cee5734_hw12_2011

# cee5734_hw12_2011 - Virginia Tech Department of Civil and...

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1 Virginia Tech Department of Civil and Environmental Engineering CEE 5734 Urban Hydrology and Stormwater Management Homework #12: Nutrient Loading, BMPs, and Best BMP Strategies Due: April 27, 2011 (slightly revised after class) This homework will reinforce lecture examples on nutrient loading calculations, nutrient removal through BMPs, and BMP optimization. Calculations: 1. Use the “Simple Method/PLOAD” to determine the total Phosphorus, Nitrogen, and Lead annual loads for a 1.2 mi 2 watershed that is 60% “older urban areas” and 40% “hardwood forest”. Use the EMC data from Schueler (1987). Assume an annual rainfall of 40 inches, imperviousness of older urban areas are 85%, imperviousness of hardwood forest is zero, and Lead EMCs from hardwood forests are 0.0 mg/L. 2. Using the linear program and solver developed and demonstrated in class: Minimize c = 3675x1 + 1200x2 + 5800x3 + 6x4 subject to x1 >= 0 x2 >= 0 x3 >= 0 x4 >= 0 x1 + x2 + x3 + x4 <= 1480 3.51x1 + 2.925x2 + 3.861x3 + 1.989x4 >= **** Replace **** with actual numbers varying from approximately zero through 6000.

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