My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP11116
CWCB
>
Water Supply Protection
>
Backfile
>
11000-11999
>
WSP11116
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 3:16:10 PM
Creation date
10/12/2006 4:44:01 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8056
Description
Drought Preparedness
State
CO
Basin
Statewide
Date
2/1/1976
Author
Dept of Water Resour
Title
Special Report on Dry Year Impacts in California
Water Supply Pro - Doc Type
Report/Study
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
33
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />I <br />I <br />I <br />I <br />I <br />I <br />! <br />I <br />~ <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />303915 <br /> <br />Precipitation - The only month this y~ar that had good precip- <br />tat ion was October and unfortunately October, even at best, does <br />not produce very much water. November, December, and January have <br />all been dry over most of the State. One exception through <br />December was the Smith River in the northwest corner of the State. <br />In addition, some of the small coastal drainages to the south had <br />about normal precipitation until the first of January. An area <br />around Lake Tahoe had sufficient precipitation early in the year <br />to be near normal at the first of January but was well below <br />normal in snowpack since most of the precipitation fell as rain. <br />Even those fortunate areas fell below normal during January. Pre- <br />cipitation ranges from about a high of 80% of normal in the <br />extreme northwest to as low as 10% in Southern California as <br />shown on Figure 2, "Seasonal Precipitation, October 1, 1975 - <br />January 31, 1976." Precipitation at Central Valley Stations <br />ranges from about 30% of normal in the Southern San Joaquin <br />Valley to about 45% in the Northern Sacramento Valley. Precip- <br />tation in the Sierra Nevada is about 50% of normal at most <br />locations. <br /> <br />Reservoirs - The large reservoirs in the Sacramento Valley <br />have about 95% of the amount of water in storage that is <br />normal for this time of year and those in the San Joaquin <br />Valley about 105% of normal. This is about equal to the 10 <br />year average. Table 1 shows the amount of water in storage <br />in the reservoirs and a comparison with other dry years. <br /> <br />Snow Accumulation - The least favorable situation is the <br />scarce snowpack. The State depends on the melting snowpack <br />for water in many of the larger streams in the April through <br />July period. Snow accumulation is only about 25% of normal <br />for this date in the basins draining into the Sacramento Valley <br />and about 13% of normal in the San Joaquin basins. The snow- <br />pack for February 1, 1976 is shown in Table 2. Snow Surveyors, <br />even at some of the very high altitude snow courses, found <br />themselves carrying their skis and walking on dry ground during <br />the late January Snow Survey. <br /> <br />Soil Moisture - Storage of moisture in soil is less well known <br />than other forms of water storage but is of great importance to <br />dry farm agriculture and native vegetation. Grain planted <br />on land fallowed last spring in areas of higher rainfall, such <br />as Northern California, might attain normal yields if rain occurs <br />soon. Grain planted on land that was not fallow last summer <br />and therefore dependent only on the precipitation that has fallen <br />will not be worth harvesting in many areas. Deep rooted native <br />plants also have access to some moisture carried over from last <br />spring. Shallow rooted range grasses, however, depleted the <br />moisture within reach of their roots from last spring and have <br />only the water from this winter's precipitation, which has been <br />inadequate to maintain normal growth. <br /> <br />-3- <br />
The URL can be used to link to this page
Your browser does not support the video tag.