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 4 Storm Peak Discharge Calculations - Design Basins

Design Basin tc A 15 C5 BOO CIOO Q5 QlOO
Point (min) (ac) (in/hr) (in/hr) (cfs) (cfs)
I BI 20 69 2.4 0.47 4.3 0.65 77 189
2 B2 10 14 3.3 0.47 6.0 0.65 21 53
2A B2A 10 8 3.3 0.47 6.0 0.65 12 31
2B B2B 10 6 3.3 0.47 6.0 0.65 9 22
3 B3 11 25 3.1 0.47 5.8 0.65 37 94
3A B3A 10 2 3.3 0.47 6.0 0.65 4 9
B3B 11 23 3.1 0.47 5.8 0.65 33 86
B4 13 8 2.9 0.47 5.2 0.65 10 25
4A B4A 10 2 3.3 0.47 6.0 0.65 2 6
B4B 13 6 2.9 0.47 5.2 0.65 8 20
4B B4B,B5A 13 10 2.9 0.47 5.2 0.65 13 33
4 B4,B5A 13 11 2.9 0.47 5.2 0.65 15 38
B5 11 4 3.1 0.47 5.8 0.65 6 17
5A B5A 11 4 3.1 0.47 5.8 0.65 5 14
5B B5B 10 1 3.3 0.47 6.0 0.65 1 3
B6 10 3 3.3 0.47 6.0 0.65 5 13
6 B5B,B6 10 4 3.3 0.47 6.0 0.65 6 15
GI 10 5 3.3 0.47 6.0 0.65 8 21
G2 11 13 3.1 0.47 5.8 0.65 19 49
G3 13 61 2.9 0.47 5.2 0.65 83 206