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 Vl = 2.0
ds T D V2

24 1.8 0.9
32 1.8 0.9
391.80.9
47 1.80.9
55 1.8 0.9
63 1.8 0,9
701.80.9
78 1.80.9
86 1.80.9
93 1.80.9

..
00

Vl Based on Permissible Velocity of the Soil With Retardance ,,~'

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

Vl = 2.5
T D V2

15 1.9 1.2
201.9 1.2
25 1.9 1.2
31 1.9 1.2
36 1.9 1.2
41 1.9 1.2
46 1.9 1.2
51 1.9 1.2
55 1.9 1.2
601.9 1.2
65 1.9 1.2
701.9 1.2
75 1.9 1.2
80 1.9 1.2
90 1.9 1.2

Vl = 3.0

T D V2

10 2.2 1.5
14 2.1 1. 6
172.1 1.6
202.1 1.6
23 2.1 1. 7
272.1 1.7
30 2.1 1. 7
33 2. 1 1. 7
36 2. 1 1. 7
402.01.7
432.01.7
462.01.7
492.0 1.7
522.01.7
592.01.7
65 2.0 1. 7
72 2.0 1. 7
782.01.7
852.01.7
91 2.0 1. 7
972.01.7

Vl = 3.5
T D V2

Vl = 4.0
T D V2

Grade = 1. 5%

Vl = 4.5
T D V2

Vl = 5.0
T D V2

Vl = 5.5
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 T = Top width, Retardance "B"
190 D = Depth, Retardance "B"
200 V2 = Velocity, Retardance "B"
220 Vl - Velocity, Retardance ,,~,
240
26,0
280
300

11 2.3 2.1
13 2.3 2.2 11 2.4 2.4
162.2 2.2 132.42.5 102.62.7
18 2.2 2.2 14 2.3 2.6 12 2.5 2.8
20 2.2 2.2 16 2.3 2.6 13 2.5 2.8 10 2.8 3.2
22 2.2 2.2 18 2.3 2.6 15 2.5 2.9 11 2.8 3.3
242.22.3 202.3 2.6 162.52.9 12 2.7 3.4 103.03.5
26 2.2 2.3 21 2.3 2.6 17 2.5 2.9 13 2.7 3.4 11 3.0 3.6
292.22.3 232.32.6 192.53.0 142.7 3.4 12 2.9 3.7
312.2 2.3 252.32.6 202.53.0 152.73.4 132.93.8
33 2.2 2.3 26 2.3 2.7 22 2.5 3.0 162.7 3.5 14 2.9 3.8
352.22.3 282.32.7 232.53.0 182.7 3.5 15 2.9 3.8
392.22.3 322.32.7 262.53.0 202.73.5 162.83.9
442.22.3 352.32.7 292.43.0 22 2.7 3.5 182.84.0
482.2 2.3 392.3 2.7 31 2.4 3.0 24 2.7 3.5 202.84.0
522.2 2.3 42 2.3 2.7 342.43.0 262.63.6 222.84.0
57 2.2 2.3 45 2.3 2.7 37 2.4 3.0 282.6 3.6 23 2.8 4.0
612.2 2.3 492.32.7 402.43.1 302.63.6 252.84.0
652.2 2.3 522.32.7 432.43.1 322.63.6 272.84.0
69 2.2 2.3 56 2.3 2.7 45 2.4 3.1 34 2.6 3.6 29 2.8 4.1
742.2 2.3 59 2.3 2.7 48 2.4 3.1 37 2.6 3.6 302.84.1
78 2.2 2.3 63 2.3 2.7 51 2.4 3.1 39 2.6 3.6 32 2.8 4.1
82 2.2 2.3 662.3 2.7 542.43.1 412.6 3.7 34 2.8 4.1
862.2 2.3 692.32.7 562.43.1 432.63.7 362.84.1
95 2.2 2.3 762.3 2.7 622.43.1 472.63.7 392.84.1
832.32.7 682.43.1 51 2.6 3.7 432.84.1
902.32.7 73 2.4 3.1 552.63.7 462.84.1
97 2.3 2.7 792.43.1 602.6 3.7 502.84.1
842.43.1 642.63.7 53 2.84.1

Parabolic diversion design chart (Sheet 5 of 6)

(Settlement to be added to
top of ridge.)

Vl = 6.0
T D V2

tl1
"
11 3.1 4.0 ...
12 3.14.0 ~
13 3.1 4.2 '"
14 3.0 4.2
15 3.0 4.3
17 3.0 4.4
18 3.0 4.4
19 3.0 4.4
21 3.0 4.5
22 2.9 4.5
24 2.9 4.5
25 2.9 4.5
27 2.9 4.6
282.9 4.6
302.9 4.6
33 2.9 4.6
35 2.9 4.6
38 2.9 4.6
41 2.9 4.6
442.94.7