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 V1 = 2.0

cfs T D V 2

15 102.1 1.6
20 13 2.1 1. 7
25 16 2.1 1. 7
30 20 2.1 1. 7
35 23 2.1 1. 7
40 26 2.1 1. 7
45 292.0 1.7
50 322.0 1.7
55 352.01.7
60 39 2.0 1. 7
65 42 2.0 1.8
70 45 2.0 1. 8
75 482.0 1.8
80 512.0 1.8
90 57 2.0 1.8
100 642.0 1.8
110 702.0 1.8
120 762.0 1.8
130 83 2.0 1.8
140 892.0 1.8
150 95 2.0 1.8
160
170
180
190
200
220
240
260
280
300

V1 Based on Permissible Velocity of the Soil With Retardance "D"

Top Width, Depth & V2 Based on Retardance "C:' Grade = 0.5%

V1 = 2.5
T D V2

10 2.4 2.1
12 2.4 2.2
14 2.4 2.3
16 2.3 2.3
18 2.3 2.3
20 2.3 2.4
22 2.3 2.4
24 2.3 2.4
26 2.3 2.4
282.32.4
30 2.3 2.4
32 2.3 2.4
35 2.3 2.4
39 2.3 2.4
43 2.3 2.4
47 2.3 2.4
51 2.3 2.4
55 2.3 2.4
59 2.3 2.4
62 2.3 2.4
66 2.3 2.4
70 2.3 2.4
74 2.3 2.4
78 2.3 2.4
86 2.3 2.4
93 2.3 2.4

V1 = 3.0
T D V2

92.7 2.5
11 2.6 2.6
12 2.6 2.7
13 2.5 2.8
15 2.5 2.8
16 2.5 2.8
18 2.5 2.8
19 2.5 2.9
21 2.5 2.9
22 2.5 2.9
23 2.5 2.9
26 2.5 2.9
292.5 2.9
32 2.5 2.9
35 2.5 2.9
38 2.5 2.9
41 2.5 2.9
44 2.5 2.9
46 2.5 2.9
49 2.5 2.9
52 2.5 2.9
55 2.5 2.9
58 2.5 2.9
64 2.5 2.9
69 2.5 2.9
75 2.5 2.9
81 2.5 3.0
87 2.5 3.0

V1 = 3.5
T D V2

11 2.9 3.2
12 2.9 3.3
13 2.93.3
14 2.9 3.3
15 2.8 3.4
16 2.8 3.4
17 2.8 3.4
19 2.8 3.4
21 2.8 3.5
23 2.8 3.5
25 2.8 3.5
27 2.8 3.5
29 2.8 3.5
31 2.8 3.5
33 2.8 3.5
35 2.8 3.6
37 2.8 3.6
39 2.8 3.6
41 2.8 3.6
45 2.8 3.6
49 2.8 3.6
53 2.8 3.6
57 2.8 3.6
61 2.8 3.6

V1 = 4.0
T D V2

12 3.2 3.7
13 3.2 3.8
15 3.2 3.8
16 3.1 3.9
18 3.1 3.9
19 3.1 3.9
21 3.14.0
22 3.1 4.0
24 3.1 4.0
25 3.1 4.0
27 3.1 4.0
293.14.0
30 3.1 4.0
32 3.1 4.0
35 3.1 4.0
38 3.0 4.1
41 3.0 4.1
44 3.0 4.1
47 3.04.1

V1 = 4.5
T D V2

V1 = 5.0
T D V2

V1 = 5.5
T D V2

V1 = 6.0
T D V2

T = Top Width, Retardance "C:'
D = Depth, Retardance "C:'
V2 = Velocity, Retardance "C:'
V1 = Velocity, Retardance "D"

(Settlement to be added to
top of ridge.)

m
"
or.
g:
~

13 3.5 4.1
14 3.5 4.2
15 3.4 4.3
17 3.4 4.4
18 3.4 4.3
19 3.4 4.4 15 3.8 4.8
20 3.4 4.4 16 3.8 4.8
22 '3.4 4.4 17 3.8 4.9
23 3.4 4.5 18 3.8 4.9
24 3.4 4.5 19 3.8 5.0
25 3.4 4.5 20 3.8 5.0 16 4.2 5.2
28 3.4 4.5 22 3.7 5.0 184.2 5.3
303.44.5 24 3.7 5.0 204.2 5.4
33 3.44.5 263.75.0 21 4.1 5.4
35 3.3 4.6 283.75.0 234.1 5.5 194.6 5.8
38 3.3 4.6 303.6 5.0 244.1 5.5 204.6 5.8

'"

Parabolic diversion design chart (Sheet 2 of 6)