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

t

Q Vl-2.O

ds T D V2

15
20
25 12 3.8 1.0
30 14 3.6 1. 1
35 17 3.5 1.1
40 19 3.5 1.2
45 21 3.4 1.2
50 23 3.4 1.2
55 26 3.4 1.2
60 28 3.4 1.2
65 30 3.4 1.2
70 32 3.4 1.2
75 34 3.4 1.2
80 37 3.4 1.2
90 41 3.4 1.2
100 46 3.4 1.2
110 50 3.4 1.2
120 55 3.4 1.3
130 59 3.4 1.3
140 64 3.3 1.3
150 68 3.3 1.3
160 73 3.3 1.3
170 77 3.3 1.3
180 82 3.3 1.3
190 86 3.3 1.3
200 91 3.3 1.3
220
240
260
280
300

VI Based on Permissible Velocity of the Soil With Retardance ,,~.

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

VI - 2.5
T D V2

134.1 1.4
14 4.0 1.4
163.9 1.5
17 3.9 1.5
193.91.5
20 3.8 1.6
22 3.8 1.6
23 3.8 1.6
25 3.8 1.6
28 3.8 1.6
313.7 1.6
343.7 1.6
37 3.7 1.6
403.7 1.6
43 3.7 1.7
463.7 1.7
493.71.7
52 3.7 1. 7
55 3.7 1. 7
58 3.7 1. 7
613.71.7
67 3.7 1.7
733.7 1.7
793.7 1.7
853.7 1.7
91 3.7 1. 7

VI = 3.0
T D V2

VI - 4.0
T D V2

VI - 4.5
T D V2

VI = 3.5
T D V2

1-.

T

D

VI = 5.0
T D V2

Grade = 0.25%

VI = 5.5
T D V2

VI - 6.0
T 1:: V2

..I
T
__..Q..5 Freeboard
-------

T - Top width, Retardance "B"
D = Depth, Retardance "B"
V2 = Velocity, Retardance "B"
VI - Velocity, Retardance ,,~.

15 4,5 1.8
164.4 1.9
17 4.4 1.9
194.3 1.9
21 4.3 2.0
23 4.2 2.0
26 4.2 2.0 18 5.0 2.3
28 4.2 2.0 19 4.9 2.4
30 4.2 2.0 21 4.9 2.4
32 4.2 2.0 22 4.8 2.5
34 4.2 2.0 24 4.8 2.5
36 4.2 2.1 25 4.8 2.5 20 5.5 2.8
384.2 2.1 264.7 2.6 21 5.42.8
404.2 2.1 284.7 2.6 22 5.42.8
42 4.2 2.1 294.7 2.6 23 5.3 2.9
464.2 2.1 32 4.7 2.6 25 5.3 2.9
504.12.1 354.7 2.6 27 5.2 3.0
544,12.1 384.72.6 295.2 3.0 22 6.03.3
594.1 2.1 404.6 2.6 31 5.1 3.1 24 5.9 3.4
63 4.1 2.1 43 4.6 2.7 33 5.1 3.1 26 5.9 3.4

Parabolic diversion design chart (Sheet 1 of 6)

tt1
,.
'"
9'
~

(Settlement to be added
to top of ridge.)

a-