Agenda - 09-14-2021; 12-2 - Information Item – Memorandum Regarding Administrative Updates to the Eno River Voluntary Water Management Operations Plan (WMOP)

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11 June 1991 ADDENDUM To the Eno River Voluntary Water Use Agreement When Lake Orange is above 100 percent full and is spilling, Hillsborough will be allowed partial credit for water purchased from an outside source and discharged into the Eno River west of county road 1009 during the monitoring week that the discharge occurs, at a credit rate of 60 percent of the total discharge, when the discharge is made over a 24-hour period or greater. The credit volume will be divided by 7 days and added to the withdrawal limit listed in Table 1, to determine the allowed average daily withdrawal for that week. In the event that the flushing discharge straddles two monitoring weeks, the credit volume will be applied equally between the two weeks. The Orange County Engineer, or DWR staff in his absence, must be notified of the volume and the duration upon completion of the flushing. A written report of the flushing, detailing exact dates, times, and volumes, shall be included in the monthly report to DWR. If notification is not received with that months water use report, no credit will be granted and any excess water use will be labeled as a violation of this agreement . The Division of Water retains the right to revoke permission for Hillsborough to receive credit for flushed flows if at any time , in the opinion of the Division, the ability of Ben Johnston Dam to meet downstream flows may be compromised. Said revocation will be in effect until there is notice by DWR that the problem has been corrected to its satisfaction. If Lake Orange is not spilling, no credit will be allowed. - In the event that flow at the Eno River at Hillsborough streamflow gage is over 10 cfs, Corporation Lake and Lake Ben Johnston are both spilling water over the dams, purchases of water are being made from outside of the Eno River Basin, and the low flow period has not yet ended, users may cease their outside purchase of water and withdraw the amount of water allowed in the absence of a low flow period, as long as the ability to resume purchase of water for immediate customer delivery remains. This time period has been determined to be three days for the OWASA line. Water purchases will be made as often as necessary to flush the lines and keep them from stagnating. If flows drop below 10 cfs before the low flow period is over, Eno River withdrawals must immediately be reduced to Table 1 levels. - Transfer of water allocation between users is permissible under the following conditions: 1) Lake Orange is greater than 80 percent full; 2) notification of the duration and specific volume of the transfer will be given by the surrendering party to the Orange County Engineer, or the DWR in his absence, a minimum of one day before the transfer is to take place; 3) the total allocation will be adjusted if necessary by the averaging period of the surrendering party, and 4) written notification of the duration and volume of the transfer will be provided by both involved parties in their monthly water use reports to DWR. If prior notification is not received, DWR will not recognize the allocation transfer.