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i deprea- <br />a initiel <br />impervious <br />Ls flVall- <br />tion to <br />,an annuel) <br />rever, both <br />: larger, <br />i hae e ON <br />�re runoff <br />�tes of <br />al wnter- <br />ipated fu- <br />ting on <br />:t onto im-' + <br />�ees where '�+ <br />rithin e �{ <br />Same areas <br />�U8B8 IDUBL <br />whether <br />atural con-, <br />ttle ood , <br />�ubaurfece <br />�y one of <br />or B to be <br />;he country, <br />a the mois- <br />�nditione. <br />land use <br />ypicel land <br />y be used <br />the criterie <br />, aPP�V• The <br />.dentisl a� <br />.y from the <br />CN can be <br />impervious <br />r LhA 1IDpe='�' <br />. <br />� ������ti ��-�� <br />2-2a. (:ast 3nnton) —%�noff eurve mmber�` i <br />bar. l+�ot ase. Fur use in Tvoe i� A�Sti^ Dic <br />'r` i �(�� G�-��i�+ �� ✓1 �� <br />� <br />aro use DESCRIP2ION <br />;:ulGivated land =' . Winter Condition <br />:�aun:aln Open Areas - Lo�+ Grwt.ng Brush and <br />Grass Lands <br />icckeA eqricultural,/suhurban, and <br />ion I.rna. A <br />7L�-"+'�'�! N / <br />HYDROfAGIC SOIL GROUP <br />A fr ' C • 0 <br />; , <br />^!eadow or Pasture <br />Wood ar Forest Lend: Orcha:d vith rnver crop <br />:'ir Forest - good covcr �� - <br />. Undisturbed <br />Young second yrowth or brush <br />Open spaces, lawns, parks, golf caurses, cemeterie <br />etc. <br />qood condition: grass cover an 75'. or more of <br />the area <br />fair conditions qrass cwer on 503 to 75► of <br />the eree <br />Commerciel end business areas (85! Sr,iper�ious) <br />Induatrial districta f75� impescious) <br />Residential:� <br />Average lot size Aonraqo '• ImPervious=� <br />I/8 acre or less 35 ' <br />1/4 acre 38 <br />1/3 acre �� . <br />1/2 acre . 25 <br />1 acre �� <br />Paved parkinq lot�, roofe, drivevaye, ete.� <br />Etreeta and Roadss <br />77 91 94 95 <br />74 82 B9 92 <br />65 76 85 B9 � <br />Bl 88 92 94 � <br />4Z 64 76 81 <br />48 69 79 85 . <br />� <br />68 <br />77 <br />92 <br />88 <br />60 <br />85 <br />94 <br />92 <br />86 <br />90 <br />95 <br />94 <br />90 <br />92 <br />96 ; <br />95 <br />86 90 I 93� 95 ' <br />77. 85 90 92 <br />75 84 �H9 91 <br />73 83 88 91 <br />71 B7 BB 90 ' <br />98 98 98 98 <br />peved �lth curbs and atom aevera=' 98 98 98 98 <br />aravel 76 85 B9 91 <br />airt �z ez e� e9 <br />1_/ For a r..cze _eteiled deseription of eqricultuzel land use curve numbera refer to <br />l:ational Er.;ineering Hendbook, Sec:ion 4, Ilydrology, Chapter 9, Auq. 1972. <br />2/ <br />Cood cover is pro=octed from gracir.g and li:tar and brush cover toil. <br />�/ <br />Curve numbera ere coroputed asauminq the runof: from the house and drivavay <br />is directed to�arda the etreet with a minitsum of roof wetez directed tn law�ne <br />�Tr.re ad3l:ional infiltration enuld occur. <br />�� The reneining pesvious areas (lewn) are considered to be in qood pastu:e condition <br />for :hese cnrva numbers. <br />In r.ome waraer cliRates of the cour.[ry e curve number of 95 mey he une�f. <br />Mote: The underlined CII's erc belov the values in ES-1029 eherte. Use CN 60 fur <br />the�e condltions unleas the ;ob w•arrants computing the peak dischar��e by <br />speclal proccdures. <br />