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pD-S <br />Worksheet 4: Graphical Peak Discharge method <br />Pw~ect~ Qrn4 ~ ~ By Date <br />Location ~ ~/ -..~ Checked Date <br />Circle one: Present Developed <br />1. Data: <br />~.j~, <br />i . <br />~. <br /> <br /> <br />~ Drama a area .:.....:.. ~ o S mi <br />8 ~ ,0 ', 2 (acres/640): <br />Runoff curve number ....`CN.~ 8 0 (From worksheet 2)' <br />Time of conccatration ...Tc~~ , 0 3 hr (From worksheet 3) <br />Rainfall diatributloa types, !~_ (I, IA, IZ, III) <br />Pond aad evamp,areae spread <br />throughout watershed ......;~ ~ perceae of /~ _(_,_ acres or mil towered) <br />40- 5 <br /> Storm 1 Storm 2 Storm 3 <br />2. Frequency ............. ............... pr o0 <br />3. Rainfall, P (2v-hour) ..~ ................ in 2.6 <br /> <br />4, Initial abseractioa, Ia ............. <br />• in So 0 <br /> (Use C.V with table 4-1.) . <br />•'. <br />S. Compute Ia/P ............:............... d.19 <br />6. Unit peak discharge, qu „~ ............... cam/!a ~ 7S <br /> (Use Tt aad Ia/P with exhibit 4- L) - <br /> <br />7. ` <br />Runoff, Q .......~.......}:• .............. I <br />in ~ ~ , <br /> (From worksheet 2). <br />8. Pond and swamp ad)ustment~factor, F <br />,,,, '- <br /> p <br />(Use percent pond and svaq<p area <br /> with table 4-2. Factor 1$ L.0 for , <br /> zero percent pond and swamp area.) <br />9. Peak discharge, qp ....... ................ cfa 'S.Sa <br />(Where qp ~ quAmQFp) <br />Dd (210-VI-TR55, Second Ed., Tune 1986 <br />