CIVE 4179 HW#2

# CIVE 4179 HW#2 - (not just CSOs Briefly describe two...

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CIVE 4179 HOMEWORK #2 Due Friday, Feb 10, 2012 Problem 1. Pollutant concentrations in water are frequently reported in units of ppm or mg/l. What is the difference between ppm and mg/l? When are these units of concentration essentially equivalent? Problem 2. Show that the drinking water standard of 10 mg/L nitrate as nitrogen is equivalent to 45 mg/L nitrate. How is nitrate related to TN and TKN? Problem 3. Explain the difference between combined and separate sewer systems. In your opinion, which type of system is more environmentally benign? List at least three factors that support your opinion. Problem 4. Explain the concept of the “first flush” as it applies to NPS in general
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Unformatted text preview: (not just CSOs). Briefly describe two hypothetical scenarios (agricultural or urban) besides CSOs: One scenario where a first flush occurs, and one scenario where a first flush does not occur. Problem 5. Assume that the Pb data in Box 3.2 are annual maximum EMCs for 1997 through 2005. Estimate the median, 90th, and 95th percentiles: 1) nonparametrically with Eq. 3.12, 2) assuming a normal distribution, and 3) assuming a lognormal distribution. Estimate the two-year, 10-year, and 25-year return period EMCs assuming a normal and lognormal distribution. What is the longest return-period EMC than can be estimated nonparametically?...
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