Dam Volume Calculator 01

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m3

kL

ML

On this worksheet and all that follow, cells are colour coded:

Green cells denote a required input.

Violet cells require you to select an input from a drop-down menu

Gold cells display an intermediate result.

Yellow cells display the calculated volume of stored water.

You may also see warning or error messages in a grey rectangle:

First choose the units for reporting dam volume m3

Worksheet operation

Dam Water Volume Calculator

prepared by Martyn Keen and Paul Raper

Warning: With all dams, the closer the dam is to full, the more accurately volumes can be

here. As water levels diminish, it is more difficult to accurately determine stored water vol

volumes are often over estimated. If calculated stored water is close to budgeted requirem

volume confirmed by accurate survey.

Warning messages are blue.

Error messages are red.

The volume of water stored in a dam can be determined using this series of worksheets. These wfor gully, circular, rectangular and square dam shapes. Each worksheet can calculate for full or p

For circular, rectangular and square dams, the formulae uses a default inside wall side slope of 3:

of dam length to width is usually 3:2, however the formula will calculated volumes based on anyvariations in side slope are encountered, please contact Martyn Keen on 9780 6269 at the Depart

Bunbury. If you have problems operating the spreadsheet, e.g. macros won't run, contact Paul R

One cubic metre (m3

) equals one kilolitre (kL)One thousand kilolitres (kL) equals one megalitre (ML).

Therefore, one thousand cubic metres (m3) equals one megalitre (ML).


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1. Choose dam shape from drop down list then proceed to the appropriate worksheet

2.

Results for the chosen dam shape will be reported on the Summary page for printing

3. The Reporting page can be printed for your records or faxed to DAFWA if you have prob

The worksheets with contain information used in other sheets & are

Gully

Circular

Rectangular

Square

pale blue tabs

After you have calculated the stored volume of water you can estimate

evaporation losses on the Dam Evaporation worksheet - yellow tab.

Copyright Western Australian Agriculture Authority, 2011. The Chief Executive Officer of the Departof Agriculture and Food and the State of Western Australia accept no liability whatsoever by reason

negligence or otherwise arising from the use or release of this information or any part of it.


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determined by the methods used

mes. In this case, stored water

nts, it is advisable to have the

orksheets calculate water volumeart full dams.

:1. For rectangular dams, the ratio

length to width ratio. Ifment of Agriculture and Food,

aper on 9780 6295.


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Gully

ems.

locked.

mentf


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Volumes (V) of circular excavated tanks (3:1 side slopes)

Formula used for determining a constructed dams storage capacity:

For calculating the underwater floor dimension (r):

where:

d = depth of water(m)

R = radius of water surface (m)

=Pi or 227 or 3.14159

r = radius of floor (m) 0

Potential ERROR; dimensions inconsistent.

0

Volume 0.0 m3

Combination of water depth & radius

produce an improbable floor radius

2 2( )3

dV R Rr r

3r R d


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Volumes (V) of rectangular excavated tanks (3:1 side slopes)

For calculating the underwater floor dimensions (l and w ):

where:

d = depth of water (m)L = length of water surface (m)

l = length of floor (m) 0

W = width of water surface (m)

w = width of floor (m) 0.00


0

Volume 0.0 m3

Combination of water surface

dimensions & depth produce an

improbable floor width.


6l L d

6w W d

( ) ( ) [( ) ( )]6

[ ]d

V L W l w L l W w


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where:

d = depth of water (m)

L = top length of water surface (m)

l = floor length (m) 0

For calculating the underwater floor dimension (l):


0

Volume 0.0 m3

Volumes (V) of square excavated tanks (3:1 side slopes)

Combination of water surface dimensions &

depth produce an improbable floor width.

2 2[ ( ) ]3

dV L L l l

(6 )l L d


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Y

N

Is gully wall constructed from material excavated from gully floor upstream of the embankment? N

Volume (V) of gully dams in m3

Volume (V) of gully dam wall in m3

Gully dam wall

Gully dam

0.5

0.8

1

1.2

1.6 Gully dam wall cross-section

Wall volume of gully embankment

where:

Volume impounded by gully embankment (V) C = crest width (m)

E = length of embankment

G = width of gully stream

Note: G may be ZERO i f g

where: H = height of wall (m)d = depth of water (m) Z = slope of wall, average

k = gully cross section coefficient

L = length (reach) of water surface upstream (m) Enter Z or calculate from u

W = width of water surface across gully (m)

Enter Z

If calculatingZ, measure s

Upstream wall s

Volume V1 0.00 m Downstream wa

0 Calculated Z

Total Volume 0 m3

Shape coefficients

for gully floor

Choose the

appropriate

coefficient (k) from

the drop down list

based on the gully

cross section as

shown at left.

Gully Dams

0.22V k W d L

If the fill used to construct the embankment was excavated from the gully floor upstream of the embankment, there may be an a dditional capacityThis additional capacity can be determined by calculating the volume of the embankment. This volume is added to the volume of the dam already

volume.

(3 2 ) ( )2

3 4

C H Z E GV


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Volume of water stored in your Gully dam. 0 m3

Choose the closest site for evaporation data: click button for appropriate map to see enlargement

Select site from alphabetical drop down listec ay

Choose closest date to day dam water measured. #N/A 0Estimate date for break of next season. #N/A 0

#N/A

Estimated evaporation for the period (depth): #N/A mm

Estimated evaporation from dam (volume): #N/A m3 #N/A

Estimated volume of water or deficiency (-). #N/A m3

1. Determine gully shape coefficient where water is stored. End date must be after start date

2. As water depth diminishes in a gully dam, reconfirm gully shape coefficient and adjust if necessary

If you haven't done a farm water budget, or want access to other dry season resources, use the link below,

Note: estimated evaporation assumes no water drawn

from the dam over the period.

Evaporation Estimation

http://www.agric.wa.gov.au/PC_94136.html?s=746248592
http://www.agric.wa.gov.au/PC_94136.html?s=746248592http://www.agric.wa.gov.au/PC_94136.html?s=746248592


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Name:

Phone:

Fax:

email:

Locality:

Date:

d 0

R Not a required input r Not a calculated output

L 0 l Not a calculated output

W 0 w Not a calculated output

C 0

E 0

G 0

H 0

Z 0.00

k 0.0

Stored Volume: 0 m3

Site: 0

Period: 00-Jan to 00-Jan

Evaporation for period: #N/A mm

Available water: #N/A m3

For queries:

Telephone Martyn Keen: 9780 6269

Fax: 9780 6136

Warning: G omitted, please enter zero or

measured length

Dam Water Volume Calculator - Summary

Inputs for calculating the water stored in a Gully dam Calculated dimensions & error messages


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Note: only sites marked with maroon squares are available, choose a site with similar ev

(orange contours), not necessarily the closest.


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Documents

Dam Volume Calculator 01