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3%ft-6 Pnnd <br />Table 2. --Acr.eptable PVC pipe fnr uce in earth damsl <br />_ Normal pipe. size Schedule fnr standard Maximum riep+h~ of <br />Dimpnsinn ra+io ($11R) fill nvFr nine <br />• <br />in ft <br />Schedule 40 10 <br />8, 10, 12 Schedule BO 1S <br />SDR 26 ]0 <br />1Polyvinyl chloride pipe, PVC 1120 or PVC 127.n, conforming to <br />ASTM-D-1785 or ASTM-D-2241. <br />Table 3. --Minimum gage. for corrugated metal pipe C2-2/3-in x ]/2-in <br />corrugations7l <br />Minimum gauge for Minimum thickness (in) <br />steel pipe with of aluminum pipet <br />Fill diamoter (in) of-- with diameter (in)~nf-- • <br />height 21 and 21 and <br />(f t) l ess 2d 30 36 42 a8 l ess 2G 30 "'6 <br />1 - 15 l0 16 16 14 12 10 n.06 0.06 0.075 0.0?=~ <br />15 - 20 16 16 16 14 12 10 .O6 .0?5 .105 .105 <br />20 - 25 I6 16 1G 12 ]0 ]0 .06 .)O;i iR~ <br />iPipe with 8-, and 10-in diameters has 1-1/2-in x 1/G-in corrugations. <br />ZRiveted or helical fabrication. <br />3Not permitTed. <br />Table 4 - Minimum spillway capacity <br /> Minimum design <br />? <br /> cT0 rr.• <br />Drainee= effective height of St orage Frequency Minimum <br />area r'am~ dur~=inn <br />acre ft ac re-ft yr hr <br />20 or less 20 or less Less than 50 ]0 24 <br />20 or less More than 20 Less than°•0 25 2d <br />More than 20 20 or less Less than ~0 2~ 2G <br />AI I gthorc =,() 2G <br />'As defined under "Scope." <br />ZSelect rain distribution based on climatological region. <br />• <br />SCS, Colorado, January 19!39 <br />