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J / This project should develop about 55.009 acre-feet of \l\(ater during droughts to-augment SWP water supplies. As cur- rently proposed. tht~ project is anticipated ... to last about 40 years. , Conjunctive use ::>rojects include groundwater rechal'ge,and groundwater recovery componen:s. Recharge is typically . done with a series of infiltration ponds that . - - allow surf;ice water to percolate into the aquifer system. and recovery is done with a number of wells that extract water from the \ aquifer system., In the Sacramento Valley. geologic conditions are generally not con- ducive to rapid per~olation of :mrface.wa- ter. so in-lieu recharge is used. This will require delivery of SWP water to water dis- tri,cts in the project area that llse , c , , ~ groundwater, thereby reducing their_de- mands on the aquifer system.' Surface wa- ter facilities would need to be constructe~ to deliver SWP water &om the Feather River to the project participants' seivice areas. , In project feasibility studies. 1;he Sacr~ c . mento River Index has been used to'indi- cate when recharge and recovery would occur. The SRI is a measurement of the ,total uhimpaired flow of the Sacramento, Feather. Yuba. and Ameri€an rivers. and, is a reliable indicator of the overall sur- face water supply in the Sacramento River drainage basin during a specific year. For planning purposes, when the SRI is' classified as above normal or wet. ,project recharge would occur. When the SRI is '\ / / . . , Figure 1; Relative Piezometric Head Changes and Ground'Surface Displacement Sutler Extensometer I - - Q. W- "'9 'r"\ \ """ , I ~ , , IAj \~ J ~ !\ - ) M1 ~ ~ ~rn- 1 \VI \ ,......., ~ \\: " j It'I \. '" ~K , - I J " /" T I . ~ ~ I , , J '\, ./ - - I ~ - " . ' 1 , , -110'-120'Aquifer -185' -195' Aquifer . 295' - 305' Aquifer , 880' - 890' Aquifer -Relative Ground Surface Displacement I T 0,020 0,010 ~ . .! "if . E . 0,000 u ~ C. 0 i3 . u -!! -0,010 ~ <Il "C 0 ~ .e '" -0,020 ~ '" ~ ~ -0.030. -0,040 -15,0 Apr- Jun- Aug- Oct- Dec- Feb- Apr- Jun- Aug-. Oct- Dec- Feb- Apr-" Jun- Aug- Oct- 94 94 94 94 94 95 95 95 95 95 95 96 96 96 96 96 - 14 .