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— . • I$/ <br /> 2-Sa <br /> — Table Z-2a.(Haahington) -- Runoft cuzve numbars for eelected agricultural, suburban, and <br /> ::zL•aa lar:�1 �sc. For use in T}�e IJ1 Storm Distribution 11raa. <br /> �,vtsri,r,v ,.,�,�_ �. <br /> . ..� <br /> HYDAOLOGIC SOIL GPOW <br /> L11ND USE D88C1tIpTipp A B C D <br /> Cultivai�d lu�d � � Nint�r Condition 77 91 9� 95 <br /> lbunlain Open �reas - Lcy Grorrinq Hrueh and 7� 82 89 92 <br /> - Gra�s Lands . <br /> lNadar or Pa�tur� . 65 7B 85 B9 <br /> Nood or For�it Lands Orchs,rd with covar crop B1 88 92 gq <br /> . Fir Tos��t - good oovar J - <br /> _ UMistusb�d 42 61 76 81 <br /> Youn9 �acond qrovlh or brwh �8 69 79 85 <br /> ' Open speoe�, lawne, pazks, golf couraea, cemateries, <br /> ^ etc. <br /> 9ood condition: gress cover on 75� or more o! <br /> � , tha ar�a 68 80 86 90 <br /> tair condition� gra�� covar on 50� to 75� of <br /> the araa . 77 85 90 92 <br /> ' ' Caianarcial und bu�in��e ar�u (85� imp�rvlou�) 92 94 � 95 96 <br /> ��' Indwtrial di�tricts (75! isparvious) 88 92 94 95 <br /> . � <br /> Aasidential:� 4, • <br /> - ]►v�rave lot dz� ]►wrave � In�rviou� <br /> 1/8 acra or l��s 65 ' B6 90 93 95 <br /> 1/� �cze 38 77 85 90 92 <br /> - 1/3 acra 30 75 84 89 91 <br /> 1/2 scr� 25 73 B3 8B 91 <br /> 1 acra 20 71 B2 88 90 <br /> Pawd parkinq lots, roofs, driv�way�, atc.� 9B 98 98 98 <br /> seraeta and Roada: S� <br /> - paved vith caeba and storm �avara� 98 98 98 98 <br /> gravel • 76 BS 89 91 <br /> ^- dirt �2 82 B7 89 <br /> " f Fos a mor� d���il�d d��cription o! aqrioultural 1�nA uu aurva n�r� r�l�r to <br /> Nationel 6ngin�aring Handbook, Saction 4, Hydrology, Chapter 9, 7►ug. 1972. <br /> � f Cood cover ia <br /> protected from grazing and litter and brush cover soil.. <br /> � � Curva number� are computad as�mninq tha runof! from ths hou�a and drivoway <br /> �. i• dirccted tovards tha etreat with a minimum o! roof water direoted to lawne <br /> where additionsl infiltration could occur. <br /> � � Th� remainin � <br /> g p�rviour area� (lawn) are considarad to b� in good pa�ture condition <br /> _ !or thsee curva aumber�, <br /> � <br /> J In eoaie wasmer climates of the country a cusva number of 95 may be used. , <br /> Not�: The wderlinad CN�s sre balow the valuas in ES-1029 charts. Uae CN 60 for <br /> thasa conditions unl��• the job werrant� coag�uting tha paak diacharge by <br /> apecial procadures, , <br />