Water Quality in a Changing Environment
Author: Anne-Marie E. Kirsch (Wisconsin Department of Transportation)
Total Maximum Daily Load (TMDL) requirements present a new challenge for Wisconsin Department of Transportation (WisDOT) designers. Recently, the Rock River TMDL for phosphorus and sediment was approved by USEPA covering the 3,700 square-mile Rock River basin. WisDOT is planning to expand I39/90 from four to six lanes for a 45 mile stretch from the Illinois State Line to the City of Madison. This length of highway crosses through three permitted Municipal Separate Storm Sewer System (MS4) areas. WisDOT has developed a strategy for separating our right-of-way from the surrounding MS4s and determining allocations based on relative contributions. Additionally, WisDOT developed an internal pollutant trading system to offset required reductions in MS4 areas by increasing total suspended solids reductions in un-permitted areas of the I39/90 corridor.
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How to Cite: Kirsch, A. E. (2014) “TMDL Implementation for Wisconsin DOT”, National Hydraulic Engineering Conference 2014. 1(2014).