Laserfiche WebLink
_ ~P- c3 <br />tiVor{csheel; 4: Graphical Pealc Discharge method <br />Jr `t Ir- ^~f" //~~h~e By,Jj.W. Date /o.b-o¢ <br />cation I ~/25"~'P ~Hn~ Checked Date <br />Circle one: Present Developed P~4~ K ec~ <br />I. Data: <br />Drainage area .......... Am = d,0 0 3 mil (acres/640} <br />Runoff curve number .... CN = g b (From worksheet 2) <br />Time of concentration .. To = o• 0 3 hr (From worksheet 3) <br />Rainfall distribution type = ~)- (I, IA, II, III) <br />Pond and swamp areas spread <br />throughout watershed ...... _ ~ percent of Am ( acres or miZ covered) <br />Z. Frequency ............................... <br />3. Rainfall, P (24-hour) ................... <br />yr <br />in <br />Storm 1 Storm J12 Storm !!3 <br />~~ <br />/, S <br />• Initial abstraction, Ia ................. <br />(Use CN with table 4-I.) <br />5. Compute I /P ............................ <br />a ~ <br />in o• 3ZG <br />D. 2! 7 -~~ <br />6. Unit peak discharge, q ................. csm/in 9So <br />u <br />(Use Tc and Ia/P with exhibit 4- S ) <br />7. Runoff, Q ............................... <br />(From worksheet 2). <br />in ~ .~~° <br />8. Pond and swamp adjustment factor, Fp ,... <br />(Use percent pond and swamp area <br />with table 4-2. Factor is 1.0 for <br />zero percent pond and swamp area.) <br />9. Peak discharge, qp ...................... <br />(4lhere qp - quAmQFp) <br />cfs /~ 3// <br />• <br />1).q (210-VI-TR-55, Second Ed., Junc 199G) <br />