Determine the peak flow of return period 5 years at the outlet D. The IDF equation for the area is: i (in/hr)=120 T0.175/(tc+27) where, T = return period in years and to is time of concentration in minutes. III IV E NE VI B Catchment Area II Runoff coefficient Inlet time A C (acres) (min) I II III 2343 0.7 0.7 0.6 IV 4 0.6 10 V 5 0.5 15 VI 4.5 0.5 15 VII 4.5 0.5 15 ST00555 7 10 VII Pipe Length (ft.) Slope (%) EB 450 0.64 AB 550 0.81 BC 400 0.64 CD 450 0.64 Note: Assume the flow velocity in each pipe is 5 ft/s

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A rain depth of 10 inches falls on a developed area of Charleston (CN = 90). Estimate the runoff. (P-I)2 R P- la+S 1000 S = CN - 10 www Ia = 0.2 (S) O 7.8 inches O 6.8 inches O 9.8 inches O 8.8 inches O 5.8 inches

Develop the Total I 1-hour Unit Hydro o Index is 2 cm Assume a baseflow of 2 m/s. SHOW SAMPLE CALCULATION BELOW for all types of calculations you need to do. ograph (TH) from a 3-hour duration storm on a watershed whose 1(UH) is given in the first two columns of the table below. Storm Data: Time 1" hour 2nd hour 3rd hour Rainfall depth (cm) 4 3 2.5 Computation Table (Please Fill-in the Blanks as needed) I-hr UH Time (hr) Direct Runoff per period and baseflow (use space as needed) Total Hydrograph Q (cms) (m'/s) 58 110 96 53 26 14 8. 9 4 10 3 11 1.5 12 13 14 15 16 Sample calculation (with proper units): Runoff depth sample calculation needed.A completely-worded sample calculation using Principle of Linearity is a must for any partial credit. Must show unit cancellations. Additional space in the nex page.