PERMFILE105841

• Permit No: C1981048
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT V-3
• Media Type: D
• Archive: No

• CULVIIZT DESIGN
Culvert No: C-4
Description: Culverts in main Del Pgua drainage
Peak Discharge: 386.63 cfs (See Below)
Design:
S= 5 percent
n= .017 roughness coefficient
42 p= x D
HH= .25 D
~(1.49/n) (A) (RH) 2/3 g .5
~(1.49/n) (.25) (3.14) D? (.25D) 2/3 5 .5
X0.47 D 2.6750.5
• n
2.6 4 n 2.67 ~ 386.63 (.013)
D = 0.4750'5 - .47 (05)'5
v
D =
2.67 47.76
(Two 5' pipe drains are installed)

= 4.52 feet
NOTE: Because of .basin size the upper I~1 ~a drainage will react
similar to the Apishapa Basin discussed in Section 4.5. 13moff
from a „,~X;,m ~ rainfall event is determined to be 35.7 cfs/
square miles. 'Ii~ere are 10.83 srn miles in the Del Agua
Hasin yielding a peak flow of 386.63 cfs at the culverts C-4.
Two five feet culverts are installed.