FLOOD06061

• County: Statewide
• Community: State of Colorado
• Stream Name: Colorado River/Great Basin
• Basin: Colorado Mainstem
• Title: Probable Maximum Precipitation Estimates, Colorado River and Great Basin Drainages
• Date: 1/1/1984
• Prepared By: COE
• Floodplain - Doc Type: Educational/Technical/Reference Information

Page
1000-mb ~lOO-kPa) 24-hr convergence PMP (inches) 2
2.13. for 10 mi
(26 km ) for September. . . . . . . . . . . . . . . . 30
2.14. 1000-mb ~lOO-kPa) 24-hr PMP (inches) for 10 .2
convergence m~
(26 km ) for October. . . . . . . . . . . . . . . 31
2.15. 1000-mb ~lOO-kPa) 24-hr convergence PMP (inches) for 10 .2
DU
(26 km ) for November . . . . . . . . . . . . . . 32
2.16. 1000-mb (lOO-kPa) 24-hr convergence PMP (inches) for 10 mi2
(26 km2) for December . . . . . . . . . . . . . . . . 33
2.17. Effective barrier and elevation heights (1000's of feet) for
Southwestern States . . . . . . . . . . . . . . . . . . . 35

2.18.

2.19.

2.20.

2.21.

2.22.

2.23.

2.24.

2.25.

2.26.

2.27.

2.28

2.29.

Percent of 1000-mb (lOO-kPa) convergence PMP resulting from
effective elevation and barrier considerations. . . . . .

37

Relation between 6/24-hr and 72/24-hr
cases of 3 consecutive day rainfall
in table 2.4. . . . . . . . .

ratios for within-storm
for all stations listed

40

Idealized depth-duration curves in percent of 24-hr amount.

42

Adopted 6/24-hr vs. 72/24-hr convergence PMP ratios

43

Seasonal variation of 6/24-hr ratios at least-orographic sub-
region midpoints. ......... ........

44

Seasonal variation of 6/24-hr durational rainfall ratios for
Southwest and adjacent regions. . .. .....

44

Smoothed variation of 6/24-hr ratios at subregional midpoints

45

Regional variation of 6/24-hr ratios by month (percent); Jan-
uary to April . . . . . . . . . . . . . . . . . . . .

47

Regional variation of 6/24-hr ratios by month (percent) ; May
to August . . . . . . . . . . . . . . . . . . . . . . 48
Regional variation of 6/24-hr ratios by month (percent);
September to December . . . . . . . . . . . . . . . 49

Depth-area variation for convergence PMP for first to fourth
6-hr increments; January to July. . . . . . . . . . . . . .

51

Depth-area variation for convergence PMP for first to fourth
6-hr increments; August to December . . . . . . . . . . . .

52

viii