FLOOD09931

• County: Statewide
• Community: Urbanizing Areas of Colorado
• Basin: Statewide
• Title: A Guide for Erosion & Sediment Control in Urbanizing Areas of Colorado
• Date: 1/1/1973
• Prepared For: State of Colorado
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Educational/Technical/Reference Information

cfs

....
'"

15
20
25
30
35
40
45
50
55
60
65
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75
80
90
100
110
120
130
140
150
160
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220
240
260
280
300

Q

V1 - 2.0

T D V2

30 1.6 0.8
39 1.6 0.8
49 1.6 0.8
59 1.6 0.8
68 1.6 0.8
78 1.6 0.8
88 1.6 0,8
97 1.60.8

V1 Based on Permissible Velocity of the Soil With Retardance ,,~,

Top Width, Depth & V2 Based on Retardance "W'

V1 = 2.5

T D V2

18 1.8 1.2
24 1.8 1.2
30 1. 7 1.2
35 1. 7 1.2
41 1. 7 1.2
47 1. 7 1.2
531.7 1.2
591.7 1.2
641.7 1.2
701.7 1.2
761.7 1.2
81 1. 7 1.2
87 1.7 1.2
93 1.7 1.2

V1 = 3.0

T D V2

13 1.9 1.4
17 1.9 1.5
21 1.9 1.5
25 1.9 1.5
29 1.9 1.5
34 1.9 1.5
38 1.9 1.5
42 1.9 1.6
46 1.8 1.6
50 1,8 1.6
54 1.8 1.6
58 1.8 1.6
62 1.8 1.6
68 1.8 1.6
74 1.8 1.6
83 1.8 1.6
91 1.8 1.6
99 1.8 1.6

T = Top width, Retardance "B"
D = Depth, Retardance "B"
V2 = Velocity, Retardance "B"
V1 = Velocity, Retardance "0"

(Settlement to be added to
top of ridge.)

V1 = 3.5

T D V2

92.11.8
122.0 1.9
15 2.0 2.0
18 2.0 2.0
21 2.0 2.0
23 2.0 2.0
26 2.0 2.0
292.02.0
32 2.0 2.0
35 2.0 2.0
38 2.0 2.0
412,.0 2.1
43 2.0 2.1
462.02.1
52 2.0 2.1
58 2.0 2,1
63 2.0 2.1
69 2.0 2.1
75 2.0 2.1
80 2.0 2.1
86 2.02.1
91 2.0 2.1
97 2.0 2.1

V1 = 4.0
T D V2

11 2.2 2.4
13 2.1 2.5
152.1 2.5
17 2.1 2.5
19 2.1 2.5
21 2.1 2.6
23 2.1 2.6
25 2.1 2.6
27 2.1 2.6
29 2.1 2.6
312.12.6
33 2.1 2.6
37 2.1 2.6
41 2.1 2.6
45 2.1 2.6
492.12.6
53 2.1 2.6
57 2.1 2.6
612.12.7
652.12.7
692.12.7
732.1 2.7
77 2.1 2.7
812.1 2.7
892.12.7
97 2.1 2.7

V1 = 4.5
T D V2

10 2.3 2.8
12 2.2 2.9
14 2,2 2.9
15 2.2 2.9
17 2.2 2.9
19 2.2 2.9
20 2.2 3.0
22 2.2 3.0
24 2.2 3.0
25 2.2 3.0
27 2.2 3.0
30 2.2 3.0
34 2.2 3.0
37 2.2 3.0
40 2.2 3.0
44 2.2 3.0
47 2.2 3.0
50 2.2 3.0
53 2.2 3.0
'J7 2.2 3.1
60 2.2 3.1
63 2.2 3.1
66 2.2 3.1
73 2.2 3.1
79 2.2 3.1
86 2.2 3.1
92 2.2 3.1
99 2.2 3.1

V1 = 5.0
T D V2

10 2.4 3.0
11 2.4 3.2
132.4'3.2
14 2.4 3.2
15 2.4 3.3
17 2.4 3.3
18 2.3 3.4
19 2.3 3.4
21 2.3 3.4
22 2.3 3.4
25 2,3 3.4
27 2.3 3.4
311> 2.3 3.4
33 2.3 3.4
35 2.3 3.4
38 2.3 3.5
41 2.3 3.5
43 2.3 3.5
46 2.3 3.5
49 2.3 3.5
51 2.3 3.5
54 2.3 3.5
59 2.3 3.5
65 2.3 3.5
70 2.3 3.5
75 2.3 3.5
81 2.3 3.5

Parabolic diversion design chart (Sheet 6 of 6)

Grade = 2.0%

V1 = 5.5
T D V2

10 2.6 3.5
11 2.5 3.6
12 2.5 3.7
13 2.5 3.7
152.5 3.7
16 2.5 3.8
17 2.5 3.8
18 2.5 3.8
20 2.5 3.8
22 2.5 3.9
24 2.5 3.9
26 2.4 3.9
29 2.4 3.9
31 2.4 3.9
33 2.4 3.9
35 2.4 3.9
37 2.4 4.0
39 2.4 4.0
41 2.4 4.0
44 2.4 4.0
48 2.4 4.0
52 2.4 4.0
56 2.4 4.0
61 2.4 4.0
65 2.4 4.0

V1 = 6.0
T D V2

10 2,7 4.0
11 2.7 4.0
12 2.7 4.1
132.74.1~
142.7 4.1 g;
15 2.6 4.2 ;:+.
17 2.6 4.2 '"
18 2.6 4.3
20 2.6 4.3
222.6 4.3
24 2.6 4.3
26 2.6 4.4
27 2.6 4.4
29 2.6 4.4
31 2.6 4.4
33 2.6 4.4
34 2.6 4.5
36 2.6 4.5
40 2.6 4.5
43 2.6 4.5
47 2.6 4.5
50 2.6 4.5
54 2.6 4.5