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KIiAUS ANDERSON - NWN 5 VIEN <br />SCOTTI.AND GRL•GN POIlD= ANAI.YSIS Ol? F.f151'1NG CON DITIONS <br />F,%ISTINC LAND USG <br />Following is a breakdown of presen[ land use in the 266 acre <br />drainaoe area tribueary [o Scot[lanA Gceen Pond. The area of the <br />pond ia presently undeveloped, is partiaily marshy, vi[h the remainder <br />being idle upland in grasses and crces. 1'hc following table bzeaks <br />down land use for the watershed. <br />Percen[ 7'otal Area Area. <br />Land Use lm ervious Arca Imp. Perv. <br />Open Space ' 10 <br />Single Family Res. 27 <br />Mul[Lple ResidenCial 55 <br />CommeTCial 8 <br />T.H. 10 R041 40 <br />Clty Ha11 Proper[y 40 <br />130.) 13.6 122J <br />51.7 14.0 37.7 <br />21.7 11.9 9.8 <br />lZl 9.7 2.4 <br />26.0 10.4 15.6 <br />A.2 7.3 10.9 <br />To[als 266.0 66,9 199.1 <br />No[e [ha[ all areas are in acres. <br />I[ is assumed [ha[ approximately 5 acres of [he 199.1 acres of <br />pervlous area will Ue pond or open aa[cr are: and as such will have <br />100 percen[ runaff puten[ial. <br />On an overall drairtage area basie, the exie[ing cunditions percen[- <br />age impervlous is 66.9/266.0 0.25 or 25 percen[. <br />INFILTRATION IN TURF[?D ARF,AS <br />Soil [ypes Sn the area are sands having i iph infil[ration rates. <br />Such soils are commun all over tLe Ci[y. A uiajoz cct.o1. k4 Snfiltza- <br />9. :{^.pth [o wa[ ,nF,i:' g" E?- ihe pec-e taxm wu eY table is shallow <br />YnYlTtretion vill be lSmitzd try the cepecity of the soll. On the Kraue <br />Mdereon property (the major pervious area), the wnter table Se nocmally <br />more than slx feet in dep[h. <br />Infiltrattan is es[imated in [wo wnys: <br />a. SCS Curve Num6er: <br />From the SCS Ilydrology manual, curve:: are given that relate <br />ratn(all and runuCf for various soil types. We asswned that the <br />pervinus are: ::otls would Ee 2immettnnn Solls (Cl.ass A). From [he <br />S Cxblca for Cair pas[ure land (should be reasonably equlvelant <br />te lavns) ve sAould use curve number 49. Use Qi 50. <br />Foi Cn = 50 anJ a 100 ycar-24 huur ralnfall of 5.9 inehes <br />runoff should 6e npproximatcly 1_1 furhe_.