RICE CREEK CHAIN OF LAKES TMDL

PELTIER LAKE TOTAL PHOSPHORUS MONITORING DATA

PELTIER LAKE TOTAL PHOSPHORUS MONITORING DATA, 2006 outlier removed

PELTIER LAKE CHOLORPHYLL MONITORING DATA

PELTIER LAKE SECCHI DEPTH MONITORING DATA

PELTIER LAKE 1991 – 2006, growing season

PELTIER LAKE DISSOLVED OXYGEN

PELTIER LAKE TOTAL PHOSPHORUS - SURFACE VS BOTTOM

CENTERVILLE LAKE TOTAL PHOSPHORUS MONITORING DATA

CENTERVILLE LAKE CHOLORPHYLL MONITORING DATA

CENTERVILLE LAKE SECCHI DEPTH MONITORING DATA

CENTERVILLE LAKE 2000 – 2006, growing season

CENTERVILLE LAKE DISSOLVED OXYGEN

CENTERVILLE LAKE TOTAL PHOSPHORUS - SURFACE VS BOTTOM

IN-LAKE MODELING  Bathtub: Reservoir water quality model developed by the U.S. Army Corps of Engineers  Includes models for TP, chlorophyll-a, and Secchi transparency  Steady-state water and nutrient balance calculations in a spatially segmented hydraulic network; accounts for advective and diffusive transport and nutrient sedimentation

MODEL STRUCTURE Peltier Lake Centerville Lake Upper Rice Creek Clearwater Creek Peltier direct drainage Hardwood Creek Centerville direct drainage Direct precip Direct precip Internal

PRECIPITATIONPRECIPITATION

MODEL SELECTION  Phosphorus: Canfield & Bachman, lakes (option 8)  Chlorophyll-a: P, light, T (option 2)  Secchi transparency: vs. Chl-a and turbidity (option 1)

MODEL CALIBRATION  Phosphorus calibration coefficient - adjusted from 1.0 to 0.6 for Peltier Lake  Chlorophyll-a calibration coefficient - adjusted from 1.0 to 1.5 for both Peltier and Centerville Lakes  Internal loading rate adjusted to further calibrate model

INTERNAL LOADING  Sediment data

CALIBRATION

VALIDATION

PELTIER LAKE TP LOADS Watershed loads represent 48% of total load

CENTERVILLE LAKE TP LOADS