PERMFILE66875

• Permit No: C1981016
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Sedimentation Control & Diversion Structure Calculations
• Section_Exhibit Name: APPENDIX XXI to Section XXI.8
• Media Type: D
• Archive: No

.Ditch S9zin9
(JEST MINE DIVERSION - WEST LIP16
1. Q = 15.3 cfs
2. Cross Section - shot June 11, 1981
Xl X2
Y
a ,B
A = Y2 tan Q(+ tan)
2
X1= Y tan Q(
X2= Y tan
CX = 67.38°
= 40, 03°
Y = 2.5'
X1= 6'
x2= 2.1'
3. A = Q = 15.3ft3/S = 3.83ft2
4.Oft/S 2/3
N = 1_5 (A 2/3 (S)~`_ 1_5 (3.84ft2) (0.128)2
V ( P ~ 4.Oft./5 (6.02.ft )
.099
A roughness of 0.11 could be accomplished by lining with shrub vegetation
or cobble sized gravel which would be nonerosive at velocity of 4.Oft/S
4. Freeboard
6' 2.1'
3.7' 1.29' 2.5'
• 1.54
2.5' - 1.54' = 0.96'