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Eno River Water Management Plan Table 1 Revised March 2000
<br />Maximum Allowable Surface Water Withdrawals Based on Lake Orange Water Level
<br />Notes:
<br />t Allowable withdrawals for Hillsborough shown above do not include withdrawals of water supply releases from West Fork Eno Reservoir.
<br />* - Adjusted to reflect outside source agreement for Hillsborough and Orange- Alamance.
<br />- Excess withdrawals from Eno River based on outside source agreement may be made when flows at the Eno River at Hillsborough Gage are 10
<br />cubic feet per second (cfs) and above, regardless of water level in Lake Orange. Maximum withdrawals shall be limited to the total of the
<br />contract amount and the allocated amount.
<br />- A low flow period will begin on the 7" consecutive day of the ,average daily flow at the Hillsborough Gage dropping below 10 cfs. On the 4`'
<br />day, the Orange County Engineer will request that affected parties prepare for a low flow period.
<br />- 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
<br />the Stage 1 amount shown above (100 -80 percent of storage remaining), regardless of water level in Lake Orange.
<br />- When flows are below 3 cfs at the Hillsborough Gage during a low flow period, withdrawals shall be limited to amounts shown above for percent
<br />of storage remaining at Lake Orange.
<br />- 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
<br />days. The Orange County Engineer will notify affected parties when the low flow period is terminated.
<br />* *For Piedmont Minerals: When flows at the Hillsborough Gage are 14 cfs and above, withdrawals from the Eno River will be limited to 900,000
<br />gallons per day (gpd). Between 14 cfs and 4 cfs, withdrawals will be limited to 430,000 gpd, regardless of water level in Lake Orange. Below 4
<br />cfs, withdrawals will be limited to amounts shown above for percent of storage remaining.
<br />Allowable Surface Water Withdrawal
<br />Instream Flow Requirement at Hillsborough Gage
<br />Percent of
<br />Drawdown
<br />(gallons per day)
<br />(gallons per day)
<br />Storage
<br />Remaining
<br />in feet from
<br />From
<br />Total Flow at
<br />at Lake
<br />top of 1 -ft.
<br />Town of
<br />Orange-
<br />Piedmont
<br />From
<br />West Fork Eno
<br />Hillsborough
<br />Orange
<br />flashboard
<br />Hillsborought
<br />Alamance
<br />Minerals
<br />Lake Orange
<br />Reservoir
<br />Gage
<br />> 1 00
<br />spilling
<br />p g
<br />*t
<br />*
<br />**
<br />1,100,000
<br />650,000
<br />1,7507000
<br />Stage 1
<br />100-80
<br />0.0
<br />1,510XOt
<br />820,000
<br />4307000
<br />121001,000
<br />650,000
<br />1,750,000
<br />Stage 2
<br />80-60
<br />2.0
<br />1,360,0001
<br />740,000
<br />380,000
<br />6502000
<br />650,000
<br />1,300,000
<br />Stage 3
<br />60-50
<br />4.3
<br />1,280,0001
<br />700,000
<br />3605000
<br />4503000
<br />650,000
<br />1,100,000
<br />Stage 4
<br />50-40
<br />5.8
<br />1,280,000t
<br />700,000
<br />320,000
<br />4507000
<br />650,000
<br />1,1001000
<br />Stage 5
<br />40-30
<br />7.4
<br />1,130,000t
<br />620,000
<br />190,000
<br />0
<br />6501000
<br />6505000
<br />Stage 6
<br /><= 30
<br />9.3
<br />68030001
<br />370,000
<br />0
<br />0
<br />6502000
<br />650,000
<br />Notes:
<br />t Allowable withdrawals for Hillsborough shown above do not include withdrawals of water supply releases from West Fork Eno Reservoir.
<br />* - Adjusted to reflect outside source agreement for Hillsborough and Orange- Alamance.
<br />- Excess withdrawals from Eno River based on outside source agreement may be made when flows at the Eno River at Hillsborough Gage are 10
<br />cubic feet per second (cfs) and above, regardless of water level in Lake Orange. Maximum withdrawals shall be limited to the total of the
<br />contract amount and the allocated amount.
<br />- A low flow period will begin on the 7" consecutive day of the ,average daily flow at the Hillsborough Gage dropping below 10 cfs. On the 4`'
<br />day, the Orange County Engineer will request that affected parties prepare for a low flow period.
<br />- 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
<br />the Stage 1 amount shown above (100 -80 percent of storage remaining), regardless of water level in Lake Orange.
<br />- When flows are below 3 cfs at the Hillsborough Gage during a low flow period, withdrawals shall be limited to amounts shown above for percent
<br />of storage remaining at Lake Orange.
<br />- 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
<br />days. The Orange County Engineer will notify affected parties when the low flow period is terminated.
<br />* *For Piedmont Minerals: When flows at the Hillsborough Gage are 14 cfs and above, withdrawals from the Eno River will be limited to 900,000
<br />gallons per day (gpd). Between 14 cfs and 4 cfs, withdrawals will be limited to 430,000 gpd, regardless of water level in Lake Orange. Below 4
<br />cfs, withdrawals will be limited to amounts shown above for percent of storage remaining.
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