cee5734_hw1_2011 - Virginia Polytechnic Institute and State...

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1 Virginia Polytechnic Institute and State University Department of Civil and Environmental Engineering CEE 5734 Urban Hydrology and Stormwater Management Homework #1: Introduction to the Rational Method Due: January 26, 2011 (revised) This first homework introduces the Rational Method along with issues of precipitation frequency and inlet/pipe design. Students will obtain and interpret precipitation frequency data from the NOAA Atlas 14 web site. Students will apply the rational formula to determine discharges produced by two adjacent runoff areas and use these calculations to design inlet sizes and appropriate pipe diameters. In all calculations students will demonstrate an appropriate understanding of significant figures. Tasks: 1. Go to the NWS NOAA Atlas 14 web site and obtain the IDF curve information for: BLACKSBURG 3 SE VA (44-0766). Use the Annual Exceedance Probability (derived from the annual maximum series) data for this location in all problems in this assignment. Calculations: 1. Compare/contrast “average recurrence interval” (ARI) and “annual
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