Northern Prairie Wildlife Research Center
| Period |
Flow (CFS) |
Duration (Days) | Frequency (Yrs) Exceedence (%) | |
| Very Wet | Feb 1 - March 31 | > 16000* | 5** | 1 in 5 (20%) |
| Wet | Feb 15 - March 15 | > 12000* | 5** | 1 in 2.5 (40%) |
| Normal | Feb 15 - March 15 | > 3100 -3600 | 30 | 3 in 4 (75%) |
| Dry | Feb 15 - March 15 | 2000-2500 | 30 | all remaining (100%) |
*At least 50% of these pulse flows should occur during May 20 to June 20,
with May 1 to June 30 as the time frame for broadest benefit for channel maintenance,
and instream and wet meadow habitats. Occurrence between February 1 and June
30 would accomplish the necessary effects for channel maintenance. The 10-year
running average for the mean annual pulse flow targets should range from approximately
8,300 cfs to 10,800 cfs.
** The duration of these pulse flows should emulate the historic, natural
pattern: (a) ascended over approximately 10 days, (b) cresting for approximately
5 days, and (c) descending over approximately 12 days.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/habitat/plrivmgt/table15.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 04:53:30 EST
Menlo Park, CA [caww54]
