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Ek <br /> -7n7 <br /> 4. HYDRA(.•' <br /> I i"L1CS OF CULVERTS <br /> 161 <br /> I size is satisfactory for the full 10 <br /> v <br /> If the headwater is too high, a lar <br /> 'a <br /> g a7f�tR-•�`�•;to the maximum permissible hcads�, <br /> trol, as follows. <br /> selected for inlet control enter Fig, s"' - 10,000 <br /> ►� ? 8,000 LOSS COEFFICIENT Ke <br /> headwater depth in outlet c a <br /> (l) <br /> ontrol. tr I% FOR VARIOUS ENTRANCE (2) <br /> inlet control, the culvert is assumed to kv 5 5,00p TYPES 6• <br /> ath applies. 44 4,000 HW ENTRANCE 5. 6 (3) <br /> D SCALE TYPE COEFFICIENT <br /> e stated on the flow charts. For c iw 2 3,000 6 <br /> 5. <br /> :for length,L',calculated by the formaaq a He iisn",ep edge,ar End 0 5 <br /> '2 0 'tost,p. conforming ro f ll 5 <br /> p 2,000 slope 4- <br /> �-- 108 E: (21 <br /> Mitered to conform to slope 07 <br /> o (3) Projecting from fill 09 3. 4 <br /> . .. . . . . . . .. . . .. . . .. .. .. . . ... tlfj - 96 1,000 3 <br /> ✓r Soo 3. <br /> _ To use scale 2)or 131 oroiev <br /> ' 84 600 horizontally to scale 0,then <br /> 500 use straight mcuaed line through 2. <br /> _ D and O scoies,or reverse as <br /> 400 illustrated <br /> ng's n 72 i 2 2 <br /> shown on chart. 300 — <br /> 3 1.5 <br /> 60 V 200 = 1.5 <br /> 1.5 <br /> e charts, adjust the result for the fan. _ <br /> 54 �} `v <br /> = too E <br /> ted for the entrance condition desired 6,_ m 60 0 <br /> ble page 156. s 60—— �zpM�lE <br /> ip <br /> o -42 -5 50 r 1 0 1 0 <br /> ad headwater exceeds the allow'abk, - 40 0 10 <br /> onding to acceptable headwater depth. ExAMPLE ---§_ <br /> ould be considered for corrugated steel o -36 3o Dam 1D:=ae =� <br /> 3cients. See Table 4-10. A smaller size ___ 9afo cfs___ ; 9 <br /> 33 20 0 <br /> satisfactory. 30 tale HW = 6 e <br /> D' 8 <br /> considered. It may be economical to N " )0 40ft -- - <br /> nned if a size difference results. Check � 27 a 3; ;,° 4 0, .7 7 <br /> 3 24 6 .7 <br /> f Manning's n for Structural Plate Pipe 5 <br /> measurements reported in Table 4-I I 21 4 6 - -- <br /> .6 <br /> 4-24 and 4-25 together with the corre- 3 s <br /> This data was not a part of the Fed- j 6 <br /> which were published in 1963. 2 <br /> 5 <br /> .5 <br /> 1.0 5 <br /> ITS HEADWATER DEPTH FOR <br /> r and 100-year flood discharge. Ob- <br /> 2 CORRUGATED STEEL PIPE CULVERTS <br /> of less importance which do not war- WITH INLET CONTROL <br /> )r design discharges for less critical <br /> 10-year floods. This is a matter of <br /> •ction A of this chapter. But,whatever <br /> sign discharge,the rationale presented <br /> nav be balanced by requiring no static Fig. 4.18. Inlet control nomograph for corrugated steel pipe culverts. The manufac-flood discharge than the design dis- turers recommend keeping HWID to a maximum of 1.b and preferably to no more <br /> than 1.0. <br /> PV- - C:r-„�'�'.' � ..iY,y:r_ i �• 33,, �' :$�. N :Y*•r.:t;>��-^ _ 'k.l..,.y 9„�%1..•• :}:a'.'i�'�:-..L..t.. _ -`.�',i <br />