1. Nutrient Retention Model Water Supply Model Precipitation Evapotranspiration Soil Depth and Plant available water Land cover Topography (slope/runoff) Vegetation export coefficient/loading Vegetation filtration rates Modeling Water Supply & Nutrient Retention

2. Water Discharge (m 3 /yr) Calibrate to USGS data

3. Nutrient Export (kg/yr) Total export to Hood Canal

4. Nutrient Retention (kg/ha/yr) Service Provides relative pattern of services across the watersheds Small watersheds can have high retention values Can analyze watersheds collectively…. frontal versus Olympic drainages Low retention areas most vulnerable land cover transitions to developed areas