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Eastern San Joaquin Groundwater Basin Groundwater Management Plan
<br />Northeastern San Joaquin County Section 2
<br />Groundwater Banking Authority 76 Hydrogeology
<br />The assumptions in Table 2-5 simplify the process of predicting future water demands. The
<br />analysis undertaken does in no way imply that other changes in urban development and
<br />agriculture are not likely, nor are the assumptions intended to discourage implementation of
<br />structural or policy changes that improve water use efficiency. For the purposes of the Plan,
<br />extensive analysis of the sensitivity of the assumptions on the projected water demand was not
<br />Table 2-5 Estimated and Projected Agricultural Water Demands
<br />(Applied Water Requirement under Average Conditions)
<br />District
<br />(Within San Joaquin County Only)
<br />1996 Estimated Applied Water
<br />Demand (af/yr)
<br />2030 Projected Applied Water
<br />Demand (af/yr)
<br />North Delta Water Agency 37,244 37,244
<br />Central Delta Water Agency 209,622 209,622
<br />South Delta Water Agency 206,759 206,759
<br />West Side ID 17,205 17,205
<br />City of Tracy 34,192 -
<br />Banta-Carbona 42,585 42,585
<br />Lathrop 21,225 -
<br />South Delta Area (Total) 321,966 266,549
<br />Del Puerto WD 15,529 15,529
<br />Plain View WD 11,217 11,217
<br />North San Joaquin WCD 88,022 88,022
<br />Woodbridge ID 102,517 102,517
<br />Lodi 5,124 -
<br />Stockton East WD 151,210 151,210
<br />Stockton 38,701 -
<br />SEWD (Total) 189,911 151,210
<br />Central San Joaquin WCD 159,554 159,554
<br />Oakdale ID 48,391 48,391
<br />South San Joaquin ID 126,709 126,709
<br />Manteca 21,663 -
<br />Escalon 1,761 -
<br />Ripon 9,508 -
<br />SSJID (Total) 159,641 126,709
<br />Unincorporated Areas 173,390 173,390
<br />Total 1,522,128 1,389,954
<br />Notes:
<br />1. This table was modified based on comments received on the Draft SJCWMP. It was compiled from the DWR land use
<br />information linked to Private, State and Federal water district outlines in a GIS system. There are significant areas of
<br />overlap between city limits, spheres of influence, and between water districts themselves. Bearing this in mind, there are
<br />bound to be variations and differences between these estimates and those compiled using different methodology. The
<br />figures in this table represent theoretical applied water requirements for average conditions.
<br />2. The quantity of water actually pumped, diverted and applied will be significantly different due to a variety of factors
<br />including distribution system inefficiencies and losses (ranging from 10 to 20 %), climate, soil conditions, etc. The loss of
<br />agricultural land to urban expansion is illustrated by the reduction in agricultural acreage currently located within urban
<br />spheres of influence.
<br />3. Agricultural lands in urban areas and urban spheres of influence are phased out completely by 2030. Other changes are
<br />likely to impact water demand, such changes in cropping patterns, irrigation methods, and farming of previously vacant
<br />land. However, these changes have not been quantified in any systematic or reliable basis.
<br />4. Urban development will be undertaken by increasing urban densities through infill of spheres of influence. Development
<br />according to this guideline has yet to gain market acceptance and widespread application in the County. However,
<br />current development patterns, and their associated average unit water usage rates, are assumed to apply in the future.
<br />5. Local urban development practices will result in new developments with similar water use rate. Water use figures were
<br />calculated for each individual urban area, and these figures were applied to future development. Each urban area has a
<br />unique unit water use rate based upon local factors, such as amounts of open space and conservation practices. As best
<br />management practices are implemented with respect to water conservation, projected water demands for urban
<br />developments may actually be conservative as compared to past conservation efforts.
<br />6. The urban spheres of influence reflect 2030 development. The urban spheres reflect the local plans for where expansion
<br />could occur in the future, but it is possible that the development will occur in different areas, or in different amounts than
<br />predicted. The State Department of Finance predicts future populations; the projected 2030 population can fit within the
<br />spheres at current urban densities.
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