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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Q VI = 2.0
cfs T D V2

15
20
25
30
35
40
45
50
55
60
65
70
75
80
90
100
110
120
130
140
150
160
170
180
190
200
220
240
260
280
300

16 1.6 1.5
22 1.6 1.5
27 1.6 1.5
32 1.6 1.5
37 1.6 1.5
43 1.6 1.5
48 1.6 1.5
53 1.6 1.5
58 1.6 1.5
64 1.6 1.5
69 1.6 1.5
74 1.6 1.5
79 1.6 1.5
84 1.6 1.5
95 1.6 1.5

VI Based on Permissible Velocity of the Soil With Retardanee "U'
Top Width, Depth & V2 Based on Retardanee "C' Grade = 1.0%

VI = 2.5

T D V2

10 1.8 2.0
13 1.82.1
17 1.82.1
20 1. 8 2.1
23 1.8 2.2
26 1.8 2.2
29 1.8 2.2
33 1.8 2.2
36 1.8 2.2
39 1.8 2.2
42 1.8 2.2
45 1.8 2.2
49 1.8 2.2
52 1.82.2
581.82.2
65 1.8 2.2
71 1.8 2.2
77 1.8 2.2
84 1.8 2.2
90 1,8 2.2
96 1.8 2.2

VI = 3.0
T D V2

11 2.0 2.6
13 2.0 2.7
15 2.0 2.8
17 1.9 2.8
19 1.9 2.8
22 1.9 2,8
24 1.9 2.8
26 1.92.8
28 1.92.8
30 1.9 2.8
32 1.92.9
34 1.9 2.9
38 1. 9 2.9
43 1.9 2.9
47 1.9 2.9
51 1.9 2.9
55 1.9 2.9
59 1.9 2.9
64 1.92.9
681.92.9
72 1.9 2.9
76 1.9 2.9
80 1.92.9
84 1.92.9
93 1. 9 2.9

VI = 3.5
T D V2

11 2.1 3.0
12 2.1 3.1
14 2.1 3.1
16 2.1 3.2
17 2.1 3.2
19 2.0 3.3
21 2.0 3.3
22 2.0 3.3
24 2.0 3.3
26 2.0 3.3
27 2.0 3.3
31 2.0 3.3
34 2.0 3.3
37 2.0 3.3
41 2.0 3.3
44 2.0 3.3
47 2.0 3.3
51 2.0 3.3
54 2.0 3.3
57 2.0 3.3
61 2.0 3.4
64 2.0 3.4
67 2.0 3.4
74 2.0 3.4
81 2.0 3.4
87 2.0 3.4
94 2.0 3,4

VI - 4.0
T D V2

102.33.7
12 2.3 3.7
13 2.3 3.7
14 2.3 3.8
15 2.2 3.8
17 2.2 3.8
18 2.2 3.9
19 2.2 3.9
20 2.2 3.9
23 2.2 3.9
252.2 3.9
28 2.2 3.9
30 2.2 4.0
33 2.2 4.0
35 2.2 4.0
38 2.2 4.0
40 2.2 4.0
43 2.2 4.0
45 2.2 4.0
48 2.2 4.0
50 2.2 4.0
55 2.2 4.0
60 2.2 4.0
65 2.2 4.0
70 2,2 4.0
75 2.2 4.0

VI = 4.5
T D V2

10 2.5 4.2
11 2.5 4.3
12 2.5 4.3
13 2.5 4.3
14 2.5 4.4
15 2.5 4.5
16 2.5 4.5
17 2.4 4.5
19 2.4 4.5
21 2.4 4.5
23 2.4 4.5
25 2.4 4.5
27 2.4 4.5
29 2.4 4.5
30 2.4 4.5
322.44.5
34 2.4 4.5
36 2.4 4.5
38 2.4 4.5
42 2.4 4.5
45 2.4 4.5
49 2.4 4.5
53 2.4 4.5
57 2.4 4.5

VI - 5.0
T D V2

VI = 5.5
T D V2

VI = 6.0
T D V2

T = Top Width, Retardance "C'
D = Depth, Retardance "C'
V2 = Velocity, Retardance "C'
VI = Velocity, Retardance "U'

(Settlement to be added to
top of ridge.)

102.74.7
112.74.7
12 2.7 4.7
13 2.7 4.9
142.74.9 12 2.9 5.2
162.74.9 132.95.3
172.65.0 142.95.3 12 3.1 5.7
192.6 5.0 16 2.9 5.4 13 3.1 5.7
202.6 5.0 172.95.4 14 3.1 5.8
22 2.6 5.0 18 2.8 5.5 15 3.1 5.8
23 2.6 5.0 192.8 5.5 17 3.1 5.8
25 2.6 5.Q 20 2.8 5.5 18 3.0 6.0
26 2.5 5.0 22 2.8 5.5 19 3.0 6.0
28 2.6 5.0 23 2.8 5.5 20 3.0 6.0
29 2.6 5.0 24 2.8 5.5 21 3.0 6.0
31 2.6 5.0 25 2.8 5.5 22 3.0 6.0
34 2.6 5.0 28 2.8 5.5 24 3.0 6.0
37 2.6 5.0 30 2,8 5.5 26 3.0 6.0
40 2.6 5.0 33 2.8 5.5 28 3.0 6.0
43 2.6 5.0 36 2.8 5.5 30 3.0 6.0
46 2.5 5.0 38 2.8 5.5 32 3.0 6.0

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Parabolic diversion design chart (Sheet 4 of 6)