cee5734_hw12_2011_solutions

# Cee5734_hw12_2011_so - Virginia Tech Department of Civil and Environmental Engineering CEE 5734 Urban Hydrology and Stormwater Management

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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 - Solutions This homework will reinforce lecture examples on nutrient loading calculations, nutrient removal through BMPs, and BMP optimization. Calculations: 1. (3 points – 1 point each for each pollutant) 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. Solution: See table below: Land Use Older Urban Areas Hardwood Forest Area (mi 2 ) 0.72 0.48 Area (acres) 460.8 307.2 Imperviousness (%) 85 0 Rv 0.815 0.05 Nitrogen EMC 13.6 0.78 Phosphorus EMC 1.08 0.15 Lead EMC 0.389 0 Precipitation (inches) 40 40 Constant 0.227 0.227 Runoff Fraction (Pj) 0.9 0.9 Nitrogen Load (lbs)

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## This note was uploaded on 12/24/2011 for the course CEE 5734 taught by Professor Moglen during the Spring '11 term at Virginia Tech.

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Cee5734_hw12_2011_so - Virginia Tech Department of Civil and Environmental Engineering CEE 5734 Urban Hydrology and Stormwater Management

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