Agenda - 12-18-1985 - Laserfiche WebLink

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2 full. He explained that a 20-year return on a safe yield means that lif you get 2MGD, there is a statistical probability that one year out of 20 the river plus the stored water will not be sufficient volume to provide that yield. To establishl yield, the volume of the lake and the historical strength load levels are used to predict what the inflow of the lake will be, and by doing a mass balance determine if the water going out is more than that going in. If so, the difference mast come from storage. The problem is that with a limited amount of storage, the outflow can only exceed inflow by some amount which is the amount stored in the lake which has sufficient volume to offset. Mayor Sheffield pointed out that a problem exists with Corporation r,,ake in that it must overflow in order for water to get into Lake Ben Johnson. Ken Thpmpson reported that corrective measures are outlined which would give access to the increased volume of storage in Lake Ben Johnson. Chair Willhoit noted that if the modifications were made to the three; reservoirs, the safe yield could increase water availabilityjto 4MGD. Mayor Sheffield noted that the study was based on 1983 levels of consumption and that since that time projects have been either proposed or approved totaling 800,000 to 1,000,000 MGD and adding this to the 1.3MGD totals 2.3MGD. Chair Willhoit noted OWASA has a temporary impoundment at Cane Creek and it would be unreasonable for Hillsborough to put lime s on its own growth by selling water to OWASA. The Orange County Board of Commissioners was unanimous in not supporting such a move. He noted it would seem appropriate to continue selling water to OWASA as long as water is running over the dam at Lake Ben Johnson. Long term would be to allocate water from Jordan Lake for the northern part of Orange County. Once Cane Creek comes on line, it would be a potential water supply for Northern Orange County. Chair Willhoit pointed out that the County's responsi- bility in providing water resources needs to be defined. The County has taken the responsibility of identifying reservoir sites and instituting watershed protective measures for the reservoirs. 1 While the County can do the planning, the revenues to pay for the reservoir should come from those who benefit most. Commissioner Walker indicated he felt the County should cooperate with the Town and help provide for the extension ed with spending the clean 'sa re g • sewer. Heda. P of water and disagreed bond money for the expansion of the system but would agree to spend the money to increase water supply. Mayor Sheffield noted that the Town raised the water rates by 7% and the tap fee by $200 for water reservoir improvementsi to Lake Ben Johnson and not for system improvements: Horace Johnson noted that half of the 3500 water custo-' mere are in the County. Chair Willhoit pointed out that it would be inappropri- ate for the County to raise the tax rate to fund a reservoir and that several other approaches are available. The County ,