Sue Patnude (DERT), John Konovsky (Squaxin Island Tribe) and Doug Myers (People for Puget Sound) give a presentation about the benefits of restoring the Deschutes River estuary in Olympia, WA.
22. Estuaries Remove Nitrogen through Nitrification and De-nitrification Nitrification and sequestration into plant tissues and sediments Microphytobenthos (benthic diatoms), salt marsh emergent vegetation Sediment surface bacteria on mudflats De-nitrification
28. Deschutes Estuary Restoration Team (DERT) You can find us at: http://www.deschutesestuary.org Friend DERT on Facebook at âDeschutes Estuaryâ
Editor's Notes
Slide 1: Salmonids are a Squaxin Priority A Deschutes Estuary will benefit more than salmonids naturally spawning and rearing in the Deschutes River A restored estuary will benefit ESA-listed, Puget Sound salmonids like White River spring chinook who âtourâ Budd Inlet before outmigrating to the ocean From Scott: Some outmigrating Deschutes fish such as coho rapidly move through the estuary while others like Chinook remain longer. For these fish, estuaries provide a gradual transition from the fresh water environment to salt water. The estuary provides productive feeding areas and predator refuge. Studies have shown that Chinook smolts that spend time in estuaries rather then heading straight to the salt water have higher survival rates. This early period is especially critical in the current era of lower marine survival in the ocean. The more healthy smolts we can put out to the ocean the more adults weâll get back.
Slide 2: Watershed Approach Essential, but Not Sufficient Based on best available science: TMDL/CLAMP/PSNERP/SHIRAZ etc. Upstream improvement insufficient to achieve WQS in lake/inlet Direct intervention necessary
Slide 3: Temperature Cooling upstream flow wonât cool all of Capitol Lake Middle and north basins are shallow and stagnant, and will still exceed standard Creation of estuary will improve circulation and further cool temperature
Slide 4: Fine Sediment Young geologic system 75% of fine sediment ânatural background conditionâ Therefore, high phosphorus load
Slide 5: Phosphorus Lake geometry cannot assimilate even natural load Dredged or not, lake will always have excessive algae blooms causing low DO Creation of estuary will improve nutrient dynamics
Slide 6: DO (@ current nutrient loading) Lake alternative: DO violations persist around Port Peninsula Max DO depletion > 1 mg/L Estuary alternative: DO standard violated in fewer areas of Budd Inlet Max DO depletion < 1 mg/L DO standard met in West Bay (where salmonids predominate) DO violations expand into East Bay Creation of estuary will diminish water quality violations and benefit salmonids
Slide 7: DO Standard Numeric standards do not apply Same narrative standard for estuary or lake Only 0.2 mg/L reduction allowable from natural background condition