Total Maximum Daily Loads for Organic Enrichment and Siltation, Don Williams Lake, Boone County Iowa,2005

(2005) Total Maximum Daily Loads for Organic Enrichment and Siltation, Don Williams Lake, Boone County Iowa,2005. Natural Resources, Department of

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Abstract

The Federal Clean Water Act requires the Iowa Department of Natural Resources (IDNR) to develop a total maximum daily load (TMDL) for waters that have been identified on the state’s 303(d) list as impaired by a pollutant. Don Williams Lake has been identified as impaired by organic enrichment and siltation. The purpose of these TMDLs for Don Williams Lake is to calculate the maximum allowable nutrient loading for the lake associated with organic enrichment levels and a siltation rate that will meet water quality standards. This document consists of TMDLs for organic enrichment and siltation designed to provide Don Williams Lake water quality that fully supports its designated uses. Phosphorus, which is related through the Trophic State Index (TSI) to chlorophyll-and Secchi depth, is targeted to address the organic enrichment impairment. Sediment delivery is targeted to address the siltation impairment.