Executive Update: Hydrologic Conditions in California

Executive Update

Hydrologic Conditions in California (07/01/2014)

Northern Sierra Precipitation Accumulation (1)
Rainfall & Snow Water Content (in inches)
 
Water Year Amount to Date (since Oct. 1, 2013): 28.85      
Average to Date: 48.60      
Percent of Average to Date: 59 %  
Average for the Water Year (Oct. 1 through Sep. 30) 50.00      
Percent of Average for the Water Year (Oct. 1 through Sep. 30) 58 %  

(1) Northern Sierra (Sacramento, Feather, Yuba, and American River Basins)

Snowpack Water Content
Region
Water Content
(in inches)
%
Avg to Date
%
April 1 Avg (2)
Northern Sierra ---                   ---                   ---                  
Central Sierra ---                   ---                   ---                  
Southern Sierra ---                   ---                   ---                  
Statewide ---                   ---                   ---                  

(2) April 1 is the date of normal maximum accumulation for the season.

Forecast of Regional Water Supply Indices (3)
Index Value Year Type
8 River Index for June (in 1000 AF)551.6       n/a
Sacramento Valley Water Year Type Index (40-30-30) @ 50%4.0       Critical
Sacramento Valley Water Year Type Index (40-30-30) @ 90%3.9       Critical
San Joaquin Valley Water Year Type Index (60-20-20) @ 50%1.2       Critical
San Joaquin Valley Water Year Type Index (60-20-20) @ 75%1.1       Critical

(3) For more information see Sacramento & San Joaquin Valley Water Year Type Index forecast: Latest | Previous
    (Issued monthly from December 1 through May 1)

Key Reservoir Storage As of 06/30/2014 midnight
Reservoir River Storage
(in 1000 AF)
Avg Storage
(in 1000 AF)
%
Average
Capacity
(in 1000 AF)
%
Capacity
Flood Control (4)
Encroachment
(in 1000 AF)
Trinity Lake Trinity 1,063   2,086   51   2,448   43   ---      
Shasta Lake Sacramento 1,851   3,650   51   4,552   41   -2,701      
Lake Oroville Feather 1,511   2,887   52   3,538   43   -2,027      
New Bullards Bar Res Yuba 591   830   71   970   61   -375      
Folsom Lake American 471   810   58   977   48   -506      
New Melones Res Stanislaus 717   1,532   47   2,400   30   -1,703      
Don Pedro Res Tuolumne 1,005   1,618   62   2,030   50   -1,025      
Lake McClure Merced 274   732   37   1,032   27   -730      
Millerton Lake San Joaquin 326   416   78   520   63   -195      
Pine Flat Res Kings 352   691   51   1,000   35   -648      
Isabella Kern 73   313   23   568   13   -288      
San Luis Res (Offstream) 655   1,293   51   2,041   32   ---      

(4) Temporary encroachment into seasonally reserved flood storage space; requirements can vary considerably on a daily basis due to numerous variables: rainfall amounts, anticipated snowmelt, time of year, soil moisture, etc.

Selected Cities Precipitation Accumulation As of 06/30/2014
  Jul 1 to Date
2014 - 2014
(in inches)
%
Avg
Jul 1 to Date
2013 - 2013
(in inches)
%
Avg
% Avg
Jul 1 to Jun 30
2014 - 2015
Eureka 21.11               52       32.31               80       52                  
Redding 17.77               51       28.46               82       51                  
Sacramento 9.79               53       15.20               82       53                  
San Francisco 12.54               53       16.61               70       53                  
Fresno 4.81               42       5.67               49       42                  
Bakersfield 2.41               37       3.15               49       37                  
Los Angeles 4.45               35       6.89               54       35                  
San Diego 5.06               49       6.50               63       49                  

  

Comments
As of June 30, statewide hydrologic conditions were as follows: precipitation, 50 percent of average to date, runoff, 35 percent of average to date, and reservoir storage, 60 percent of average for the date. Sacramento River Region unimpaired runoff, for Water Year 2014, observed through June 30, 2014 was about 6.5 million acre-feet (MAF), which is about 39 percent of average. In comparison to Water Year 2014, the observed Sacramento River Region unimpaired runoff through June 30, 2013 was about 11.2 MAF, or about 66 percent of average. On June 30, the Northern Sierra 8-Station Precipitation Index Water Year total was 28.9 inches, which is about 59 percent of the seasonal average to date and 58 percent of an average water year (50.0 inches). During June, the total precipitation for the 8-Stations was 0.1 inches, or about 10 percent of average for the month. Last year on June 30, the Water Year 2013 seasonal total for the 8-Stations was 44.2 inches, or about 91 percent of average. On June 30, the San Joaquin 5-Station Precipitation Index Water Year total was 19.2 inches, which is about 48 percent of the seasonal average to date and 47 percent of an average water year (40.8 inches). During June, the total precipitation for the 5-Stations was 0.0 inches. Last year on June 30, the Water Year 2013 seasonal total for the 5-Stations was 26.2 inches, or about 66 percent of average. The latest National Weather Service Climate Prediction Center (CPC) long-range, 1-month precipitation outlook for July 2014, issued June 30, 2014, suggests no tendency for above or below average rainfall for all of California, except for the extreme southeastern portion of the State where above average rainfall is suggested. Updates to the Executive Summary will generally be issued approximately weekly, biweekly, or monthly (depending on conditions) through the wet months of winter and spring. Beginning about June 1, this product is updated monthly through the dry seasons of summer and fall. The next update of this product will be issued about Monday, August 11, 2014, for conditions on August 1, unless there are significant hydrologic changes.


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