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Figure 3.2 - Surface Water vs. Groundwater Total Water Use = 1,800 ac-ft I iii Surface System Limitations As part of providing an overall perspective, it is appropriate to also provide insight into potential system limitations. Accordingly, major limitations of the water supply components have been provided. Limitations with CBr Water Current CBT supplies are sufficient to meet Firestone's water demands. To date, there have not been any potable supply shortages. However, it should be noted that the CBT system was originally designed as a supplemental supply to native water rights. Each year, the amount of water delivered by the CBT system (i.e. quota) was set based on demand. For example, in a dry year when water demands are highest, the quota would be set higher (i.e. 1000/0). Conversely, in a wet year, when native supplies are plentiful, the quota would be set lower (i.e. 500/0). The years 2002 and 2003 were an exception when, for the first time in the system's history, the quota was set based on the limited supply in the CBT system. To maintain this delicate balance, and to prevent speculative water purchases, NCWCD has set limits on the amount of CBT water each entity can own in relation to its water demand. Since Firestone owns sufficient CBT to meet its demand, it has exceeded its CBT ownership as compared to the demand associated with its committed taps per NCWCD regulations. Because of this fact, the Town is "capped" and cannot purchase additional CBT supplies through the open market. Accordingly, the Town must rely on additional CBT acquisition through dedication from developers annexing into the Town. This NCWCD requirement puts a burden on the Town to figure out other sources of domestic supply since it cannot purchase additional CBT water. Clear Water Solutions, Inc. Town of Firestone 2007 Water Conservation Plan 8