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

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15
20
25
30
35
40
4S>
50
55
60
65
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100
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120
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300

Q

V1 = 2.0
T D V2
18 2.1 0.9
24 2.0 0,9
30 2.0 0.9
362.00,9
42 2.0 0.9
48 2.0 1.0
54 2.0 1.0
592.0 1.0
65 2.0 1.0
71 2.0 1.0
77 2.0 1.0
83 2.0 1.0
88 2.0 1.0
94 2.0 1.0

cfs

V1 Based on Permissible Velocity of the Soil With Retardance "~'

Top Width, Depth & V2 Based on Retardance "B"

V1 = 2.5

T D V2

11 2.3 1.2
15 2,2 1.3
19 2.2 1.3
22 2.2 1.4
26 2.2 1.4
29 2.2 1.4
33 2.2 1.4
37 2.2 1.4
402.2 1.4
44 2.2 1.4
47 2.2 1.4
51 2.2 1.4
54 2.2 1.4
58 2.2 1.4
65 2.2 1.4
72 2.2 1.4
79 2.2 1.4
86 2.2 1.4
94 2.2 1.4

V1 = 3.0
T D V2

102.5 1.7
122.5 1.7
15 2.4 1.8
17 2.4 1.8
19 2.4 1.8
22 2.4 1.8
242.41.9
262.41.9
292.4 1.9
31 2.4 1.9
33 2.4 1.9
362.4 1.9
382.41.9
432.4 1.9
472.41.9
52 2.4 1.9
572.41.9
612.41.9
662.41.9
71 2.4 1.9
752.4 1.9
802.4 1.9
84 2.4 1.9
892.41.9
94 2.4 1.9

V1 = 3.5
T D V2

10 2. 7 1. 9
12 2.6 2.0
14 2.6 2.1
15 2.5 2.1
17 2.5 2.1
19 2.5 2.2
21 2.5 2.2
23 2.5 2.2
25 2.5 2.2
26 2.5 2.2
28 2,5 2.2
30 2.5 2.2
34 2.5 2.2
38 2.5 2.2
41 2.5 2.3
45 2.5 2.3
49 2.5 2.3
52 2.5 2.3
56 2.5 2.3
60 2.5 2.3
63 2.5 2.3
67 2.5 2.3
71 2.5 2.3
74 2.5 2.3
82 2.5 2.3
89 2.5 2.3
96 2.5 2.3

V1 = 4.0
T D V2

10 2.9 2.4
12 2.82.5
13 2.8 2.5
14 2.8 2.5
16 2.8 2.6
17 2.7 2.6
182.72.6
202.72.6
212.7 2.7
232.72.7
252.72.7
28 2.7 2.7
31 2.7 2.7
342.7 2.7
362.7 2.7
39 2.7 2.7
42 2.7 2.7
452.7 2.7
47 2.7 2.7
502.72.7
532.72.7
55 2.7 2.7
612.72.7
662.7 2.8
72 2.7 2.8
77 2.7 2.8
83 2.7 2.8

V1 = 4.5
T D V2

11 3.1 2.9
12 j.1 2.9
13 3,0 3.0
14 3.0 3.0
15 3.0 3.0
16 3.0 3,1
17 3.0 3,1
19 3.0 3.1
21 3.0 3.1
23 2.9 3.2
25 2.9 3.2
27 2.9 3.2
29 2.9 3.2
31 2.9 3.2
33 2.9 3.2
35 2.9 3.3
382.93.3
40 2.9 3.3
42 2.9 3.3
46 2.9 3.3
50 2.9 3.3
54 2.9 3.3
58 2.9 3.3
62 2.9 3.3

Grade = 1.0%

V1 = 5.0
T D V2

V1 = 5.5
T D V2

V1 = 6.0
T D V2

T - Top width, Retardance "B"
D = Depth, Retardance "B"
V2 = Velocity, Retardance "W'
V1 = Velocity, Retardance "~'

(Settlement to be added to
top of ridge.)

11 3.4 3.2
12 3.3 3.3
13 3.3 3.4
14 3.2 3.4
16 3.2 3.5 13 3.5 3.8
17 3.2 3.6 14 3.4 3.9
19 3.2 3.6 16 3.4 3.9 13 3.7 4.1
213.2 3.6 17 3.44.0 153.74.2
22 3.1 3.6 18 3.4 4,0 16 3.6 4.3
23 3.1 3.6 203.44.1 17 3.6 4.3
263.13.7 213.44,1 183.6 4.4
27 3.1 3.7 22 3.44.1 193.6 4.4
29 3.1 3.7 24 3.4 4.1 203.6 4.5
31 3.1 3.7 25 3.3 4.1 21 3.5 4.5
32 3.1 3.7 26 3.3 4.2 22 3.5 4.5
34 3.1 3.7 28 3.3 4.2 24 3.5 4.6
37 3.1 3.7 303.3 4.2 26 3.5 4.6
41 3.1 3.7 33 3.3 4.2 28 3.5 4.6
44 3.1 3.8 363.34.2 303.54.7
47 3.1 3.8 383.3 4.2 33 3.5 4.7
503.1 3.8 41 3.3 4.2 35 3.5 4.7

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Parabolic diversion design chart (Sheet 4 of 6)