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

44

Table 3.7.--Buckhorn dimensionless hydrograph

Rocky Mountain Thunderstorm
(Reclamation Flood Hydrology Manual Table 4-11, 1989)

% Lag+D/2

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

0 0.00 . 155 5.98 310 1.00 465 0.26
5 0.14 160 5.47 315 0.96 470 0.25
10 0.21 165 4.97 320 0.92 475 0.24
15 0.33 170 4.55 325 0.88 480 0.23
20 0.51 175 4.25 330 0.84 485 0.22
25 0.84 180 3.89 335 0.81 490 0.21
30 1. 62 185 3.59 340 0.77 495 0.20
35 3.74 190 3.34 345 0.74 500 0.19
40 6.38 195 3.13 350 0.71 505 0.18
45 8.61 200 2.93 355 0.68 510 0.17
50 10.94 205 2.75 360 0.65 515 0.17
55 13.26 210 2.61 365 0.62 520 0.16
60 15.70 215 2.44 370 0.59 525 0.16
65 18.23 220 2.31 375 0.57 530 0.15
70 20.76 225 2.17 380 0.55 535 0.15
75 23.30 230 2.04 385 0.52 540 0.14
80 25.83 235 1. 95 390 0.50 545 0.14
85 28.36 240 1.84 395 0.48 550 0.13
90 26.53 245 1. 76 400 0.46 555 0.13
95 24.71 250 1. 69 405 0.43 560 0.12
100 22.68 255 1. 62 410 0.42 565 0.12
105 20.76 260 1.55 415 0.40 570 0.11
110 18.84 265 1. 49 420 0.38 575 0.11
115 16.81 270 1. 42 425 0.36 580 0.10
120 14.99 275 1.36 430 0.35 585 0.10
125 12.86 280 1.30 435 0.33 590 0.09
130 11. 04 285 1.24 440 0.32 595 0.09
135 9.52 290 1.19 445 0.31 600 0.08
140 8.41 295 1.14 450 0.29
145 7.50 300 1.09 455 0.28
150 6.69 305 1.05 460 0.27