Development of Water Quality Standards for Willard Spur 2011 Hydrology & Nutrient Loads Willard Spur Science Panel April 5, 2012Photo:Josh Noble
What was our objective for 2011?• Understand the sources, quantity, timing, and mechanisms of water and nutrient loading• Relative contribution of the POTWNote: Recognized that 2011 was potentially a wet year • April 2011 snowpack: 185% of normal • April 2012 snowpack: 65% of normal
What we did in 2011• Mapped and measured inflows• Monitored nutrients in inflows• Measured outflow• Monitored weather• Monitored water surface elevations
Something to consider….• What does the data mean in the context of our overall objectives?• How does this influence what we do in 2012?
Bear River @ Corinne Overall Inflows (2011) Did Willard Spur Water level close off in 2011/2012? BRMBR “weir”Willard Bay
Apparent elevation where GSLchanges salinity of WillardSpur = 4201.8ft
Observations• 2011 represented a very wet year – Does not appear to have “closed”, rare event since floods of 1980’s• Bear River most significant source of flow followed by Willard Bay, Harold Crane WMA• Residence times increased
Nutrient Loads• Estimated from flow volume and discrete water quality samples (~1/mth) – LOADEST model requires more sample points than what we have – Used spreadsheet to estimate preliminary loads – Still trying to address discrepancies in flow data for Harold Crane WMA
Trend of Total Nutrient Loads to Willard Spur 600,000 Total Nitrogen 500,000 Total PhosphorusNutrient Loads (lbs/month) 400,000 300,000 200,000 100,000 0 June, 2011 July, 2011 August, 2011 September, 2011
June, 2011 - Total Phosphorus Loads June, 2011 - Total Nitrogen Loads to to Willard Spur Willard Spur 10.35% 13.51% 0.07% 0.16% 0.00% Willard Perry WWTP 0.00% Willard Perry WWTP Willard Bay Willard Bay Bear River Refuge 86.33% Bear River Refuge 89.59% Harold Crane WMA Harold Crane WMA
July, 2011 - Total Phosphorus Loads to July, 2011 - Total Nitrogen Loads to Willard Spur Willard Spur 0.71% 0.96% 0.93% 1.42% 0.00% Willard Perry WWTP 0.00% Willard Perry WWTP Willard Bay Willard Bay Bear River Refuge Bear River Refuge 98.35% 97.63% Harold Crane WMA Harold Crane WMA
August, 2011 - Total Phosphorus August, 2011 - Total Nitrogen Loads to Loads to Willard Spur Willard Spur 0.50% 0.62% 3.20% 2.78% 0.00% Willard Perry WWTP 0.00% Willard Perry WWTP Willard Bay Willard Bay Bear River Refuge Bear River Refuge 96.31% 96.60% Harold Crane WMA Harold Crane WMA
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