Unformatted text preview: unit hydrograph. 3 - Use this unit hydrograph to estimate the predevelopment hydrograph flow for the 20 year design storm (with the rain duration equal to the natural (predevelopment) time of concentration of 2.5 hours). The net rainfall depth can be estimated as: predevelopment runoff coefficient *I* natural Tc, I=160/(natural Tc+30). We will discuss the project in detail tomorrow and answer any questions you may have. The project due date is postponed to Friday, December 16....
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- Spring '05
- tc, 2.5 hours, 2 hr, 20 year, predevelopment peak, net rainfall depth