2011 Water Year (11/11/2011)

By: NWS Wichita

What is a Water Year?

 

 The water year is defined as the period between October 1 of one year through September 30th of the next in the Northern Hemisphere and July 1 through June 30 in the Southern Hemisphere.  This interval is often used by Hydrologists because hydrological systems are typically near their lowest levels at the beginning of the period.  According to the AMS Glossary of Meteorology, it commences with the start of the season of soil moisture recharge, includes the season of maximum runoff (or season of maximum groundwater recharge), if any, and concludes with the completion of the season of maximum evapotranspiration (or season of maximum soil moisture utilization).  For Wichita, the 2011 Water Year ranks as 9th driest since records began in 1888 or the driest in the past 21 years.

 

Rank

Value

Ending Date

1

13.84

09/30/1966

2

14.97

09/30/1956

3

15.63

09/30/1913

4

16.31

09/30/1953

5

17.09

09/30/1990

6

17.61

09/30/1946

7

17.81

09/30/1954

8

18.62

09/30/1936

9

19.08

09/30/2011

10

19.51

09/30/1988

 The table above represents the lowest total precipitation at Wichita over a 365 day period ending on September 30th of the indicated year.

 

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