Restoring Migratory Fish Habitat Dam Safety Considerations

8/11/2019 Restoring Migratory Fish Habitat Dam Safety Considerations

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NYS Department of Environmental Conservation

by John Stawski

NYS Dam Safety Permit RequirementsNYS Dam Safety Permit Requirements

Basic components of a Dam and how they functionBasic components of a Dam and how they function

To Have a better Understanding of:To Have a better Understanding of:

The decision making process involved inThe decision making process involved in

Dam Removals and Aquatic Passage at DamsDam Removals and Aquatic Passage at Dams

Restoring Migratory Fish HabitatRestoring Migratory Fish Habitat

Dam Safety ConsiderationsDam Safety Considerations

Workshop ObjectiveWorkshop Objective


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Is Dam Removal an Option?Is Dam Removal an Option?

Issues to Consider:Issues to Consider:

-- EcologicalEcological

-- EconomicEconomic

-- SocialSocial

-- Technical/EngineeringTechnical/Engineering TodaysTodays

FocusFocus


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Is Dam Removal an Option?Is Dam Removal an Option?

Issue Considered:Issue Considered:-- Technical/EngineeringTechnical/Engineering

-- Feasibility of Repairing andFeasibility of Repairing andMaintaining a DamMaintaining a Dam

-- Feasibility and Design ofFeasibility and Design of

Dam RemovalDam Removal

-- Feasibility of providing Aquatic PassageFeasibility of providing Aquatic Passage

over or around the Damover or around the Dam

FocusFocus


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Common Dam Types in the Hudson ValleyEmbankment DamsEmbankment Dams

Earthen Embankment Dams aremade up of compacted earth usuallyobtained from a source near the

dam.The dam sides are banked toprovide a stable slope.

They are permeable and are

sometimes constructed in zoneswith a concrete or clay core.

Concrete and MasonryConcrete and Masonry

gravity damsgravity dams

They rely on their own weight tohold them in place and are referredto as gravity dams

Masonry and concrete are moreor less impermeable.


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EXAMPLE DAMEXAMPLE DAM


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Avoid DamAvoid Dam

Modify DamModify Dam

PassagePassage

StrategyStrategyDam SafetyDam Safety

Concern?Concern?

YesYes

MaybeMaybe

FocusFocus

-- Feasibility of providing Aquatic PassageFeasibility of providing Aquatic Passage

over or around the Damover or around the Dam


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Photos and schematic courtesy of the USGSPhotos and schematic courtesy of the USGS

Eel PassageEel Passage


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Approach Too ShallowApproach Too Shallow

Too HighToo High

Too littleToo little

flowflowToo FastToo Fast

Too SmallToo Small


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EnergyEnergy DissipatorsDissipators

Auxiliary SpillwayAuxiliary SpillwayPrimary Spillway and lowPrimary Spillway and low

level drainlevel drain

Can the Existing Dam Provide Aquatic Passage?Can the Existing Dam Provide Aquatic Passage?


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HighervelocityShootingflow

HighervelocityShootingflow

Lower velocity flowLower velocity flow


How a grass lined auxiliary Spillway worksHow a grass lined auxiliary Spillway works

Assess: Auxiliary Spillways potentialAssess: Auxiliary Spillways potential

For Passage ?For Passage ?


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Strategy:Strategy: Use a portion of the Spillway to install a stepped passageUse a portion of the Spillway to install a stepped passagefor the trip up stream.for the trip up stream.

Safety Concern:Safety Concern: If the passage significantly decreases spillwayIf the passage significantly decreases spillwaycapacity, the dam may overcapacity, the dam may over--top during a storm.top during a storm.


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How an In line Spillway works.How an In line Spillway works.

Assess:Assess: Primary spillwaysPrimary spillways

potential For Fish Passage ?potential For Fish Passage ?


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How a Drop Box Low Level Drain WorksHow a Drop Box Low Level Drain Works

Primary Spillways potential for fish passage ?Primary Spillways potential for fish passage ?

Plunge Pool EnergyPlunge Pool Energy DissipatorDissipator

Remove boards and drain the pondRemove boards and drain the pond


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Another Strategy:Another Strategy: Install a new culvert through theInstall a new culvert through theembankment that is large enough to install velocity refugesembankment that is large enough to install velocity refugesin the bottomin the bottom

Safety Concern:Safety Concern: If the soil isnt compacted properly around theIf the soil isnt compacted properly around thenew culvert soil may pipe and fail the damnew culvert soil may pipe and fail the dam


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6 NYCRR Part 673

In 1999 ECL Section 15-0507 was amended and the

thresholds for requiring a dam safety permit

changed

Part 673, the current regulations are being changed

to reflect the new thresholds regarding height and

volume impounded by a dam.

Will a Dam Safety Permit beWill a Dam Safety Permit be

Required?Required?

FIRST QUESTIONFIRST QUESTION


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Answer:

YES, therefore a NYS Dam SafetyPermit is required if proposed

work goes beyond maintenance

Is the Dam above Volume and

Height Thresholds?

XX

XXXX

FIRST QUESTIONFIRST QUESTION


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SECOND QUESTIONSECOND QUESTION

Does the proposed construction go beyondmaintenance?

Or

Could improper construction lead to dam failure?

DAM SAFETY PERMIT PROCESSDAM SAFETY PERMIT PROCESS


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6 NYCRR Part 608.66 NYCRR Part 608.6

Application form with Supplemental D-1 attached. FormD-1 lists critical information regarding the dam

A design report along with construction documents (i.e.plans and specifications) prepared by or under thedirection of a NYS licensed Professional Engineer.

If a Permit is Required:You need to submit a complete

Application and wait for a permit.




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The Engineer will provide a final design inThe Engineer will provide a final design in

accordance with good engineering practice thataccordance with good engineering practice that

considers New York State guidelines for the designconsiders New York State guidelines for the design

of damsof dams


Addressed in Guidelines

Hazard Classification

Hydrologic Analysis

Hydraulic Design

Outlet works and Conduits

Subsurface investigation

Structural Stability

D i G id liDesign G idelines


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a. Hazard Classificationb. Hydrologic Analysis

c. Hydraulic Design

d. Outlet works and Conduits

e. Subsurface investigation

f. Structural Stability

g. Subsurface Investigation

Design GuidelinesDesign Guidelines

Assess the degree ofAssess the degree of

hazard failure, of thehazard failure, of the

dam, poses to downdam, poses to down

stream infrastream infra--structurestructureand populationand population

The procedure used to assessThe procedure used to assess

Hazard Class assumes that theHazard Class assumes that the

dam will fail .dam will fail .

The dams height and impounded volume determinesThe dams height and impounded volume determines

how big the initial flood wave is when the Dam failshow big the initial flood wave is when the Dam fails

suddenly.suddenly.

Design G idelinesDesign Guidelines


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NYSNYS Class AClass A

Low HazardLow HazardPotential damage to:Potential damage to:

isolated farmisolated farm

buildingsbuildings undeveloped landundeveloped land

township or countytownship or county

roadsroads

NYSNYS Class CClass C

High HazardHigh Hazard

Potential:Potential:

loss of lifeloss of life

damage todamage to

main highwaysmain highways

railroadsrailroads

important utilitiesimportant utilities

Potential damage to:Potential damage to:

homeshomes

main highwaysmain highways

minor railroadsminor railroads

relatively importantrelatively important

utilitiesutilities

NYSNYS Class BClass B

IntermediateIntermediate

HazardHazard

NOTE: Hazards can changeNOTE: Hazards can change

Design GuidelinesDesign GuidelinesMoreMoreFactsFacts::

Dam Safety Permitting Process


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Dam Safety Permitting Process

Permit for the Construction, Reconstruction, Removalor Repair of a Dam

Project Schedule

Design

Bid

ConstructOperate

HazardC

lassificatio

n

Form

D-1and

TechnicalReview

FinalSubmittaland

PermitApproval

Inspectionand

Approvalto

Fill

maybe

required

IdentifyD

eficiencies

&

Remed

ialOptions

Inspectio

nby

Const.En

gineer

Engineers

Cert.&

As-builtDocs


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Is Dam Removal anIs Dam Removal an

Option?Option?

-- Feasibility of RepairingFeasibility of Repairing

and Maintaining a Damand Maintaining a Dam

-- Feasibility and DesignFeasibility and Design

of Dam Removalof Dam Removal

-- Feasibility of providing AquaticFeasibility of providing Aquatic

Passage over or around the DamPassage over or around the Dam

FocusFocus

Technical/EngineeringTechnical/Engineering


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-- Technical/EngineeringTechnical/Engineering

-- B. Feasibility and Design of Dam RemovalB. Feasibility and Design of Dam RemovalB1. Obtaining Dam Removal PermitsB1. Obtaining Dam Removal Permits

B2. Protecting Against Environmental ImpactsB2. Protecting Against Environmental ImpactsB3. Managing SedimentB3. Managing Sediment

B4. Removing StructuresB4. Removing StructuresB5. Protecting Infrastructure.B5. Protecting Infrastructure.

B6. Restoring the ChannelB6. Restoring the ChannelB7. Restoring Recovered LandB7. Restoring Recovered Land

FocusFocusNYS DAM SAFETY PERMITNYS DAM SAFETY PERMIT


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a. Hazard Classification

b. Hydrologic Analysis

c. Hydraulic Design

d. Outlet works and

Conduits

e. Subsurface investigation

f. Structural Stability

Factors that influence Hydrology

Watershed Geometry

Size, Shape, Storage

Hydrologic Characteristics

Soils, Slopes, Cover Type, Land use

Curve Number, Time of Concentration

Rainfall- Depth, Intensity, Duration

Routing Stage vs Discharge


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NYS Department of Environmental ConservationHurricane Floyd1999 September 14 20:29 UT1999 September 14 20:29 UTNOAANOAA--14 satellite14 satellite


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Example DamExample Dam


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TROPICAL STORM TAMMY OCTOBER 2005TROPICAL STORM TAMMY OCTOBER 2005


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Addressed in Guidelines

Hazard Classification

Hydrologic Analysis

Hydraulic Design

Outlet works and Conduits

Subsurface investigation

Structural Stability

FocusFocus

FocusFocus


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Stability of the Structure as it is being deStability of the Structure as it is being de--constructed and afterconstructed and after


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Stability of the Structure as it is being deStability of the Structure as it is being de--constructed and afterconstructed and after

Hydraulic capacity of the finished channel to pass a design storHydraulic capacity of the finished channel to pass a design stormm


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Hydraulic capacity of the finished channel to pass a design storHydraulic capacity of the finished channel to pass a design stormm

Emergency AuthorizationEmergency Authorization


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g yg y

THE ENDTHE ENDXX dingE ding


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THE ENDTHE END

I Made it !!!!I Made it !!!!

XX

HappyEndi

ng

HappyEndi

ng

Documents

Restoring Migratory Fish Habitat Dam Safety Considerations