FLOOD10355

• County: Statewide
• Stream Name: Colorado River
• Title: Colorado River Basin Probable Maximum Floods, Hoover and Glen Canyon Dams
• Date: 9/1/1990
• Prepared By: US Department of the Interior Bureau of Reclaimation
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 3.6.--Southwest desert dimensionless hydrograph

Southwest Desert Great Basin and Colorado Plateau
(Reclamation Flood Hydrology Manual Table 4-13, 1989)

% Lag+D/2

Flow % Lag+D/2 Flow % Lag+D/2 Flow % Lag+D/2 Flow
(ft3/s) (ftJ/s) (ft3/s) (ft3/s)

0 0.00 135 9.04 270 1. 68 405 0.38
5 0.19 140 8.20 275 1.59 410 0.36
10 0.32 145 7.36 280 1. 50 415 0.34
15 0.48 150 6.78 285 1. 43 420 0.33
20 0.74 155 6.20 290 1.36 425 0.30
25 1.21 160 5.83 295 1.28 430 0.28
30 1. 81 165 5.47 300 1.21 435 0.27
35 2.63 170 5.15 305 1.15 440 0.26
40 3.68 175 4.84 310 1.08 445 0.24
45 5.47 180 4.57 315 1.02 450 0.23
50 8.41 185 4.31 320 0.97 455 0.22
55 12.61 190 4.10 325 0.91 460 0.21
60 16.50 195 3.87 330 0.86 465 0.20
65 20.50 200 3.68 335 0.82 470 0.19
70 23.97 205 3.47 340 0.78 475 0.18
75 27.75 210 3.28 345 0.74 480 0.17
80 28.91 215 3.10 350 0.69 485 0.16
85 28.07 220 2.93 355 0.66 490 0.15
90 26.38 225 2.75 360 0.63 495 0.15
95 24.18 230 2.63 365 0.59 500 0.13
100 21. 55 235 2.47 370 0.56 505 0.12
105 18.92 240 2.33 375 0.53 510 0.12
110 16.08 245 2.22 380 0.50 515 0.11
115 14.19 250 2.10 385 0.47 520 0.10
120 12.61 255 1. 99 390 0.45
125 11. 04 260 1. 88 395 0.42
130 9.99 265 1. 78 400 0.40