by Jon LaHaye
On Saturday, April 3, water began flowing over the spillway at Kent Lake. With the spilling of Kent Lake, the district’s seven water supply reservoirs are now at 100 percent capacity. The last time that all of the reservoirs were filled to capacity was on April 22, 2006. The combined capacity of the reservoirs is 79,566 acre-feet*. The current water storage is about 110 percent of the average storage for this date.
The rainfall at Lake Lagunitas for the season to date is 50.27 inches, which is 106 percent of the average rainfall for this date. Considering it is only early April, there is a very good chance that the seasonal rainfall at Lake Lagunitas will exceed the average annual rainfall of 52 inches. The average monthly rainfall amounts at Lake Lagunitas in April and May are about 3.5 and 1.5 inches respectively.
The rainy season got off to an auspicious start in October with much above average rainfall. Other than November, which was quite dry, the monthly rainfall amounts have been close to the average values for the months of December through March. It looks like water year 2010 will go into the record books as a good year for water supply here in Marin County.
*One acre-foot is 325,851 gallons.