSH AREA

Initial filling of the flow-through area in 1976 provided an opportunity to

observe the flow characteristics of the marsh prior to any changes which might occur

due to reflooding. Experimental difficulties prevented compiling reliable

quantitative information. Qualitative observations, however, do shed some light on

the hydraulic characteristics of this marsh area.

Quasi-steady state uniform flow was expected in the marsh during the filling

operation. That is, a fairly uniform slope of the water surface was expected which

would allow the computation of flow resistance at several flow depths. Six

temporary supplemental water level stations were established along the flow profile

in addition to the marsh ends to verify the uniformity of the hydraulic gradient. The

water surface profile which developed during the filling operation was not at all like

oooo.q oooo ooo 0 ooo o

Stage In Fet--NVD

Figure 2. Stage-Storage Curve forthe Western Marsh Area

Cd

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frd

in

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oooo o.90o0 o.oo. q.0

Stage in Feet-NGVD

Figure 3. Stage-Storage Curve for Eastern Marsh Area

0o4

o

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00:

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N

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Stage In Feet-NOVD

" . ar n-igure 4. Stage-Sntorage ..u ve ir e. u. =,.

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m

that expected. The temporary monitoring system was thus totally inadequate to

describe the developing flow profile.

An abrupt wetting front developed which progressed uniformly, similar to a

wave front, the length of the flow-through marsh. Water levels increased rapidly at

the leading edge of this wave from zero to the range of 12-18 inches within approxi-

mately 100 feet of the leading edge of the wave. Water levels behind this transition

zone were very flat. The monitoring system was not precise enough to quantify the

slope behind the transition zone nor dense enough to describe the transition zone

itself. The third order surveys which were used to provide reference elevations for

the intermediate measuring stations were inadequate to provide reliable estimates

of the slope of the apparently flat water surface. The measuring stations were

inadvertently disturbed before it was possible to make precise datum adjustments.

Quantitative estimates of this initial filling period are thus not available.

It has not been possible to implement a comprehensive test program to

determine flow resistance characteristics subsequent to the initial filling without

compromising the original long-term water quality and environmental objectives.

These studies are now nearing completion. A monitoring program designed

specifically to quantify the flow resistance characteristics should be implemented

prior to dismantling the project.

There is a large set of stage and flow. data which can be used to obtain

approximate estimates of flow resistance. This information is not ideally suited to

this type of analysis because true steady-state conditions were very rare during the

operating period. In general, flow through the area was initiated by pumping

approximately 8 hours per day with pumps off the rest of the day. This caused water

levels to increase significantly during the time the pumps were on and decrease to a

lower level during the portion of the day the pumps were off. This trend was more

pronounced at the upstream end of the flow-through area than on the downstream

end and also more pronounced at smaller flow depths than at the higher end of the

regulation schedule. This data, however, is the only information available to

document changes in resistance with changes in vegetation due to reflooding.

The data was first divided into three equal sets based on dates of collection (the

early, intermediate, and final time periods). These three sets were then screened to

eliminate the most radical departures from steady flow conditions. The criteria used

was the absolute value of difference in daily flow in and out could not exceed 20% of

the average of these two daily flows. The data was further restricted by ensuring

that the average daily upstream stage exceeded the average daily downstream stage,

and by eliminating all missing or estimated data. Manning's n was computed for

each of the qualifying average daily flow values with the depth based on the average

of the daily upstream and downstream stages minus the average land elevation. The

hydraulic gradient, S, was computed as the difference in average daily upstream and

downstream stage divided by the distance between upstream and downstream

gauges. The index to flow resistance (Manning's n) was computed using the formula:

1.48

Qwhere n is Manning's n

Q is average daily flow in CFS

w is the width of the area in feet

d is the average flow depth in feet

S is the hydraulic gradient (slope of the water surface)

The computed Manning's n values which ranged between 1 and 4 are generally

much larger than those normally found in documentation. This can partially be

explained by the very thick vegetation that is found in South Florida's marsh areas.

In an earlier study, the value of the Manning's coefficient was estimated to range

between .3 and 1.2 for the water conservation areas (Lin and Shih, 1979). The

Manning's n values computed for the Boney Marsh area were most likely overesti-

mated due to non-steady flow conditions that existed in the experimental marsh due

to the pumping schedule in operation and other irregularities that existed in the

experimental area.

The computed values may still be used to explain trends in the resistance factor

as illustrated in Figure 5. The n values generally increased during the first phase of

the experiment due to the shift in type and density of the vegetation that existed in

the experimental marsh. During the second phase of the study, the habitat appears

to have reached an equilibrium so that there are only small fluctuations in the value

of n due to short-term variations in climate affecting the vegetation.

Finally the computed n values showed no indication of being a function of the

depth of water as would be expected from theoretical considerations and other

research (Kadlec et al., 1981; Shih and Rahi, 1981). Computed Manning's n as a

function of depth for phase 1 are illustrated in Figure 6. There is some evidence that

Manning's equation may not be the most appropriate method of describing flow

through this type of marsh vegetation (Hammer and Kadlec, 1986). Work currently

in process by Robert Kadlec (personal communication) and others lends support to

the possibility that a more appropriate description of flow resistance in marsh

vegetation may be found.

IV. WATER BUDGET DATA

The period for which sufficient data are available for the Boney Marsh water

budget analysis begins March 26, 1976. Areal distribution of water levels are deter-

mined from a network of stage recorders placed at key locations throughout the

marsh. These stages are measured continuously throughout the day on graphic

recorders and are archived in linear breakpoint form converted to fixed interval

hourly data to compute flow on an hourly basis for the period of record. The names

and locations of these stage recorders appear in Figure 1.

+

+

+

+

+

+ + +

SH ) NN UNG'S

MANNINCGS'N'N

m0 c N -

Ndb

4-+

0~

0a

n

LL

DN

C

UU

CCcno

SQManning' N

Manningin N

- a a * f iFigure b. Manning s ri verus~ pu u vwatci

a4-

-c

~0

3

0

v

1

The mean areal day-end stage was calculated from the stage recorders in each

of the respective areas during phase 1. However, during phase 2, the north end

impoundment and south pump downstream gauges were removed (March 1983 and

January 1984, respectively). Therefore, a statistical analysis was completed to

compute a relationship between the south culvert upstream stage and the average

stage of the eastern marsh for the period when all three recorders were available.

This relationship was then used to estimate the average stage in the eastern marsh

for the period when the north end impoundment and the south pump stage recorders

were removed. In phase 2, the average stage of the eastern area was only used to

estimate seepages to the flow through area since a water budget was not completed

on the eastern area during this phase. The estimated average stages for the western

and eastern areas appear in Appendices A and B, respectively.

The daily rainfall measurements were recorded with a rain gauge located in

the Boney Marsh. .The pan evaporation measurements taken on site proved

unreliable so the record available from S-65C was used instead. Early attempts at

obtaining pan evaporation records without a daily human observer proved

unsuccessful due to a combination of deficiencies inherent in float-driven recorders

and difficulties in providing adequate water level control. .Appendices C and D

contain the daily rainfall and pan evaporation data for the entire study period.

Operation logs for the pumps and weirs were also digitized for use in the model.

Periods of missing data exist due to malfunctioning recorders. Missing rainfall

and pan evaporation data is estimated from nearby recorders and flagged as

estimated in Appendices A and B, respectively. Periods of other types of missing

data are summarized in Table 1. This missing data was filled in using a combination

of regression analysis and best engineering judgment. For longer periods of missing

record (for example, those that occurred in 1982), missing weir height data and stage

data simply had to be chosen to minimize the overall error during a period.

Table 1. Periods of Missing Data*

BeginningRecorder

South CulvertHeadwater

South CulvertTailwater

North WeirHeadwater

North WeirTailwater

n

South Weir

South WeirTailwater

South Weir GateHeight

Date

10/6/76

11/30/84

6/22/76

11/27/77

5/25/82

10/17/85

11/25/79

9/2/81

9/11/82

5/12/85

6/6/85

7/4/76

7/27/82

9/20/83

9/27/83

9/26/76

11/29/84

7/27182

Hour

00

Min.

00

Date

10/27/76

11 16 11/30/84

00

00

01

57

24

01

01

15

00

00

01

48

40

08.

16

6/24/76

3/16/78

6/24/82

11/4/85

1/3/80

9/16/81

9/29/82

6/6/85

6/19/85

8/2/76

10/8/82

9/27/83

10/25/83

10/27/76

11/29/84

10 41 10/7/82

Hour

24

Min.

00

*Missing RF and ET measurements indicated in Tables 3 and 4.

End

12 29

24 00

10 57

However, short-term fluctuations during the period could not be estimated

accurately; therefore, the root mean square error tends to be large for long intervals

of missing record.

V. WATER BUDGET PHASE 1

A. Methodology

Phase 1 of this study was designed to compare the environmental and water

quality effects of reestablishing overdrained marsh areas by flow through the area as

opposed to ponding the area. This period was also used to calibrate the following

hydrological relationships within the water budget model: 1) the weir discharge

coefficient, 2) the pumping coefficient, 3) the evaporation coefficient, and 4) the

seepage coefficient.

The north and south weir structures do not conform to standard specifications

for flow measuring structures and thus have to be calibrated. Unfortunately, flow

conditions near these structures do not lend themselves to direct calibration with

standard flow measuring techniques. The north weir can be calibrated by a water

budget approach given the stage-storage relationship for the canal connecting the

weir with the pump station and the operating characteristics of the pump station.

This is possible because ET and seepage loss are negligible in the canal in

comparison to the flow and because the pulse type mode of operation of the pump

provides an adequate range of head conditions at the weir. This flow equation can

then be applied to other structures in the marsh area which have similar

characteristics.

Likewise, the ET coefficient can be calibrated in the eastern marsh area where

stage fluctuations are mainly due to the difference in ET and rainfall. This

coefficient can then be applied to the entire region.

The seepage function is developed based on head differences across the levees.

This function is assumed to be uniform for all the levees. The rate of seepage per foot

of head across the levees must be determined by calibration.

Both pump stations use Couch axial flow pumps which were calibrated by the

manufacturer based on model studies in their plant. The general form of the pump

curves was verified by the South Florida Water Management District with flow

measurements utilizing a Pitot tube arrangement in the discharge tube of both

pumps after installation. The form of the discharge equation was found but some

uncertainty still remained in the absolute magnitude of discharge. Thus, the

pumping relationships also needed to be calibrated.

Essentially the calibration procedure minimizes the root mean square

differences between the actual change in storage (ASa ) and the simulated change in

storage (ASs) by choosing the optimal value for the coefficients of each hydrologic

process which best simulates the real system. An additional constraint of this

procedure was conservation of mass.

The actual change in storage (ASa) for a given day is estimated from the

average of the stage recorders in a particular area at the beginning (0 hr) and at the

end (24 hr) of that day and the stage-storage curve for the appropriate area.

The simulated change in storage was calculated based on the individual

components of the water budgets for the area of concern. This change in storage can

be expressed by:

ASs = Qin- Qout- Seep- ET + RF

where

ASs = simulated change in storage

Qin = estimated structural inflows

Qout = estimated structural outflows

Seep = net seepage out of area

ET = evapotranspiration

RF = rainfall

(all terms expressed in units of acre-feet)

The discharges over the weirs were based on commonly used flow equations. If

the weir is not submerged, the flow rate is based on the weir height and the upstream

stage above the weir. If the weir is submerged, the downstream stage has to be taken

into consideration in the calculations. The governing equation takes the form

Q = C1 * W * H 115 *[1- (H2/H1)"5]3 8 5

where

Q = calculated discharge [CFS]

C1 = coefficient to be optimized [feet/sec]

W = weir width [feet]

H1 = upstream stage above weir [feet]

H2 = downstream stage above weir [feet]

(= 0 when weir is not submerged)

This equation appears in the Handbook of Hydraulics (King and Brater, 1963).

The pumping discharge equation takes the form of

Q = C2 * FR *[54.56 - 10.91 * SQRT (46.45 - UP)]* RPM/1700

where

Q = calculated discharge [CFS]

UP = upstream stage [feet MSL]

FR = fraction of time pumping

RPM = pump speed [in revolutions per minute]

C2 = coefficient that needs to be optimized for a given pump type

[dimension less units]

The north pump was operated at approximately design discharge for 8-12 hours

per day, 5 days per week, Monday through Friday.

In addition to the coefficients that needed to be optimized for the flow

equations, there were also coefficients associated with evaporation and seepage

rates.

The equation for evaporation is

EVAP = C3 * PAN * Area

where

EVAP = the approximate volume of evapotranspiration [acre-feet]

PAN = pan evaporation [feet]

Area = surface area [square feet]

C3 = coefficient to be optimized [dimensionless units]

A seasonal dependence was not found using calibration data from this study

area.

and the seepage equation is

Seep = Miles * HD * C4

where

Seep = seepage [in CFS]

Miles = length of levee [in miles]

HD = head differential across the levee [in feet]

C4 = coefficient that needs to be optimized [CFS/foot-mile]

Initially the values of C1, C02, C3 and C04 are chosen based on best engineering

judgment. Then the mass balance error and the root mean square error for each area

is calculated on a daily, monthly and yearly basis. The mass balance error is defined

as the sum of the differences between the actual change in storage (ASa) and

simulated change in storage (ASs). Therefore

S= ASa- ASs

where

e = error

The root mean square (RMS) error is calculated by

N

R MS = V4 t e'lN)t=t

where

RMS = root mean square error

E = summation of E2 for N time increments

N = number of days or months over which the error is summed

Statistical tests (Kolmogouro-Smirnof) for the equivalence of sample

distributions indicate that the values of c are approximately normally distributed.

RMS is identical to the standard deviation of the sample set, which is a good

estimate of the standard deviation of the population of possible errors, e, when the

sample size is sufficiently large. When the sample size is small, (N) in the equation

for computation of RMS can be replaced by (N-1) to obtain an unbiased but less

reliable estimate of the population standard deviation. The mean of the set of

sample errors will be shown to be approximately zero which is a good estimate of the

mean of the population of e. This allows use of known properties of the standardized

normal variate to be used to make statistical inferences on the errors associated with

the water budget. In particular, it allows an estimate to be made of the probability

that an error of any magnitude will be exceeded if the value of RMS is known. For

example, the probable error (exceeded 50% of the time) is 0.674 x RMS; the odds

against an error larger than RMS is 2.15 to 1; and the odds against an error larger

than 2.0 x RMS is 20.98 to 1 (Hodgman, 1962).

Once the errors are calculated, the coefficients are adjusted by a systematic

process which minimizes the root mean square error while keeping the coefficients in

an acceptable range. This process is subject to the constraint that the long-term

mass balance error is negligible.

The steps of this process are as follows:

1. Optimize the pumping and discharge coefficients. Optimization is done with

the north pump and north weir because there are large changes in stage in the canal

throughout a given day mainly due to flow through the structures. Rainfall, seepage

and ET are of smaller orders of magnitude.

Stages upstream of the north weir were measured continuously by a standard

stage recorder. Stages were summarized on an hourly basis so that flow through the

north weir could be computed hourly for the period of record. Hourly values were

summed over 24 hours and compared to daily inflow from the pump and to the

observed fluctuations in daily storage. The weir flow coefficient was adjusted until

there was a mass balance over the entire period of record given a pump flow scaling

coefficient. The pump scaling coefficient was then adjusted to minimize the root

mean square error in the daily mass balance equation of the canal. The pumping

and weir flow coefficients for these structures were then applied to other structures

in the Boney Marsh experimental area because they are similar in nature.

.2. Optimize the ET coefficient so that the RMS error is the smallest possible

value. This is accomplished by minimizing the RMS error for the eastern area where

ET has its largest effects relative to the other components of the water budget.

3. Determine the seepage coefficient which best leads to a mass balance and

the lowest overall RMS error.

4. Repeat steps until coefficients stabilize.

The optimized coefficients appear in Table 2. Appendices E, F and G contain

the computed daily discharges for the north weir, south weir and south culvert,

respectively for the first phase of this study. Appendices H and I contain the north

pump and south pump computed volume of daily flow for the same period.

B. Interpretation of Error

There is mass balance for the three-year period to within 1% of the estimated

inflows and outflows. The total error over the 350 acres of land was only -157 acre-

Table 2. Optimized Coefficients

C1 = weir discharge coefficient 3.0 [feet/fsec]

C2 = pumping coefficient .96

C3 = evapotranspiration coefficient .70

C4 = seepage coefficient .06 [CFS/foot-mile]

feet of water. This error is very small when it is considered that over this period

more than 12,000 acre-feet of water flowed through the Boney Marsh experimental

area, ET and rainfall accounted for another three to five thousand acre-feet of water

entering and leaving the area, and there is a seepage function to consider.

The individual budgets of the marsh areas will shed more light on the error

term and on the relative contribution by the separate hydrologic components.

A detailed error analysis for each area can be seen in Tables 3, 4 and 5. In

Table 3 a negative error indicates that ASs is greater than ASa while a positive error

indicates just the opposite.

Table 3. Mass Balance Errors.(acre-feet)

Western Eastern (No-(Flow) Area Flow) Area

1976 72.3 -73.7 -47.7

1977 -65.5 61.4 -76.2

1978 2.2 90.0 -117.0

Total 9.0 77.7 -240.9

i. Canal

The error in the canal is mainly associated with the volume of flows entering

and leaving the canal. ET, rainfall and seepage are much smaller than the

measured inflows and outflows. The total flow passing through the canal for the

Table 4. Daily RMS Errors (acre-feet)

Western Eastern (No-(Flow) Area Flow) Area

1976 3.52 7.35 4.84

1977 3.03 6.05 5.30

1978 2.12 5.92 6.10

Table 5. Monthly RMS Errors (acre-feet)

Western Eastern (No-(Flow) Area Flow) Area

1976 19.13 38.61 42.75

1977 22.38 74.30 69.57

1978 25,81 69.39 62.05

three-year period was about 10,734 acre-feet. This averages out to be about 10.6

acre-feet per day. The average daily RMS error from Table 4 is about 27% of the

actual flow. A noticeable trend illustrates that the RMS error dropped throughout

the study period. During 1978 a total of 3,872 acre-feet of water flowed through the

canal, an average of 10.6 acre-feet a day. Howeyer, the daily RMS error for this year

was only 2.12 acre-feet or only about 20% of the daily flow. This improvement in

results is associated with improved weir height data received as the study period

progressed.

The average monthly flow is about 325 acre-feet. The monthly RMS error aver-

ages about 22 acre-feet, which amounts to about 6.7% of the monthly flow. This

illustrates that most of the daily error compensates itself on a monthly basis.

On a yearly basis the largest mass balance error is 72 acre-feet. This is about

2% of the total flow that passed through the canal during this period. Over the three-

year period, the mass balance error is nearly zero.

ii. Western Area

The error in this area is due to a combination of all the components of the water

budget. The daily RMS error is between 6 and 7 acre-feet over 120 acres. This error

amounts to an error in change of average stage of about a half inch per day. This

daily error is quite small when the error associated with flow estimations are taken

into account. The stages measured at the north and south ends of the reservoir may

not always reflect the average stage in the area. The distribution of water in this

area varies depending on timing and magnitude of inflows that enter the area at the

north weir. Also during periods of low stages the topography of the area becomes

important in the distribution of water in this area. Therefore, a portion of the daily

RMS error can be attributed to the estimation of the actual change in storage rather

than the estimation of the change in storage calculated from the water budget.

Errors in the estimation of the actual daily change in storage would be expected to

cancel each other over long time periods.

The maximum monthly RMS error occurred in 1977. This error of 74.30 acre-

feet is equivalent to about one-half a foot in stage per month. This indicates that

about two-thirds of the daily error compensates itself over a month. The largest

mass balance error for a given year is 90 acre-feet, while the mass balance error for

the three-year period is 77.7 acre-feet. Over the longer periods the errors tend to

compensate themselves indicating that a significant part of the daily RMS error was

likely caused by the estimation of the actual change in storage.

iii. Eastern Area

The daily RMS errors are slightly smaller for the eastern area than the western

area and range between 5 and 6 acre-feet. Over an area of 230 acres, the error

amounts to about a quarter of an inch in depth. The stage variation over the entire

area at a given time varies more than this amount and the error again may be due to

calculations of the actual change in storage rather than the estimated components of

the water budget. The largest monthly RMS value in any year was 70 acre-feet.

This amounts to an error of about 3/10 foot per month, therefore, about half the daily

error compensates itself over a month. After a three-year period, the stage difference

due to this error would be approximately one foot with the total error being 240 acre-

feet over an area of 230 acres.

C. Discussion

A reasonable understanding of the magnitude of all the components of the

Boney Dike experimental marsh water budget have been attained on a daily basis.

Table 6 contains the computed annual water budget of the eastern marsh area, the

western marsh area, and the canal. An interesting aspect of the water budget is that

the net runoff is negative. This will be discussed in more detail in phase 2 and in the

conclusion of the report. This water budget is presented graphically on a monthly

basis in Appendix J. A substantial part of the error appears to be associated with

poor weir height and pump log data. The data improved over the three-year period

in the canal and western areas where RMS errors dropped.substantially. No effort

has been made to more accurately measure the weir at the eastern area.

During the three years, 10,734 acre-feet of water flowed into the canal through

the north pump and 10,676 acre-feet flowed over the north weir. ET, rainfall and

seepage had a negligible effect. Flow into the western area over the north weir was

10,676 acre-feet and 10,175 acre-feet flowed out over the south weir. The difference

in these discharge volumes is due to an excess of evapo-transpiration over rainfall

during this rather dry period. The eastern area had 1,923 acre-feet of inflow through

the south pump and 991 acre-feet outflow through the south culvert. This again was

mainly due more to evapo-transpiration than rainfall during the dry period.

Seepage plays only a minor role in the budget because inward seepage along the

eastern boundary of the marsh is approximately balanced by the outward seepage

along the western boundary. Figure 7 (a-c) illustrates the relative magnitudes of

15.0

14.0

24.3

53.3

334.6

313.6

545.1

1193.3

RF

637.5

597.6

1037.5

2272.6

Table 6. Annual Water Budget (acre-feet)

a. Canal

North NorthPump Weir

18.8 2915.9 2946.9 29.2

24.1 3943.7 3836.4 34.9

22.5 3872.0 3850.1 28.3

65.4 10,731.6 10,633.4 92.4

b. Western Area

North SouthWeir Weir

420.8 2946.9 2708.5 -1.5

539.9 3836.4 3563.6 3.3

506.6 3850.1 3906.0 5.8

1467.3 10,633.4 10,178.1 7.6

c. Eastern Area

ET

801.7

1029.5

965.52796.7

SouthPump

608.7

835.5

483.7

1927.9

SouthCulvert

241.9-

309.5

445.9

997.3

Seepage

66.7

86.6

77.2

230.5

Year

1976

1977

1978

Total

Runoff

-300.1

-439.4

39.4

-700.1

the different components of the water budget of the Boney Marsh.

VI. WATER BUDGET PHASE 2

A. Methodology

In phase 2 of this analysis, hydrologic relationships calibrated in phase 1 are

used to determine the water budget of the western area of Boney Marsh for the

period from March 1, 1979 through February 1986. The validity of using these

relationships is tested by comparing the change in storage calculated from the water

Runoff

60.2

-72.4

6.4

-5.8

Runoff

-239.9

-269.5

61.7

-447.7

Year

1976

1977

1978

Total

Year

1976

1977

1978

Total

Phase I - Canal Inflow

Rainfall (04 )

North Pump COlahorge (99.51)

Phase I - Canal Outflow

Nworth We a (O-)

ll W B d et Pha se 1)

Figure 7a. Overai atr ate.u g.r nal

Phase I - Western Area Inflow

.,,, t,, nI a.ZmIuru l r NSF wl sW G

Phase I - Western Area Outflow

-. ~~- -- - t U Aa..f.A~4f ke 11

SeepagO

(87.3x)

igure /. uveratl vvatr u yt\r a:: ,/

Phase I - Eastern Area Inflow

Rainfall (54.1% )

Phase I - Eastern Area Outflow

seep"ge (8.7%)

ET (9o.1

Figure ic. uverai waer Duager ~nIrr , ,

South Pump (45.9X)

Cuivert (24.8)

budget approach (ASs) to those estimated from the appropriate stage recorders (ASa).

The ASa is determined from the difference in'average stage for the marsh area at the

beginning (0:00 hr) and the end (24:00 hr) of the day, and the stage-storage curves

developed for the area. The ASs is calculated as follows:

ASs = Qin - Qout - Seep - ET + RF

where

ASs = simulated change in storage

Qin = inflow

Qout = outflow

Seep = seepage

ET = evapotranspiration

RF = rainfall

(all quantities expressed in acre-feet)

The different components of the water budget are computed with the

relationships derived in phase 1. Computed discharges for the north weir and south

weir appear in Appendices K and L.

The estimated mass balance error of the water budget is defined as the

difference between the actual change in storage (ASa) and the simulated change in

storage (ASs),

therefore,

e= ASa- ASs

where

c = volume of error.

The root mean square error is calculated by:

RMS = 4 eeN)i=1

where

E = summation of e2 for N time increments

RMS = root mean square error

N = number of days or months error is summed over

The value of e along with the root mean square error is used to verify the

seepage, ET and discharge coefficients derived in phase 1. It was shown in phase 1

that the errors,e, are normally distributed with a mean of zero and a standard

deviation of RMS. Therefore, the expected value of the error is 0.670 x RMS and the

probability of an error of any magnitude can be found from published tables of the

standardized normal variate. These error estimates were also used in checking the

input data.

B. Interpretation of Error

Table 7 includes an error analysis summary. The daily RMS errors of the

water budget vary between 3.37 and 6.39 acre-feet for the western marsh area. This

is equivalent to an error in the computed average stage of about .5 inch per day. The

RMS error is quite small compared to the magnitudes of the flows leaving and

entering the area. The daily RMS errors calculated in phase 2 are generally smaller

than those calculated in phase 1 which varied between 5.92 and 7.35 acre-feet for the

western marsh area. This reduction of the RMS error is most likely attributed to a

recorder that was installed on the south weir to measure weir elevations rather than

relying on unreliable manual readings. As explained in phase 1, part of the

computed error is associated with the estimation of the actual change in the storage

calculated from the stage recorders with the aid of the stage-storage curves and is

not associated with the estimations of the water budget. Due to the variation in the

distribution of water within the area which depends on the timing and magnitudes of

the inflows and outflows, the two gauge average is not always completely

representative of the actual storage changes.

Table 7. Annual Error Analysis

MassYear Balance

[acre-feet]

DailyRMSError

[acre-feet]

1979* -115 3.47

1980 + 63 3.96

1981* -213 4.90

1982 -162 6.08

1983 + 216 5.34

1984 + 243 5.22

1985 +139 6.39

1986** -20 2.67

Mean*Includes only March to December.

**Includes only January and February.

% ofMean

Daily Flow

53

66

81

71

70

86

41

67

MonthlyRMSError

[acre-feet]

33.60

28.16

44.11

35.09

34.16

54.03

44.79

10.13

The maximum monthly RMS error of 54 acre-feet occurred in 1984. This error

is equivalent to less than .5 foot in stage per month. The largest mass balance error

for a given year was 243 acre-feet. This is less than 10% of the flow through the

marsh area during that particular year. The mean RMS error as a percentage of

mean outflow decreases with increasing time period. The respective daily, monthly

and annual percentages are 67%, 16% and 7%. The flow traveling through the area

is the overwhelming element in the yearly budget and thus provides a general idea

(though probably high) of the error associated with the flow values. Table 8

illustrates the ratio of the annual error to that of the flow through the marsh area.

Over the seven-year study period the mass balance error was approximately 200

acre-feet compared to nearly 20,000 acre-feet that flowed through the marsh. This

0.1% error is acceptably close to zero.

% ofMean

MonthlyFlow

12

19

15

15

24

20

10

16

[

Table 8. Ratio of Error to Volume of Flow (acre-feet)

Year ErrorCompFlow

of the

1979* -115

1980 + 63

1981 -213

1982 -162

1983 +316

1984 + 243

1985 +139

1986** -20

Sum +151 1

Mean 22*Includes only March to December.

**Includes only January and February.

C. Discussion

Reasonable estimations of the components of the Boney Marsh flow through

area water budget were updated through February 1986. In most cases, inflows and

outflows through the structures were much larger than the components of the water

budget associated with rainfall, evapotranspiration and seepage. The relative

magnitude of the different components of the overall water budget are illustrated in

Figure 8. Flow over the north weir accounted for 87% of the inflow, while rainfall

accounted for the remainder of the inflow. 84% of the volume of water that left the

area did so in the form of discharge over the south weir, while another 15% left in the

form of evapotranspiration. Only 1% of the outflow was in the form of seepage. The

volume of 19,746 acre-feet entered the area over the north weir during the study

period, while 19,085 acre-feet left over the south weir. The difference between these

two numbers was largely due to the effects of rainfall, ET, and seepage. A smaller

utedOutArea

2330

2508

1872

3191

3151

2842

2632

559

9,085

2,726

Ratio

-0.04

+ 0.02

-0.09

-0.05

+ 0.07

+ 0.09

+ 0.05

-0.03

Phase II - Western Area Inflow

Mhare (57.oZ)

Phase II - Western Area Outflow

(54.09)

Figure U. Uverali water nuagetr rnisw Z

See..p (1.0

portion is due to the mass balance error which was 200 acre-feet. The error of

computations associated with the annual water budget was less than 10% of the

flows entering or leaving the area. Table 9 summarizes the annual water budget for

the western marsh area during phase 2.

Table 9. Annual Water Budget (acre-feet)

North South RunoffYear Weir Weir RF ET Seep. ASa (AF)

1979* 2,690 2,330 283 441 58 31.4 -302

1980 2,720 2,508 326 527 63 2.6 -149

1981 2,365 1,872 301 497 87 0.0 -406

1982 3,202 3,191 606 484 38 6.6 + 27

1983 3.007 3,151 454 481 26 19.7 + 170

1984 2,561 2,842 465 422 20 -46.7 +301

1985 2,654 2,632 388 481 9 21.5 -13

1986** 547 559 30 46 -13 -29.5 -1

Total 19,746 19,085 2,851 3,378 300 5.6 -361*Includes March through December only.

**Includes January through February only.NOTE: These values can be expressed in inches over the area by dividing by 10.0.

The monthly water budget appears in Appendix M. The monthly error terms

associated with the water budget normally range between 10 and 20 percent of the

monthly flow. However, during low flow months, or months with poor or missing

data, the relative importance of the error in the water budget may be larger.

An interesting finding of this study was that the net runoff was negative. Unit

runoff is normally defined as the amount of surplus rainfall which leaves a

watershed in the form of liquid water. It is usually expressed in units of inches per

year. Since the time periods are large, changes in storage are considered negligible.

Depending on the type of information available, it is computed either as 1) water

flowing out of an area minus water flowing into the area plus the net seepage out of

the area (if the boundaries of the area do not lie on the ground water divide), or as

2) rainfall-evapotranspiration. By method 1) the unit runoff for the period of record

is -5.2 inches/year; by method 2) the unit runoff is -7.5 inches/year. The differences

between methods of calculations arise from the net change in storage over the seven-

year time period and the residual error in the water budget. In either case, the unit

runoff is negative indicating that more water is consumed than is supplied by

rainfall. This is likely to occur if water levels are maintained so that natural

vegetation in this type of marsh is given access to an unlimited supply of water,

particularly when a traditional regulation schedule is enforced. In addition, the

water budgets for both the flow-through area and the nonflow-through area had net

negative runoff for the period 1976 through 1979. These negative runoff values

contrast sharply with unit runoff values typical for areas within the District which

are subject to wet/dry cycles on upland vegetation. Unit runoff values are typically

in the range of 12-15 inches. Table 10 illustrates some of the unit runoff values

determined in earlier studies. These values were computed from the inflow and

outflow from these watersheds. Also included in the table are values from Map

Series 32 (Visher and Hughes). This map depicts the difference between rainfall and

potential evapotranspiration in Florida. The values represent an approximation of

the minimum amount of runoff that may be expected for a region based on climatic

conditions only without consideration for local drainage characteristics.

The anomaly in the general rainfall patterns along the Kissimmee River or the

recent dry period in this region may contribute to the negative runoff conditions.

There is an apparent shadow effect in annual rainfall totals in the lower Kissimmee

River basin which is downwind of the cool stable air of Lake Okeechobee when the

prevailing southeasterly winds are dominating in south Florida. This rainfall

anomaly is illustrated in Figure 9. The below average rainfall totals of recent years

appear in Figure 10. However, as illustrated in Table 10, the yearly net runoff

Table 10. Typical Unit Runoff from South Florida

Unit Runoff(inches)

Study Area Compute

IndianPrairie Area

St. Lucie CountyArea

EvergladesAgricultural Area

CalooshatcheeRiver Basin Area

Martin CountyArea

Upper TaylorCreek,OkeechobeeCounty

Indian RiverFarms DrainageDistrict, IndianRiver County

Monreve Ranch,Martin County

Upper KissimmeeRiver Basin

Lower KissimmeeRiver Basin (C-38)

MapSeries#32

Source for Comouted Runoff

3 3 Memorandum Report on Surface WaterAvailability in Lake Istokpoga-lndian Prairie,July 1974, R.L. Mierau.

16 12 Memorandum Report on Surface WaterAvailability in the St. Lucie Area, July 1974,R.L. Mierau, W.V. Storch.

16 9 Memorandum Report on Surface WaterAvailability in the Calooshatchee, Sept. 1974,R.L. Mierau, R.E. Irons, W.V. Storch.

13 0 Same as above.

14 12 Rainfall Drought Frequency and Availabilityof Surface Water in Martin County, Nov. 1985,A. Fan.

13 7 Annual Report (1971), Agricultural ResearchService, H.P. Wade, W.H. Speir, J.C. Stephens,E.H. Stewart.

15 11 Same as above.

16 12 Same as above.

10 5 Based on historical records at S-65.

15 5. Based on historical records at S-65 and S-65E.

estimates for the lower Kissimmee River basins are positive, even during drier than

normal years. Therefore, although the abnormally low rainfall conditions of recent

years enhance the net negative runoff totals, it must also be recognized that the

management practice of maintaining water levels in the marsh areas will greatly

I - -

60 WESTPALM BEACH

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increase evapotranspiration losses from the watershed, particularly during dry

years. A net positive value for runoff can be expected when water levels are allowed

to fluctuate normally even during extremely dry years. The timing of rainfall events

is such that even during the driest of years, there is some time during the year when

rainfall rates exceed the capacity of local storage to trap excess water. The excess

water then leaves the area as runoff. Evapotranspiration rates decline unless

supplemental water is added to compensate for the water lost to runoff.

Estimated evapotranspiration values for this marsh area averaged about 48

inches per year. This value is slightly less than the value calculated for marsh areas

in the South Florida Water Management Model Documentation report (MacVicar,

VanLent, Castro, 1984) when sufficient water is available. In another study,

"Evapotranspiration Patterns in Florida" (Dohrenwend, 1977), a map of potential

evapotranspiration patterns in Florida was presented. The potential

evapotranspiration in this report was defined as "the theoretical quantity of water

which would be given up. to the atmosphere within a zonal climate and upon a zonal

soil by the natural vegetation of the area, if sufficient but not excessive water were

available throughout the growing season." This definition is very similar to the

condition that existed in the Boney Marsh experimental area during this study

period. The estimated potential evapotranspiration from this study and from the

latest calibration of the South Florida Water Management model for the marsh

areas that exist in the water conservation areas (personal communication with E.R.

Santee, 1987) agree very closely with the values estimated by Dohrenwend.

Dohrenwend also predicted that potential evapotranspiration values for the Water

Conservation Areas would be higher than those for the Boney Marsh area based on

temperature data from the two areas.

It is expected that the unit runoff values should be applicable to other areas

within the Kissimmee River flood plain if and when these areas are subjected to

flow-through or raised pool elevations. These areas then would, too, become

consumptive use areas during normal and dry rainfall periods. The pan evaporation

coefficients may be a more applicable method of transferring this data to ungauged

areas with similar vegetation and water conditions if the rainfall conditions are

significantly different.

VII. CONCLUSION

Portions of the Kissimmee River floodplain will likely become a net

consumptive water use area rather than a runoff generating region if they are

maintained at raised pool conditions. This was demonstrated for restored marsh

environments subjected to flow-through conditions similar to those which might be

expected from dechannelization of the Kissimmee River. Phase 1 studies provided

some evidence that this would also be the case for marsh restoration options such as

regulated pool fluctuations.

Extrapolating the results of this study to marsh restoration options for water

quality improvement such as detention and retention areas on similar vegetation

type indicates that increased consumptive use of water should be taken into account

in computing the overall impacts of these alternatives. While the absolute

magnitude of the increased consumptive use will vary depending on local site

conditions such as intensity of drainage prior to modification, rainfall conditions,

and.specific design of modifications, the magnitude of these increases is likely to be

quite substantial.

The technique of presenting a summary of residual errors in a format

compatible with standard textbook statistical distributions provides valuable

insight into the source of the error terms and the relationship between reliability of

the data with increasing time resolution.

There is a tendency toward decreasing the time steps for modeling projects in

an effort to provide more detail in the results. Several decades ago the majority of

work was concentrated on yearly time intervals. This was decreased to monthly

intervals about 20 years ago. Current efforts are tending toward daily, hourly, or

even finer time steps. There has been some concern during the last decade that these

reduced time steps may not be justified without increasing the density of the

monitoring network used to calibrate and/or drive the models. This point was clearly

demonstrated for the case of a water budget analysis with a monitoring network

density consistent with normal practice in studies of this type. Errors increased

dramatically with decreasing time steps. Expected errors on a yearly basis were

very good. These errors increased to marginally acceptable values on a monthly

basis. On a daily basis the expected error was so large that the data could not be

reliably used for many purposes.

Analysis of the variation in errors indicated that a substantial portion of the

daily error term could be attributed to an inability to adequately describe storage

changes. This translates to insufficient water level monitoring density.

Undoubtedly areal distribution of rainfall and the inability of potential evaporation

(as indexed by pan evaporation) to account for all variations in actual evapo-

transpiration on a daily basis had some effect on the error terms. The effect of

spatial rainfall distribution and the expected deviation of evapotranspiration from

potential evaporation over short time periods could not be evaluated with the

existing monitoring network but the combined effect is not expected to be larger

than 50% of the expected daily error.

Flow in and out of the flow-through area was computed using a standard

equation for sharp-crested weirs as presented by King and Brater, 1963. Corrections

for tailwater submergence were based on results by Villemonte, also presented by

the above reference. A constant discharge coefficient of 3.0 was judged adequate by

the calibration procedure used. The computed flows during the calibration period

were further confirmed by a chloride budget analysis by Davis, 1981.

Rainfall was measured on site by a recording raingauge.

Evapotranspiration was computed by multiplying class A pan evaporation at S-

65C, which is located approximately 10 miles southeast of the study site, by a

constant coefficient of 0.70. The coefficient was developed through a calibration

procedure described in the text. This procedure was judged adequate for yearly and

monthly time scales. A constant coefficient on a monthly basis implies that climatic

conditions, as represented by pan evaporation, are adequate to describe potential

evapotranspiration from South Florida marshes without considering vegetation

effects such as seasonal dormancy. There is evidence by other investigators that a

constant coefficient applied to pan evaporation does not adequately describe

potential evapotranspiration on a daily or shorter basis. This could not be verified in

this study due to the large expected error in daily water balance. The procedure

developed in this study should be transferable to similar vegetation subjected to an

unlimited supply of water on a monthly or yearly basis.

Seepage was computed as 0.06 times the head difference across the levee times

the number of miles of levee over which this head acts. The coefficient of 0.06 was

obtained by the calibration procedure conducted during phase 1. It appears to

represent seepage quite well at this location. The coefficient may not be readily

transferable as it represents an average of soil conditions which vary quite abruptly

in the upper soil layers as a result of soil profile formation in a floodplain developed

from a meandering river.

BIBLIOGRAPHY

Davis, S.M. 1981. Mineral Flux in the Boney Marsh, Kissimmee River. South

Florida Water Management District, Tech Publication 81-1.

Dohrenwend, R.E. 1977. Evapotranspiration Patterns in Florida. Florida Scientist

40:184-192.

Fan, A. 1985. Rainfall Drought Frequency and Availability of Surface

Water in Martin County. South Florida Water Management District, Tech

Memorandum. November 1985.

Hammer, D.E. and Kadlec, R.H. 1986. A Model for Wetland Surface Water

Dynamics. Water Resources Research 22,13:1951-1958.

Hodgman, C.D. 1962. Mathematical Tables from Handbook of Chemistry and

Physics, Chemical Rubber Publishing Co.

Kadlec, R.H., Hammer, D.E., Nam, I.S., Wilkes, J.O. 1981. The Hydrology of

Overland Flow in Wetlands. Chem. Eng. Commun. 9:331-334.

King and Brater. 1963. Handbook of Hydraulics. McGraw-Hill, New York.

Koeppen, W. 1931. Grundriss der Klimakunde. Walter de Gruyter Company,

Berlin, Germany.

Lin, S.T., and S.F. Shih. 1979. Modified Water Quantity Receiving Model for

Florida Conservation Areas. Water Resources Bulletin 15:155-168.

MacVicar, T. 1981. Frequency Analysis of Rainfall Maximums for Central and

South Florida. South Florida Water Management District Tech. Publication

81-3.

MacVicar, T., T. VanLent and A. Castro. 1984. South Florida Water Management

Documentation Report. South Florida Water Management District Tech.

Publication 84-3.

Mierau, R.L. 1974. Memorandum Report on Surface Water Availability in Lake

Istokpoga, Indian Prairie. South Florida Water Management District, Tech

Memorandum. July 1974.

Mierau, R.L. and W.V. Storch. 1974. Memorandum Report on Surface Water

Availability in the St. Lucie Area. South Florida Water Management District,

Tech Memorandum. July 1974.

Mierau, R.L., R.E. Irons, and W.V. Storch. 1974. Surface Water Availability in the

Calooshatchee. South Florida Water Management District, Tech

Memorandum. September 1974.

Neidrauer, C.J. and Cooper, R.M. In publication. A Two-Year Field Test of the

Rainfall Plan. (South Florida Water Management District, technical

publication in press.)

Rosen, M. 1974. Memorandum. South Florida Water Management District.

Sculley, S. 1986. Frequency Analysis of South Florida Water Management District

.Rainfall. South Florida Water Management District Tech. Publication 86-6.

Shih, S.F. and Rahi, G.S. 1981. Seasonal Variations of Manning's Roughness

Coefficient in a Subtropical Marsh. Transactions of the ASAE 25,1:116-119.

Trimble, P. and R.L. Mierau. 1980. Memorandum Report on the Boney Marsh

Water Budget. South Florida Water Management District, Tech

Memorandum. July 1980.

Visher, F.N. and G.H. Hughes. 1969. Interior Geological Survey Map Series 32.

Bureau of Geology, Florida Dept. Nat. Resources, Tallahassee, Florida.

Wade, H.D., W.H. Speir, J.C. Stephens, and E.H. Stewart. Determining the Water

Balance from Climatic Data for Small Agricultural Watersheds in Peninsular

Florida - Fla PL-25. In Annual Report U.S.D.A. Agricultural Research Service.

Page 39.

APPENDIX A

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APPENDIX J

Eastern Marsh Water Budget for 1976inflow

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Z South Pump 0 Z Rainfall

Outflow

-

dn.-. __ _

J I I

Jan Feb Mar Apr May - Jun Aug Sep Oct Nov Dec

= South Culvert Q

400 -

200 -

100

0

600

500

300

100

0

®M Seepage

J-1

EIET

-

• , I I , I" I ! )T I I I I I I'

"'

E2 5I T I II' /

Eastern Marsh Water Budget for 1977Inflow

H; \ L1 I I J I I I i I I I

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

South Pump Q ®I Rainfall

Outflow

SI I I M a I i I i I

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

[r South Culvert Q [® Seepage ® ET

J-2

300

100

0

r I 7, l 1 I. I . s' " ' ' -L '~r~n~

Eastern Marsh Water Budget for 1978inflow

500 -

400 -

300

200

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

= South Pump Q

Outflow

400 -

JaI Feb Mr Ar

Jd Feb Mar AprIy I 1 1 I

May dun dul Aug Sep Oct Nov Dec

0 South Culvert 0

® Rainfall

100 -

=7N

K

Seepage

J-3

- ET

'0

l

Western Marsh Water Budget for 1976Inflow

-N-- -N-

t--- J

Jan Feb Mar Apr M4y Jun Jul Aug Sep Oct Nov Dec

] North Welt Q ® Rainfall

Outflow

Jan Feb Mar Apr May - Jun Jul Aug Sep Oct Nov Dec

I South Welr Q ® Seepage = ET

J-4

-N-- = -a --

600 -

500 -

300 -

200 -

400

200

I

I7 ; .I -- S I L B

Western Marsh Water Budget for 1977inflow

<S \\

L

J r I a I r I S I N D

Jon Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

K' K K

S North Weir Q Rainfall

Outflow

\ /'

K' j

N N~

'S1

Nj K~.KN

KS_..

N

K

K

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

EW South Weir Q Seepage Z ET

J-5

500500o

300 -

1 O -

K'

700 -

600 -

500 -

K'

KU

19

,,,4EI1

U

IXm

i

i

III0

i- ' '- ' ' - I L L _ II m - 1 - ' 1--~ -1 ,

Western Marsh Water Budget for 1978Inflow

N K,

500 -

Ki

U 7i

I I I I M l l I

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

S North Weir Q S Rainfoll

Outflow

N

KK

NAN> n>Y

N

Jan Feb Mar Apr May I

Jon Feb Mar Apr May Jun Jul Aug

I

'1

Kii

Sep Oct Nov Dec

Sep Oct Nov Dec

0 South Weir Q

K

400 -

300 -

200 -

N

400 -

300 -

100 -

0

® Seepage

3-6

I ~ ~_ ~_ __~_~__~__

I \

- ET

1

6001 Jl

NU 'j

'J

IIy

\Vl

i~1

4

i

~ YI I l 1I

Western Marsh Water Budget for 1979

Inflow450 ----

- _

Jan Feb Mar Apr . May Jun Jul Aug Sep Oct Nov Deo

North Weir 0 Rainfall

Outflow

J-7

400

350

300

250

200

150

100

50

0

I

eEo

450

400

350

300

250

200

150

100

50

0Jaon Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

] South Weir Q Seepage ET

Western Marsh Water Budget for 1980Inflow

450 - - - --

400-

350

300

250

200

150

100

50

0Jan Feb Mar Apr , May Jun Jul Aug Sep Oct Nov Dec

jl North Weir Q [7 Rainfall

Outflow450-- --

400 -4

350

300

250

200

150

100

50

0Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

[ South Weir 0Q Seepage El

J-8

I

Western Marsh Water Budget for 1981

Inflow

A.

Jan Feb Mar

= North Weir Q

-A- -A-a i IA

May Jun Jul Aug

-A-; -A- --- -r

Sep Oct Nov Dec

7 Rainfall

Outflow

K\ S\Jn F r Apr May Jun Jul Aug S

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

S South Weir Q ®Seepage

J-9

50 -

0

' -

Q

0E0

300 -

250 -

200 -

150 -

100

K

J L-.1 1 i II I I

-

i

n1_

JJJJI

t[i

I I

Western Marsh Water Budget for 1982

Inflow

Jan Feb Mar

\ North Weir Q

-A-- -N- -N-S I 1i I I I

Apr . May Jun Jul Aug Sep Oct Nov

-T

® Rainfall

Outflow

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Jon Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

= South Weir Q ®j SeepageJ-10

450 --

400 -

350 -

300 -

n=*

200 -

150 -

100 -

50

f -

450-

400

350

300

250

200

150

7

V

l L.~ I~r U ,-+- I

250

v

-

9E

\\

~fi~fi~ i? Er i

450

400 -

350 -

300

0250 -

200 -E

> 150 -

100 -

50 -

n.

450 -

400 -

350 -

300 -

S250 -

* " 200 -E

150 -

100 -

50 -

n-

Western Marsh Water Budget for 1983inflow

77

\\

>+

V

K

V! -

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

I I North Weir Q IZZI Rainfall

7

\

Outflow

7\

+

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

South Weir 0Q J Seepage ETJ-11

V. L

KNAI

&

V

V

~ "-~---~

L

h

i

I

77,

. .... . . i l

e$

y=

I I I h " •

Western Marsh Water Budget for 1984

Inflow

150

100

50

Jan Feb Mar

J~- North Weir Q

Apr May

I2

j Rainfall

Outflow

Jan Feb I I I Jun Jul Aug I Sep Oct N

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

I0 South Weir Q J-2 seepageJ-12

tN

N

450

400 -

350 -

300 -0

Pl

aw0

200 -

150 -

100

50 -

N

t

F 4 I

I

1

" -i

i

I

fi

KL

Ii

i

Jun Jul Aug Sep Oct Nov Dec

i i

~5~B

Y0 1 -1 1 = i

Western Marsh Water Budget for 1985

Inflow

YV

"ldan Feb Mar Apr May Jun

MI

Jul Aug Sep Oct Nov Dec

[ J North Weir 0

Outflow

\1.I~ it1Jan Feb Mar

0j South Weir 0

--

N L

7\

Apr May Jun Jul Aug

-13 SeepageJ-13

'N

.LziL 1h

Sep Oct Nov Dec

250

200

150

100

50

u

oE

o

S>

300

250

200

150

100

50

0

I I--

i

1JJI I i

s

~7f

i

I

L

II

11

1 I

-

n

J"

i s I I B.

= Rainfall

Western Marsh Water Budget for 1986Inflow

450 ---

400

350a

300 -250

200

150

100

50

0 JJon

I d I I |

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

[® Rainfall= North Weir Q

450

400 -

350 -

300 -

250 -

- 200 -

150 -

100 -

50 -

Outflow

I I I I I

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

= South Weir Q J-14 Z Seepage5-14

n

[51ET

I i

L

'I

I ----- ----- -- d E I I Z