Tucannon/Pataha Watershed Tucannon/Pataha Watershed TMDL TMDL - - PowerPoint PPT Presentation

Tucannon/Pataha Watershed Tucannon/Pataha Watershed TMDL TMDL

Where are we at & Where are we going

Photo of Tucannon River near Territorial Road Bridge taken by HDR, 7/25/2005

WHY DO TMDL WHY DO TMDL’ ’S? S?

• It’s the law
• EPA lawsuit
• Clean Water !

WHAT IS A TMDL? WHAT IS A TMDL?

Water Quality Standard Pollution Reduction Required Total Pollutant

• Total Maximum Daily Load
• Water Clean-up Plan

THE POLLUTION PIE THE POLLUTION PIE

Point Point-

• source

source Non Non-

• point

point source source

ISSUES WITH TMDLs ISSUES WITH TMDLs

• More time spent planning, less

More time spent planning, less doing doing

• Duplicative of other planning

Duplicative of other planning processes processes

• Regulator centric = stretched

Regulator centric = stretched resources resources

STREAMLINED TMDL STREAMLINED TMDL

• Data Collection
• TMDL Reports
• Management Focused
• Implementation Ongoing

WHY HERE? WHY HERE?

• Mostly non

Mostly non-

• point sources

point sources

• Small watersheds

Small watersheds

• Data already exists

Data already exists

• Implementation happening

Implementation happening

TMDL Development Strategy TMDL Development Strategy

• Address comments on the 2005 HDR study.
• Analysis of existing data for Pataha Creek.
• Complete the required TMDL elements.

Comments on 2005 Study Comments on 2005 Study

• Discussion needed for system potential

Discussion needed for system potential vegetation analysis. vegetation analysis.

• Question about water withdrawls

Question about water withdrawls assumptions. assumptions.

• What was the effect of the 2005

What was the effect of the 2005 ‘ ‘School School House House’ ’ fire. fire.

• The Qual2K model analysis needed a

The Qual2K model analysis needed a verification model run. verification model run.

ò

Why was the 2005 study not ready Why was the 2005 study not ready for submittal? for submittal?

• A TMDL requirements not included:

A TMDL requirements not included:

– – A discussion of seasonal variation and A discussion of seasonal variation and address potential issues related to climate address potential issues related to climate change. change. – – Load and waste load allocations Load and waste load allocations – – Margin of Safety Margin of Safety – – Summary Implementation Strategy Summary Implementation Strategy

So what do we know so far? So what do we know so far?

Stream Temperatures Stream Temperatures

• Warmest day (7/31) vs. Model Day (7/13)

Warmest day (7/31) vs. Model Day (7/13)

• Tributary affect on Tucannon

Tributary affect on Tucannon

• Temperatures During Schoolhouse Fire

Temperatures During Schoolhouse Fire

Comparison of Daily Maximum (DMax) Stream Temperatures for Tucannon River and Tributaries

5 10 15 20 25 30 10 20 30 40 50 60 70 80 90 100 River Kilometer (RKm) Temperature (C) Tucannon Dmax on 7/13/05 Tucannon Dmax on 7/31/05 Tributary DMax on 7/13/05 Tributary DMax on 7/31/05

July 2005 Daily Average Streamflow

10 20 30 40 50 60 70 80 5 10 15 20 25 30 35 July Day 2005 Tucannon Streamflow (cfs) 0.5 1 1.5 2 2.5 3 3.5 4 Pataha Streamflow (cfs)

Tucannon Streamflow Pataha Streamflow

Burn Period Burn Period

Seepage Survey Data Seepage Survey Data

• Comments about the seepage survey

Comments about the seepage survey have been addressed have been addressed

– – Estimated sprinkler usage vs. water right Estimated sprinkler usage vs. water right claims and metering database claims and metering database – – Seepage results make sense with the existing Seepage results make sense with the existing knowledge of the watershed knowledge of the watershed’ ’s hydrogeology s hydrogeology

Comparison of Daily Average (DAve) Stream Temperature and Groundwater Gain and Loss Volumes Using HDR and Ecology Seepage values

5 10 15 20 25 30 10 20 30 40 50 60 70 80 90 100 River Kilometer (RKm) Stream Temperature (C)

• 20
• 15
• 10
• 5

5 10 15 20 Seepage gain/loss (+/-cfs) Tucannon DAve 7/31/05 Tucannon DAve 7/13/05 Tributary DAve 7/13/05 HDR Seepage estimates Ecology Seepage estimates Cold Creek Cummings Creek Hixon Creek Lil' Tucannon Creek Panjab Creek Pataha Creek Hite Fault Major Fault Monocline Anticline Anticline Syncline Syncline

Geologic Faults and Folds

Comparison of Tucannon River Streamflow and Seepage as Percent of Total

• 3%

0% 32%

• 9%

17%

• 3%

14%

• 19%

24%

• 35%

14%

• 39%

10%

• 12%

26%

• 10%

10 20 30 40 50 60 70 10 20 30 40 50 60 70 80 RKm Streamflow (cfs)

• 100%
• 80%
• 60%
• 40%
• 20%

0% 20% 40% 60% 80% 100% Mainstem Discharge (cfs) DAve on 7/13/05 Zero Seepage Line Seepage as % of total flow

M a j

• r

F a u l t M a j

• r

F a u l t S y n c l i n e S y n c l i n e Anticline Anticline

H i t e F a u l t H i t e F a u l t Major Fault Major Fault

Hixon Creek

• Checked vegetation coding in

Checked vegetation coding in HDR HDR’ ’s s analysis against better aerial imagery. analysis against better aerial imagery.

• Pataha Creek vegetation analysis is in

Pataha Creek vegetation analysis is in process process

Riparian Vegetation Analysis Riparian Vegetation Analysis

Delineated Riparian Vegetation Delineated Riparian Vegetation

200ft Buffer on both sides of Tucannon River 200ft Buffer on both sides of Tucannon River

Tucannon River Burned Riparian Areas Tucannon River Burned Riparian Areas

• 0.05

0.05º ºC C 0.19 0.19º ºC C 0.15 0.15º ºC C 0.37 0.37º ºC C 0.75 0.75º ºC C ∆ ∆DMax Stream Temperature on 7/13/05 DMax Stream Temperature on 7/13/05 Schoolhouse Fire 8/5/05 Schoolhouse Fire 8/5/05 -

• 8/13/05

8/13/05 Intake Intake Wooten Hatchery Outlet Wooten Hatchery Outlet

Temperature Accuracy Temperature Accuracy ± ±0.2 0.2º ºC C Burned Vegetation Burned Vegetation

Next Steps for Vegetation Analysis Next Steps for Vegetation Analysis

• Define and Validate values used for

Define and Validate values used for system potential vegetation system potential vegetation

• Rerun SHADE for current vegetation

Rerun SHADE for current vegetation

• Define Load Allocations for effective shade

Define Load Allocations for effective shade

Next Steps for TMDL Submittal Next Steps for TMDL Submittal