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

Q

VI = 2.0

v.
N

cfs T D V2

15 14 1.8 1.5
20 18 1.8 1.5
25 23 1.8 1.5
30 27 1.8 1.5
35 32 1.8 1.5
40 37 1.8 1.5
45 41 1.8 1.6
50 45 1.8 1.6
55 50 1.8 1.6
60 54 1.8 1.6
65 59 1.8 1.6
70 63 1.8 1.6
75 68 1.8 1.6
80 72 1.8 1.6
90 81 1.8 1.6
100 90 1.8 1.6
110 99 1.8 1.6
120
130
140
150
160
170
180
190
200
220
240
260
280
300

VI Based on Permissible Velocity of the Soil With Retardance "~'
Top Width, Depth & V2 Based on Retardance "C"

VI = 2.5
T D V2

10 2.0 2.2
13 2.0 2.2
15 2.0 2.2
18 2.0 2.3
20 2.0 2.3
23 2.0 2.3
25 2.0 2.3
282.02.3
30 2.0 2.3
33 2.0 2.3
35 2.0 2.3
38 2.0 2.3
40 2.0 2.3
45 2.0 2.3
50 2.0 2.3
55 2.0 2.3
60 2,0 2,3
65 2.0 2.4
70 2.0 2.4
75 2.0 2.4
80 2.0 2.4
85 2.0 2.4
89 2.0 2.4
94 2.0 2.4
99 2.0 2.4

VI = 3.0

T D V2

11 2.2 2.7
13 2.2 2.7
15 2.2 2.8
17 2.2 2.8
18 2.1 2.9
20 2.1 2.9
22 2.12.9
242.12.9
25 2.1 2.9
27 2.1 2.9
292.1 2.9
33 2.1 2.9
36 2.1 2.9
402.1 2.9
43 2.1 2.9
47 2.1 2.9
502.1 2.9
54 2.1 2.9
58 2.1 2.9
61 2.1 2.9
65 2.1 2.9
68 2.1 2.9
72 2.1 3.0
79 2.1 3.0
86 2.1 3.0
93 2.1 3.0

VI = 3.5

T D V2

10 2.4 3.1
11 2.4 3.2
13 2.3 3.2
14 2.3 3.3
16 2.3 3.3
17 2.3 3.3
18 2.3 3.3
20 2.3 3.3
212.3 3.3
23 2.3 3.3
25 2.3 3.4
282.3 3.4
31 2.3 3.4
34 2.3 3.4
36 2.3 3.4
39 2.3 3.4
42 2.3 3.4
45 2.3 3.4
47 2.3 :1.4
50 2.3 3.4
53 2.3 3.4
55 2.3 3.4
61 2.3 3.4
66 2.3 3.4
72 2.3 3.4
77 2.3 3.4
83 2.3 3.5

VI = 4.0
T D V2

102.7 3.7
11 2.6 3.8
12 2.6 3.8
13 2.6 3.8
14 2.6 3.9
15 2.6 3.9
16 2.6 3.9
18 2.6 4.0
20 2.6 4.0
22 2.5 4.0
24 2.5 4.0
26 2.5 4.0
28 2.5 4.1
30 2.5 4.1
32 2.5 4.1
34 2.5 4. 1
36 2.5 4.1
38 2.5 4.1
40 2.5 4.1
44 2.5 4.1
482.54.1
52 2.5 4.1
56 2.5 4.1
602.5 4.1

Grade = 0.75%

VI = 4.5

VI = 5.0

VI = 5.5
T D V2

T D V2

T D V2

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

(Settlement to be added to top
of ridge)

11 2.9 4.1
12 2.9 4.2
13 2.8 4.2
14 2.8 4.3
15 2.8 4.4 12 3.1 4.6
17 2.8 4.4 13 3.14.8
18 2.8 4.5 15 3.14.8
20 2,8 4.5 16 3.0 4.8 13 3.4 5.2
212.74.5 17 3.0 4.9 143.3 5.3
232.74.5 193.04.9 153.3 5.3
252.74.5 203.04.9 16 3.3 5.3
26 2.7 4.5 21 3.04.9 17 3.3 5.4
28 2.7 4.5 22 3.0 5.0 18 3.3 5.4
29 2.7 4.5 24 3.0 5.0 19 3.3 5.5
312.74.6 25 3.0 5.0 21 3.3 5.5
332.74.6 263.0 5.0 22 3.2 5.5
36 2.7 4.6 29 3.0 5.0 24 3.2 5.5
392.7 4.6 32 3.0 5.0 26 3.2 5.5
42 2.7 4.6 34 3.0 5.0 283.2 5.5
45 2.7 4.6 37 3.0 5.0 303.2 5.5
492.7 4.6 39 3.0 5.0 32 3.2 5.5

Parabolic diversion design chart (Sheet 3 of 6)

VI = 6.0

T D V2

trl
,.
:r
g:
~
""

14 3.6 5.8
15 3.6 5.8
16 3.6 5.9
17 3.6 5.9
18 3.6 5.9
19 3.6 5.9
21 3.6 6.0
23 3.6 6.0
24 3.5 6.0
26 3.5 6.0