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Slide 3
Non-Point Source Pollutants…
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Hydrologic/Ecologic Importance
July-September
2007 2008
480 cfs 549 cfs - Yakima River at Parker
441 cfs 442 cfs – Reservation tributaries (below Parker)
Slide 8
For July-September …
The “Muddy 5”
contributed 85% of the TSS loading and only 52% of the flow.
South Satus Drain - 52% of TSS load
& 14% of flow
Satus-Marion-Toppenish:
15% of Reservation TSS load
Slide 10
Fecal Indicator Bacteria
Sites that meet standard during irrigation season:
Fecal Coliform
1 of 13 drains/streams
0 of 3 internal drains
5 of 5 reference sites
E. Coli
0 of 13 drains/streams
0 of 3 internal drains
3 of 5 reference sites
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Slide 13
Nutrients
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Take Home Messages
Improvements have been realized, but there is still work to be done
Variability in time and space at multiple scales is key to understanding the system
Hydrology strongly influences water quality and is a driving force in determining certain parameters
More Information
http://www.ecy.wa.gov/eim Scott Ladd, Hydrologist Yakama Nation Water Resources Program ladds@yakama.com
How to improve
on-farm turbidity targets;
reduced water deliveries;
conversion to sprinkler or drip;
convert open ditches to pipe;
BMPs – settling ponds, filter strips, PAM
WIP Priority Improvement Measures
WIP Priority Improvement Measures
Reduce backlog of deferred maintenance ($200+ million)
Better water accounting throughout system
Re-regulation reservoirs
Pipe Satus Unit
On-farm conservation
Canal lining
Conversion to wildlife refuge