CHAPTER 5
SUPPLY AND DEMAND
5.1 Supply and Demand Provision
Law
10635 (a) Every urban water supplier shall include, as part of its urban water management plan, an assessment of the reliability of its water service to its customers during normal, dry, and multiple dry water years. This water supply and demand assessment shall compare the total water supply sources available to the water supplier with the total projected water use over the next 20 years, in five-year increments, for a normal water year, a single dry water year, and multiple dry water years. The water service reliability assessment shall be based upon the information compiled pursuant to Section 10631, including available data from the state, regional or local agency population projections within the service area of the urban water supplier.
10635 (b) The urban water supplier shall provide that portion of its urban water management plan prepared pursuant to this article to any city or county within which it provides water supplies no later than 60 days after the submission of its urban water management plan.
10635 (c) Nothing in this article is intended to create a right or entitlement to water service or any specific level of water service.
10635 (d) Nothing in this article is intended to change existing law concerning an urban water suppliers’ obligation to provide water service to its existing customers or to any potential future customers.
Section 5.1.1 Supply and Demand Comparison
Table 32 represents a supply projection and Table 33 provides demand projections at 5-year intervals.
Table 32Projected Normal Water Supply - AF/Y
2010 / 2015 / 2020 / 2025 / 2030
Supply / 34,576 / 34,850 / 34,850 / 34,850 / 34,850
% of Normal Year / 96% / 97% / 97% / 97% / 97%
Table 33
Projected Normal Water Demand - AF/Y
2010 / 2015 / 2020 / 2025 / 2030
Demand / 29,882 / 31,181 / 32,715 / 34,283 / 35,750
% of year 2005 / 96% / 100% / 105% / 110% / 115%
Table 34 represents a supply and demand comparison where demand does not fluctuate in conjunction with a change in supply. This table also indicates that in the average precipitation years, the City of Pomona has sufficient water to meet the needs of its customers through 2025. This is based upon imported water rights and groundwater storage agreements, an adequate supply of well water, and continued commitment to conservation programs. By 2030, it appears that the demand will exceed supply by about 900 acre-feet. What the 2030 supply value does not reflect is that there are additional well facilities currently being planned to increase pumping in the Six Basins, planning for increased usage of recycled water, and other efforts to increase other sources of supply.
Table 34Projected Supply and Demand Comparison - AF/Y
2010 / 2015 / 2020 / 2025 / 2030
Supply Totals / 34,576 / 34,850 / 34,850 / 34,850 / 34,850
Demand Totals / 29,882 / 31,181 / 32,715 / 34,283 / 35,750
Difference / 4,694 / 3,669 / 2,135 / 567 / (900)
Difference as % of Supply / 14% / 11% / 6% / 2% / -3%
Difference as % of Demand / 16% / 12% / 7% / 2% / -3%
Table 35 and Table 36 are reflective of the worst case scenarios, the City's water production is not affected significantly and this small shortage can be eliminated by increasing groundwater production in the Six Basins, increasing recycled water use, and implementing conservation measures. Table 37 offers a comparison of the estimates.
Table 38 through Table 49 provides dry year supply and demand projections as well as comparisons at yearly intervals. These tables indicate that should the dry years continue into the future, the gap between water supply and demand come closer together. As one can see, the shortage created by such an environment justifies a water shortage plan.
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