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PERMFILE135743
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PERMFILE135743
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Entry Properties
Last modified
8/24/2016 10:36:26 PM
Creation date
11/26/2007 3:51:57 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981032
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT C-17 CULVERT DRAINAGE BASINS CALCULATIONS SUPPORTING SIZING OF NORTHERN 1 HAUL ROAD CULVERT
Media Type
D
Archive
No
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5) Check culvert capacity. <br />• ~ = 1.0 Type 3 entrance. Inlet control governs. <br />D <br />6) Existing CMP is 18" Q. O. K. Use 15" 0 CMP. <br />CULVERT 5 Sta. 28 + 10 <br />1) QP = qAQ , <br />A = 2 Ac = .003 Mi.2 <br />2) Determine Tc. All overland flow. <br />.~- = hydraulic length = 450' <br />s = 8X <br />v =estimated velocity = 2 ft/sec (Fig. 3-1, Ref. 3) <br />Tt = Tc = S = 450 = 225 secs =..06 hrs. <br />v 2 <br />Use .1 hrs. <br />3) q = 1000 csm/in.2 runoff. (Graph Fig. 5-2, Ref. 3) <br />• 4) QP. = qAQ <br />_ (1000)(.003)(.46) <br />= 1 .4 cfs <br />5) Check hydraulic capacity <br />HW = 1.0 Type 3 Inlet control governs. (Ref. 41 <br />D <br />6) Existing CMP is~18". O.K. Use 12' Q CMP. <br />• <br />-6- <br />
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