David P. Statler n Nez Perce Tribe n Department of Fisheries Resources Management n Director of Resident Fisheries.

David P. StatlerDavid P. Statler

Nez Perce TribeNez Perce Tribe Department of Fisheries Resources Department of Fisheries Resources

ManagementManagement Director of Resident FisheriesDirector of Resident Fisheries

Dworshak Integrated Rule Dworshak Integrated Rule Curves/Curves/

Monitoring and EvaluationMonitoring and Evaluation

Proposal 198740700Proposal 198740700

Dworshak Dam and Reservoir are located in the Clearwater Subbasin of the Mountain Snake Ecological Province, about -35 miles east of Lewiston, Idaho.

Regional LocationRegional Location

Subbasin LocationSubbasin LocationDworshak Dam is located in the northwest quadrant of the Clearwater Subbasin, within the Nez Perce Indian Reservation.

Dworshak Dam Statistics* Located on North Fork Clearwater River at River Mile 1.9.

* 717 feet high.

* Highest straight-axis concrete dam in the W. Hemisphere

* Third highest dam in the US.

54 miles long at full pool (1600 ft msl) 19,824 surface acres-175 miles shoreline 3,453,000 acre-feet gross storage 2,000,000 acre-feet active storage

,

Reservoir Statistics

No Fish Passage

Lower North Fork

Upper North Fork ACCESS

Clearwater

Subbasin

Dworshak Dworshak DamDam

Blocked by Dworshak DamBlocked by Dworshak Dam

25% (2440 square miles) of the 25% (2440 square miles) of the total Clearwater Subbasin area.total Clearwater Subbasin area.

60% of the steelhead spawning 60% of the steelhead spawning area in Clearwater Subbasinarea in Clearwater Subbasin

1.5 million square yards of 1.5 million square yards of steelhead spawning habitatsteelhead spawning habitat

1.3 million square yards of chinook 1.3 million square yards of chinook salmon spawning habitatsalmon spawning habitat

Dworshak OperationsDworshak Operations

Operated by US Army COEOperated by US Army COE Authorized Project PurposesAuthorized Project Purposes

– flood controlflood control– hydropowerhydropower– in-reservoir navigationin-reservoir navigation

Also operated forAlso operated for– recreation, water quality, reservoir recreation, water quality, reservoir

fisheries, and listed anadromous fish fisheries, and listed anadromous fish

Proposal ObjectivesProposal Objectives

Refine the Dworshak Rule Curve Evaluation Model (DRCEM).

Identify and update appropriate integrated rule curve (IRC) operations.

Institute appropriate integrated operations.

Develop a comprehensive long-term M&E Plan for Dworshak Reservoir.

Integrated Rule Curves - Integrated Rule Curves - A DefinitionA Definition

Integrated Rule Curves (IRCs) are a Integrated Rule Curves (IRCs) are a family of rules for dam operation family of rules for dam operation that incorporate incremental that incorporate incremental adjustments to allow for adjustments to allow for uncertainties in water availability.uncertainties in water availability.

IRCs serve a spectrum of IRCs serve a spectrum of operational needs.operational needs.

Development ofDevelopment ofDWR Integrated Rule DWR Integrated Rule

Curves Curves

RequisitesRequisites– Understanding of multi-purpose Understanding of multi-purpose

needsneeds– Coordination with entities with Coordination with entities with

expertise and public responsibilities expertise and public responsibilities to serve these needsto serve these needs

– Use of available tools to effectively Use of available tools to effectively evaluate alternatives and tradeoffs evaluate alternatives and tradeoffs

Defining Individual DWR Defining Individual DWR Rule CurvesRule Curves

Integrated rule curve development Integrated rule curve development first requires the definition of first requires the definition of individual operational rule curves for individual operational rule curves for the various needs served by the the various needs served by the project, including:project, including:– flood controlflood control– recreationrecreation– hydropowerhydropower– navigationnavigation– resident fish, anadromous fish, wildlife, resident fish, anadromous fish, wildlife,

cultural resources cultural resources

Individual Rule CurvesIndividual Rule Curves

Following is a series of graphs intended Following is a series of graphs intended to define rule curves for specific needs to define rule curves for specific needs and project purposesand project purposes

Rule curves need to be minimally Rule curves need to be minimally defined as elevations or dischargesdefined as elevations or discharges

The following curves are based on The following curves are based on operational criteria currently defined by operational criteria currently defined by the appropriate regulating and the appropriate regulating and operating entities and other experts operating entities and other experts

1400

1450

1500

1550

1600

Average Low High

No flood storage space needed July 1 - September 1.

1586 on Oct 1

1579 on Nov 15.

1558 on Dec 15.

Max drawdown on April 1 based on run-off forecasts after Jan 1.

DWR Flood Control Rule DWR Flood Control Rule CurveCurve

1400

1450

1500

1550

1600

Depicts operations prior to BIOP flow augmentation for listed salmon.

Described and modeled as SOR Alternative 1b (optimum load-following).

Minimal summer draft.

DWR Hydropower Rule DWR Hydropower Rule CurveCurve

1400

1450

1500

1550

1600

June - August peak recreation.

1590 most sites usable.

Minimum elevation 1590 June 1 - September 1.

Default to f.c. rule curve during other periods.

DWR Recreation Rule DWR Recreation Rule CurveCurve

1400

1450

1500

1550

1600

Log dumps are effectively operational from June 15-Sept 15.

Log dumps are effectively operational at 1595.

Default to f.c. rule curve during other periods.

DWR Navigation Rule DWR Navigation Rule CurveCurve

1400

1450

1500

1550

1600

1600 June-October

Stable pool as long as possible to minimize erosive impacts.

f.c. rule curve Nov-May.

(per discussions with NPT Cultural Resources Department)

DWR Cultural Resources DWR Cultural Resources ProtectionProtection

1400

1450

1500

1550

1600

1600 June-October.

f.c. rule curve Nov-May.

(Criteria from Alternative 4c in 1995 SOR - considered fish habitat and reservoir food production.)

DWR Resident Fish Rule DWR Resident Fish Rule CurveCurve

Hydro Models

Hydrosim

HYSSR

Genesis

DWR

Elev.

Flows

Food Production

Bull trout forage (redside shiner) production

Bass spawning/inc/ rearing

DWR Volume Surf Acres

SOR MODEL

Habitat Suitability

Bull trout

Smallmouth Bass

KokaneeKokanee Entrainment

Fish Index Value

Light

Temp

Reservoir Area

Shore Area

River (inflow)

Terrestrial InputOutflow

Phytoplankton

Zooplankton

Benthic Insects

Terrestrial Insects

Fish Growth or Index

Dworshak Rule Curve Evaluation Model Schematic

1400

1450

1500

1550

1600

sep

oct

nov dec

jan

feb

mar ap

rm

ay jun ju

lau

g

Draft to 1520 by August 31.

Refill to flood control rule curve by December 15.

Default to f.c. rule curve during other periods.

Refill as soon as possible late spring.

DWR NMFS BIOP Rule DWR NMFS BIOP Rule CurveCurve

NMFS BIOP 2000 UpdateNMFS BIOP 2000 Update

NMFS is calling for an evaluation of the NMFS is calling for an evaluation of the benefit to listed stocks of an additional benefit to listed stocks of an additional 20-feet of Dworshak drawdown in late 20-feet of Dworshak drawdown in late summer/early fall.summer/early fall.

Increases the challenge to achieve Increases the challenge to achieve meaningful multi-purpose integration of meaningful multi-purpose integration of operational needs.operational needs.

Greater departure from normative Greater departure from normative conditions for the Clearwater system. conditions for the Clearwater system.

Composite DWR Rule Composite DWR Rule CurvesCurves

1440

1460

1480

1500

1520

1540

1560

1580

1600

1620

sep

oct

nov dec

jan

mar ap

rap

rm

ay jun ju

lau

g

FloodcontrolPower

Recreation

Navigation

CulturalResRes Fish

NMFSBIOP

Challenges to IRC OperationsChallenges to IRC Operations

Recreation, navigation, resident fish, Recreation, navigation, resident fish, flood control and power have flood control and power have generally similar rule curves. (Power generally similar rule curves. (Power has more aggressive fall drawdown.)has more aggressive fall drawdown.)

BIOP summer drawdown of 80 feet BIOP summer drawdown of 80 feet by August 31 is adverse to by August 31 is adverse to recreation, navigation, resident fish, recreation, navigation, resident fish, power and cultural resources. power and cultural resources.

SummarySummary Flood control requirements are hard Flood control requirements are hard

constraints affecting pool elevation constraints affecting pool elevation and discharge.and discharge.

BIOP flow targets are behave like BIOP flow targets are behave like hard constraints affecting pool hard constraints affecting pool elevation and discharge.elevation and discharge.

Spring flood control operations may Spring flood control operations may conflict with spring BIOP flow conflict with spring BIOP flow targets.targets.

Summary (cont.)Summary (cont.)

BIOP spring flow targets may compete BIOP spring flow targets may compete with desired BIOP summer flow with desired BIOP summer flow conditions.conditions.

BIOP summer drawdown adversely BIOP summer drawdown adversely affects other project needs including affects other project needs including power, navigation, recreation, resident power, navigation, recreation, resident fish and cultural resources. fish and cultural resources.

Power emergencies trump everything Power emergencies trump everything else.else.

Summary (cont.)Summary (cont.)

Relaxing of flood control space Relaxing of flood control space requirements would decrease the requirements would decrease the conflict between spring flood control conflict between spring flood control operations and BIOP spring flow targets operations and BIOP spring flow targets (and benefit other project needs).(and benefit other project needs).

Increased spring discharges while Increased spring discharges while assuring refill will generally require less assuring refill will generally require less draft for flood control, especially during draft for flood control, especially during medium to high water years. medium to high water years.

Monitoring and EvaluationMonitoring and EvaluationComprehensive PlanComprehensive Plan

bull trout

kokanee

water

quality

entrainment

zooplankton

nutrients

benthos

fisheries

BIOP 2000

cultural

resources

recreation

cutthroat

troutintrogression

modeling

impacts