Agenda - 10-18-1983 - Laserfiche WebLink

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___--__- O ORANGE COUNTY BOARD OF COMMISSIONERS ACTION AGENDA ACTION AGENDA ITEM ABSTRACT ITEM NV'44,-3 MEETING DATE 0r+nx"r LB` l9u SUBJECT: Lake Orange Management Plan ' IDE PARTMENT; - '` PUBLIC HEARING. YES X N 0_ ------ �� '--- ' ------ - ' --- C ss�oner Hillhnit INFORMATION CONTACT: nmm omm ATTACHMENT(S): -t,'-� -5`0 NRCD 0 r' ;e of Water PHONE NUMBERS: HILLSBOROUGH - 732-8181 HILLSBOROUGH - 732-9351 Resources Data CHAPEL HILL - 967-9251 MEBANE - 227'2031 DURHAM - 688-7331 _--_ PURPOSE: To review a proposal from the State Office of Water Resources for a management plan for Lake Orange. BACKGROUND: In times of severe drought, the quantity of water available in the upper Eno is insufficient t the d of the Orange-Alamance Water System, the Town of develop a plan fOr timing the release of water from Hillsborough, Lake Orange to meet these competing needs, the State Office of Water Resources (OWR) was requested to assist the County ln developing a management plan for Lake Orange, the major reservoir upstreamlfrom the Town of Hillsborough's Water Treatment Plant. Staff frlom OWR met with representatives of the above groups on October 3, 19f4, and presented a proposal that would balance the needs of the aquatic environ nt with the needs of the customer of the three water treatnent agencies. Their proposal contained several specific reconmendations. Specifically, they aske : 1) If the concepts (recommendations of in-stream flow and conservation) were reasonable. 2) For a response from Hillsborough and Orange-Alamance as to their wrilingness to enter into agreements with the County regarding imple- mentation of their proposal for managing releases from Lake Orange. 3) FOr an indication of the willingness of Hillsborough and Orange-Alamance tO decide on a long-term allocation formula for the release of water '|""' Lake Orange in the event of new, or limited, water resources. Further, Mr. John Wray, Deputy Director of OWR, indicated that more refined recommendations could be made if more accurate use-data for Hillsborough and Orangn+Uamunce could b e obtained, and an accurate stage-storage profile for Lake Orange was developed. IMPACT: The draft proposal 1s attached. Pertinent points are: l) Table 1 and underlying assumptions al Orange-Alamance withdrawal is closer to 0.5 MGD rather than- 1 0.38 MGD. bl Hillsborough withdrawal is greater than 1.1 MGD, thus the I daily transfer to OWASA ranges from 1.4 - 1.6 MGD rather ' than an average of 1.65 MGD. 2) - Lake Orange stage-storage curve is tentative and needs to verified. It was reported at the October 3 meeting that Lake Orange was down four feet. Referral to Figure 1 indicates that the Lake is already down to 64% of capacity. 3) The storage capacity of Cnrporhtihn Lake (72 Acre-feet) and Lake Ben ~ »nsnn (73 Acre-feet) are relatively insignificant when composed t u o capacity of Lake Orange (1394 Acre-feet). --- |