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�� <br />E� <br />Tet��hout dthe vaeterehedLore000eurein�centralnpaerte of theewaterehed ad <br />Ratio of dra nage ereentage of Stoim freauenoy (yesrs) <br />area to ponding ponding end Z 5 10 25 50 100 <br />end awampy erea awampy area <br />500 <br />200 <br />100 <br />50 <br />40 <br />30 <br />20 <br />15 <br />10 <br />5 <br />4 <br />0.2 <br />.5 <br />1.0 <br />2.0 <br />2.5 <br />3.3 <br />5.0 <br />6.7 <br />10.0 <br />20.0 <br />25.0 <br />0.94 <br />.88 <br />.83 <br />.78 <br />.73 <br />.69 <br />.65 <br />.62 <br />. se <br />.53 <br />.SO <br />0.95 <br />,89 <br />.84 <br />.79 <br />.74 <br />.70 <br />.66 <br />.63 <br />.59 <br />.54 <br />.51 <br />0.% <br />.90 <br />.86 <br />,81 <br />,76 <br />.71 <br />.68 <br />.65 <br />.61 <br />.56 <br />.53 <br />.97 <br />.91 <br />.87 <br />.83 <br />.78 <br />.74 <br />.72 <br />.69 <br />.65 <br />.60 <br />,57 <br />0.96 <br />.92 <br />.88 <br />.85 <br />.81 <br />.77 <br />.75 <br />.72 <br />.68 <br />.63 <br />.61 <br />0.99 <br />.94 <br />.90 <br />.87 � <br />.84 <br />.81 �� <br />.�8 <br />.75 ': <br />,71 <br />.68 :' <br />.66 '?' <br />Table E-4.--Adjustment featora vhere ponding and ewampy areae are lo- <br />ceted on�y in upper renches of the weterehed <br />t o o dra nege eroen e o Sto� freauenoY iYeere) <br />aree to ponding ponding end 2 S 10 25 50 100 <br />end svemPY area ewempy ar�s <br />S00 <br />zoo <br />100 <br />50 <br />40 <br />30 <br />20 <br />15 <br />10 <br />S <br />0.2 <br />.s <br />1.0 <br />2.0 <br />2.5 <br />3.3 <br />5.0 <br />6.7 <br />10.0 <br />20.0 <br />0.% <br />.93 <br />.90 <br />.87 <br />.85 <br />.82 <br />.80 <br />.78 <br />.77 <br />.74 <br />0.97 <br />.94 <br />.91 <br />.BB <br />.85 <br />.B3 <br />.B1 <br />.79 <br />.77 <br />.75 <br />0.98 <br />.94 <br />.92 <br />.BB <br />.86 <br />.84 <br />.82 <br />.80 <br />.78 <br />.76 <br />0.98 <br />.93 <br />.93 <br />.9U <br />.88 <br />.86 <br />.84 <br />.82 <br />.80 <br />.78 <br />0.99 <br />.% <br />.94 <br />.91 <br />.B9 <br />.88 <br />.86 <br />.84 <br />.82 <br />.80 <br />0.99 <br />.97 <br />.95 <br />.93 <br />.91 <br />.89 <br />.88 <br />.86 <br />.84 <br />.82 <br />These conditione msy xaux' in s Pz'�P�ed or esieting urban or euburbui <br />aree end the ad�uetment feotore lY�am tsblee E-2, E-3, or �-4 ehould be <br />applied efter the peake have been ed�ueted for the effeots of urbanise- <br />tion ae deecribed in chspter 4. <br />Fxam le E-3 <br />-acre pond !e lxated et the downstseem end of e 100-eare vaterehed <br />in which a houeing development ie pa'opoeed. The average vaterBt►ed elope <br />ie 4 percent and the preeent-aondition aurve number ie 75. AftRr the in- <br />etellation of the houeing development,dreulic�let th vill beeTmodifiedll <br />be impervious end 50 peroent of the hY � <br />The future-condition ourve number !e estimeted to be B0. For a rainfall <br />