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Clarks Creek Draft Allocations 7/27/2011 4 Figure 1. Updated Conceptual Model for DO Impairment in Clarks Creek Water With- drawals Increased Impervious Area Urban Runoff Hatchery Discharges Lack of Riparian Cover Elodea nuisance growth Respiration Depletion of DO Reduced Infiltration Reduced Baseflow Reduced Flow Velocity Reduced Reaeration Nutrients Solids Organic Material Siltation SOD Reduced Average DO Thermal Load Elevated Water Temperature Decreased DO Saturation Concentration Impaired DO Nutrient Regeneration Stressors Processes Impacts Increased Sunlight Spring Discharge Nitrate Load in Springs Reduced DO in Springs y Reduced DO in Storm Drainage ---PAGE BREAK--- Elodea Nuisance Growth Stormwater Reduced Shade Solids and organic material accumulation Elevated nutrient loads Increased sunlight Bacterial oxygen consumption (SOD) Algal Respiration Reduced velocity and reaeration Increased water temperature Reduced Dissolved Oxygen Stressors Processes Impacts