GREEN BOOK - Georgia Soil and Water Conservation Commission

6-216
GaSWCC (Amended - 2000)
Table 6-28.1. Design Chart for Parabolic Vegetated Diversion, Waterway or Stormwater Conveyance (Continued)
V1 FOR RETARDANCE “D”, TOP WIDTH (T), DEPTH (D), AND V2 FOR RETARDANCE “B”
Grade 6.00 Percent
Q
CFS V1=2.0 V1=2.5 V1=3.0 V1=3.5 V1=4.0 V1=4.5 V1=5.0 V1=5.5 V1=6.0
T D V2 T D V2 T D V2 T D V2 T D V2 T D V2 T D V2 T D V2 T D V2
5 12.4 0.7 0.8 8.7 0.8 1.0 6.2 0.9 1.4 4.7 1.0 1.6 3.5 1.2 1.9
10 24.7 0.7 0.8 17.6 0.8 1.0 12.8 0.9 1.4 9.8 0.9 1.7 7.8 1.0 2.0 6.2 1.0 2.3 4.9 1.1 2.7
15 37.1 0.7 0.8 26.4 0.8 1.1 19.2 0.8 1.4 15.0 0.9 1.7 11.8 0.9 2.0 9.5 1.0 2.4 7.7 1.1 2.7 6.2 1.2 3.1 5.0 1.3 3.5
20 49.4 0.7 0.8 35.1 0.8 1.1 25.6 0.8 1.4 19.9 0.9 1.7 16.0 0.9 2.0 12.9 1.0 2.4 10.4 1.0 2.8 8.5 1.1 3.2 7.0 1.2 3.6
25 61.8 0.7 0.8 43.9 0.8 1.1 32.0 0.8 1.4 24.9 0.9 1.7 19.9 0.9 2.0 16.1 1.0 2.4 13.1 1.0 2.8 10.8 1.1 3.2 8.9 1.2 3.6
30 74.1 0.7 0.8 52.7 0.8 1.1 38.4 0.8 1.4 29.9 0.9 1.7 23.8 0.9 2.1 19.3 1.0 2.4 15.9 1.0 2.8 13.0 1.1 3.2 10.8 1.1 3.6
35 86.5 0.7 0.8 61.5 0.8 1.1 44.8 0.8 1.4 34.8 0.9 1.7 27.8 0.9 2.1 22.5 1.0 2.4 18.5 1.0 2.8 15.4 1.1 3.2 12.7 1.1 3.6
40 98.9 0.7 0.8 70.2 0.8 1.1 51.2 0.8 1.4 39.8 0.9 1.7 31.8 0.9 2.1 25.7 1.0 2.4 21.2 1.0 2.8 17.6 1.1 3.2 14.5 1.1 3.6
45 111.2 0.7 0.8 79.0 0.8 1.1 57.6 0.8 1.4 44.8 0.9 1.7 35.7 0.9 2.1 29.0 1.0 2.4 23.8 1.0 2.8 19.8 1.1 3.2 16.6 1.1 3.6
50 123.6 0.7 0.8 87.8 0.8 1.1 64.0 0.8 1.4 49.7 0.9 1.7 39.7 0.9 2.1 32.2 1.0 2.4 26.4 1.0 2.8 22.0 1.1 3.2 18.4 1.1 3.6
55 135.9 0.7 0.8 96.6 0.8 1.1 70.4 0.8 1.4 54.7 0.9 1.7 43.6 0.9 2.1 35.4 1.0 2.4 29.1 1.0 2.8 24.2 1.1 3.2 20.2 1.1 3.7
60 148.3 0.7 0.8 105.3 0.8 1.1 76.8 0.8 1.4 59.7 0.9 1.7 47.6 0.9 2.1 38.6 1.0 2.4 31.7 1.0 2.8 26.3 1.1 3.2 22.0 1.1 3.7
65 160.6 0.7 0.8 114.1 0.8 1.1 83.2 0.8 1.4 64.7 0.9 1.7 51.6 0.9 2.1 41.8 1.0 2.4 34.3 1.0 2.8 28.5 1.1 3.2 23.8 1.1 3.7
70 173.0 0.7 0.8 122.9 0.8 1.1 89.6 0.8 1.4 69.6 0.9 1.7 55.5 0.9 2.1 45.0 1.0 2.4 37.0 1.0 2.8 30.7 1.1 3.2 25.6 1.1 3.7
75 185.4 0.7 0.8 131.7 0.8 1.1 96.0 0.8 1.4 74.6 0.9 1.7 59.5 0.9 2.1 48.2 1.0 2.4 39.6 1.0 2.8 32.9 1.1 3.2 27.4 1.1 3.7
80 197.7 0.7 0.8 140.4 0.8 1.1 102.3 0.8 1.4 79.6 0.9 1.7 63.5 0.9 2.1 51.4 1.0 2.4 42.2 1.0 2.8 35.1 1.1 3.2 29.3 1.1 3.7
85 210.1 0.7 0.8 149.2 0.8 1.1 108.7 0.8 1.4 84.5 0.9 1.7 67.4 0.9 2.1 54.7 1.0 2.4 44.9 1.0 2.8 37.3 1.1 3.2 31.1 1.1 3.7
90 222.4 0.7 0.8 158.0 0.8 1.1 115.1 0.8 1.4 89.5 0.9 1.7 71.4 0.9 2.1 57.9 1.0 2.4 47.5 1.0 2.8 39.5 1.1 3.2 32.9 1.1 3.7
95 234.8 0.7 0.8 166.8 0.8 1.1 121.5 0.8 1.4 94.5 0.9 1.7 75.4 0.9 2.1 61.1 1.0 2.4 50.2 1.0 2.8 41.7 1.1 3.2 34.7 1.1 3.7
100 247.1 0.7 0.8 175.5 0.8 1.1 127.9 0.8 1.4 99.5 0.9 1.7 79.3 0.9 2.1 64.3 1.0 2.4 52.8 1.0 2.8 43.9 1.1 3.2 36.6 1.1 3.7
105 259.5 0.7 0.8 184.3 0.8 1.1 134.3 0.8 1.4 104.4 0.9 1.7 83.3 0.9 2.1 67.5 1.0 2.4 55.4 1.0 2.8 46.1 1.1 3.2 38.4 1.1 3.7
110 271.8 0.7 0.8 193.1 0.8 1.1 140.7 0.8 1.4 109.4 0.9 1.7 87.3 0.9 2.1 70.7 1.0 2.4 58.1 1.0 2.8 48.2 1.1 3.2 40.2 1.1 3.7
115 284.2 0.7 0.8 201.9 0.8 1.1 147.1 0.8 1.4 114.4 0.9 1.7 91.2 0.9 2.1 73.9 1.0 2.4 60.7 1.0 2.8 50.4 1.1 3.2 42.0 1.1 3.7
120 296.6 0.7 0.8 210.7 0.8 1.1 153.5 0.8 1.4 119.3 0.9 1.7 95.2 0.9 2.1 77.2 1.0 2.4 63.3 1.0 2.8 52.6 1.1 3.2 43.9 1.1 3.7
125 308.9 0.7 0.8 219.4 0.8 1.1 159.9 0.8 1.4 124.3 0.9 1.7 99.2 0.9 2.1 80.4 1.0 2.4 66.0 1.0 2.8 54.8 1.1 3.2 45.7 1.1 3.7
130 321.3 0.7 0.8 228.2 0.8 1.1 166.3 0.8 1.4 129.3 0.9 1.7 103.1 0.9 2.1 83.6 1.0 2.4 68.6 1.0 2.8 57.0 1.1 3.2 47.5 1.1 3.7
135 333.6 0.7 0.8 237.0 0.8 1.1 172.7 0.8 1.4 134.3 0.9 1.7 107.1 0.9 2.1 86.8 1.0 2.4 71.3 1.0 2.8 59.2 1.1 3.2 49.3 1.1 3.7
140 346.0 0.7 0.8 245.8 0.8 1.1 179.1 0.8 1.4 139.2 0.9 1.7 111.0 0.9 2.1 90.0 1.0 2.4 73.9 1.0 2.8 61.4 1.1 3.2 51.2 1.1 3.7
145 358.3 0.7 0.8 254.5 0.8 1.1 185.5 0.8 1.4 144.2 0.9 1.7 115.0 0.9 2.1 93.2 1.0 2.4 76.5 1.0 2.8 63.6 1.1 3.2 53.0 1.1 3.7
150 370.7 0.7 0.8 263.3 0.8 1.1 191.9 0.8 1.4 149.2 0.9 1.7 119.0 0.9 2.1 96.4 1.0 2.4 79.2 1.0 2.8 65.8 1.1 3.2 54.8 1.1 3.7
RETARDANCE “D” AND “B”
NOTE: Width and Depth dimensions are in feet; Velocity measurements are in feet per second;
Depth “D” does not include allowance for freeboard or settlement.