Laserfiche WebLink
JULY 1, 1963 DRAINAGE MANUAL TAB. A 5-294.222 <br />ROOFS <br />PAVEMENTS <br />R.R. YARDS <br />EARTH <br />SURFACES <br />COMPOSITE <br />AREAS <br />COEFFICIENT OF RIINOFF - C <br />(for use with ralion.0 formula). <br />�ut(rA�ea <br />A;1 Kinds <br />Portland C-ment or As,:hil is Conr-ale <br />Bitu.Titu+um, open y,adeI jr cracked <br />Gravel, f,om clean .and !oos-� to clayey and hard. <br />MIN. MAX, <br />0.90 1.00 <br />0.90 1.00 <br />0.70 0.90 <br />0.25 0 70 <br />0.10 <br />0.30 <br />SAND, from uniform grain <br />p�1�.__ _ _ <br />0.15 <br />0.50 <br />size, no fines, to well <br />Ligh4_Ye!getattpp <br />0.10 <br />0.40 <br />graded, some sill and clay, <br />j)cnse�j(enetation <br />0�05 <br />OL3Q <br />LUAM, from sandy or <br />Bare <br />0.20 <br />0.60 <br />gravelly to clayey. <br />-Dense <br />Light Vegetation <br />VrgrWtion0. <br />0.10 <br />05 <br />0.45 <br />0 <br />GRAVEL, from clean, no <br />Bnte___ <br />I 0.25 <br />0.65 <br />silt or clay, to high <br />LtguLYs9e18tign- <br />i 0.15 <br />0.50 <br />lLtDR'1 ! IjtYSr'►lts[It.__ <br />__ P!s� 'gtation <br />0.10 <br />0.40 <br />CLA.", frcm (oirse sandy <br />i DA.reV__ .____ _ <br />0.30 <br />0.75 <br />or to pure col- <br />I Li2r ; Venp;mmon <br />0.20 j <br />0.60 <br />AS014 <br />IOSrS�S�.Y• �_.. _. <br />__ • Vegetal n 1 0.15 0.50 <br />City, business arras <br />1 <br />0.60 <br />' <br />0.75 <br />City,dense resmdenm.nl, <br />i <br />0.35 <br />0. 5 <br />vary as to 5oml and <br />vegetation. <br />Suburban residential, <br />I <br />0.2f) <br />0.55 <br />vary as to soil ann <br />venatAt ion <br />Highway slopes and ditches, <br />0.20 <br />0.07 <br />vary as to soil and slope. <br />I <br />Parks, Golf Cou ses <br />0.10 <br />0.35 <br />etc., vary as to soil <br />and Vr•ge' 1tio'1 <br />t <br />Note: Value, of "C" foleari.h surfaces are further vaned by ifrntec of oatufation, GOT4Act4m. surface Irregularity <br />and slope, character of sub -,oil and by the oresence o! Irn-�t .w glazed snow or ice. <br />