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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10 Revised July 1990 Table 1 Maximum Allowable Surface Water Withdrawals ------------------------------------------- Based_on_Lake-Orange-Level Drawdown Allowable Surface Water Withdrawal Percent of in feet --------gallons per day----------- Storage from top Remaining at of 1-ft . Town of Orange- Piedmont Instream Flow Lake-Orange-__-flashboard-_Hillsborough--Alamance--MineralsRequirement > 100 spilling * * ** 1 , 100, 000 100 - 80 0 . 0 1 , 510,000 820, 000 430, 000 1 , 100, 000 80 - 60 2 . 0 1 , 360, 000 740, 000 380, 000 650, 000 60 - 50 4 . 3 1 , 280 , 000 700, 000 360, 000 450, 000 50 - 40 5 . 8 1 , 280, 000 700, 000 320, 000 450, 000 40 - 30 7 . 4 1 , 130,000 620, 000 190, 000 0 < = 30 9 . 3 680, 000 370, 000 0 0 ------------------------------------------------------------------------ notes: *- Adjusted to reflect outside source agreement for Hillsborough and Orange-Alamance. - Excess withdrawals from Eno River based on outside source agreement may be made when flows at the Eno River at Hillsborough Gage are 10 cubic feet per second (cfs) and above, regardless of water level in Lake Orange. Maximum withdrawals will be limited to the total of the contract amount and the allocated amount. - A low flow period will begin on the 7th consecutive day of the average daily flow at the Hillsborough Gage dropping below 10 cfs. On the 4th day, the Orange County Engineer will request that affected parties prepare for a low flow period. - When flows are between 10 cfs and 3 cfs at the Hillsborough Gage during a low flow period, withdrawals from the Eno River shall be limited to the 100-80 percent of storage remaining amount shown above, regardless of water level in Lake Orange. - When flows are below 3 cfs at the Hillsborough Gage, during a low flow period, withdrawals will be limited to amounts shown above for percent of storage remaining at Lake Orange. - A low flow period will be terminated when average daily flow at the Hillsborough Gage registers 10 cfs or greater for a period of 7 consecutive days. The Orange County Engineer will notify affected parties when the low flow period is terminated. **- For Piedmont Minerals Inc: When flows at the Hillsborough gage are 14 cfs and above, withdrawals from the Eno River will be limited to 9001,000 gallons per day (gpd) . Between 14 cfs and and 4 cfs, withdrawals will be limited to 430,000 gpd, regardless of water level in Lake Orange. Below 4 cfs, withdrawals will be limited to amounts shown above for percent of storage remaining.