Total Maximum Daily Loads

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Presentation transcript:

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