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

v.
o

Q Vl-2.O

cfs T D V2

15
20
25 11 2.9 1.6
30 132,81.7
35 152.8 1.7
40 17 2.8 1.8
45 192.7 1.8
50 21 2.7 1.8
55 23 2.7 1. 8
60 252.7 1.8
65 272.71.8
70 29 2.7 1.9
75 312.7 1.9
80 332.7 1.9
90 372.71.9
100 41 2.7 1.9
110 45 2.7 1.9
120 49 2,7 1. 9
130 53 2.7 1. 9
140 57 2.7 1. 9
150 61 2.7 1. 9
160 65 2.7 1.9
170 69 2.7 1.9
180 73 2.7 1. 9
190 77 2.7 1.9
200 812.7 1.9
220 89 2,7 1.9
240 97 2.7 1.9
260
280
300

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

Vl - 2.5
T D V2

11 3,2 2.1
13 3.1 2.2
14 3.1 2,2
15 3.1 2.3
17 3.0 2.3
18 3.0 2.3
19 3.0 2.3
21 3.0 2,3
22 3.0 2.4
25 3,0 2,4
28 3.0 2,4
30 3,0 2.4
33 3.0 2,4
36 3,0 2,4
38 3.0 2.4
41 3.0 2.4
44 3.0 2,4
46 3.0 2.4
49 3.0 2,4
52 3.0 2.4
55 3.0 2.4
60 3.0 2.4
65 3.0 2.5
71 3.0 2.5
76 3.0 2.5
82 3.0 2.5

Vl = 3.0
T D V2

14 3,6 2.7
15 3.5 2.8
16 3.5 2.8
17 3.5 2.8
19 3.5 2.9
21 3.4 2.9
23 3.4 2.9
25 3.4 2,9
27 3.,4 2,9
29 3.4 2.9
30 3.4 3.0
32 3.4 3.0
34 3.4 3.0
36 3.4 3.0
38 3.4 3.0
42 3;4 3.0
45 3.4 3.0
49 3.4 3.0
53 3.4 3.0
57 3.4 3.0

Vl = 3.5
T D V2

Vl = 4.0

Vl = 4.5
T D V2

T

D

21 5.1 4.3
22 5.1 4.3
24 5.0 4.4

Grade = 0.25%

Vl = 5.0
T D V2

Vl = 5.5
T D V2

T D V2

,-

16 4.1 3.3
18 4.1 3.3
19 4.0 3.4
20 4.0 3.4
21 4,0 3.4
23 4.0 3.4 18 4.5 3.8
24 4,0 3.5 19 4.5 3.8
25 4.0 3.5 20 4.5 3.9
27 3.9 3.5 21 4.4 3.9
29 3.9 3.5 23 4.4 3.9
32 3.9 3.6 25 4.4 4.0
34 3.9 3.6 27 4.4 4.0
37 3.9 3,6 29 4.4 4.0
40 3,9 3.6 31 4.3 4.1

..I

.-
_ 0.5 Freeboard
------
----

T - Top width, Retardance "t"
D - Depth, Retardance "C"
V2 - Velocity, Retardance "C"
Vl = Velocity, Retardance "11'

(Settlement to be added to
top of ridge,)

Parabolic diversion design chart (Sheet I of 6)

VI = 6.0
T D V2

t:<l
><
e:
e:
~
'"