FLOOD08905

• County: Gilpin
• Community: Black Hawk
• Basin: South Platte
• Title: 1998 Black Hawk Flood
• Date: 9/8/1998
• Prepared For: Clear Creek County
• Prepared By: Consultants
• Floodplain - Doc Type: Flood Documentation Report

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Table 6 Slotted Drain Capacity Calculations

l2-m diameter CMP

Street Depth Vel Vel Pipe Full Design
Slope Head Discharge Capacity
(%) (ft) (ftIs) (ft) (cfs) (cfs)
I 0.8 2.8 0.1 1.9 1.9
2 0.7 3.9 0.2 2.7 2.3
3 0.6 4.6 0.3 3.3 2.3
4 0.5 5.5 0.4 3.9 1.9
5 0.5 5.5 0.5 4.3 2.2
6 0.45 5.7 0.5 4.7 2
7 0.4 5.9 0.5 5.1 1.7
8 0.4 6.3 0.6 5.5 1.8
9 0.35 6.2 0.6 5.8 1.5
10 0.3 6 0.6 6.1 1.2

24-m diameter CMP

Streel Depth Vel Vel Pipe Full Design
Slope Head Discharge Capacity
(%) (ft) (ftIs) (ft) (cfs) (cfs)
I 1.6 4.5 0.3 12 12
2 1.4 6.2 0.6 17 14.5
3 1.2 7.2 0.8 21 14.3
4 I 7.8 1 25 12.3
5 0.9 8.3 l.l 27 11.4
6 0.8 8.6 1.2 30 10.1
7 0.75 9 1.3 32 9.7
8 0.65 8.9 1.2 35 7.9
9 0.6 9.1 1.3 37 7.2
10 0.6 9.6 1.4 39 7.6