Total Maximum Daily Loads High Rock Lake & Total Maximum Daily Loads
Today’s Agenda Introduction to Use-Support Methodologies and High Rock Lake TMDL Process Scoping Study Future Efforts Q & A Courtesy CWRC
Basinwide Planning Program Applies to All 17 River Basins
Use Support Methodology Aquatic Life Recreation Drinking Water Based on Stream Classification
Use Support Methodology Standards Chl a, pH, Dissolved Oxygen, etc. Aquatic Life Standards Met = Supporting Standards Not Met = Impaired Inconclusive Data = Not Rated No Data
Current Data (2003 Basin plan)
Current Data (2003 Basin plan)
High Rock Lake – Monitoring History 1974 – 1975 : EPA & DWQ determine nutrient enrichment. 1981 : UNC-CH documents elevated nutrients and chlorophylla concentrations 1989 – 1990 : DWQ intensive study 1992 – 1997 – 2002 : DWQ basinwide sampling.
Model History Early 1990’s : BATHTUB model Good loading information Estimate nutrient loads Determine Assimilative capacity Develop predictive tool Good loading information Good Phosphorous Prediction Poor Chla prediction Not Sufficient for TMDL purposes
Current Data (2003 Basin plan) High rock map
High Rock Lake Impairment Upper Lake Turbidity Low Dissolved Oxygen Chla
High Rock Lake Impairment Lower Lake Turbidity
High Rock Lake Impairment Abbots Creek Turbidity Low Dissolved Oxygen
High Rock Lake Impairment Second Creek Lake Arm NOT IMPAIRED Upstream is impaired : aquatic life
Everyone has an impact; Everyone must be part of the solution. Water quality management is a shared responsibility.
Basinwide Planning Program Website http://h2o. enr. state. nc Basinwide Planning Program Website http://h2o.enr.state.nc.us/basinwide/ or call 919-733-5083