Est imated Sustainable Discharge Rate,
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Based on the Rate the Level of Mountain Lake Drops
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We thank the employees at Moran State Park
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for providing this data as part of the Mountain Lake
Management and Operations Agreement.
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Lake
levels reported here are in in inches above the spillway. Area of
Mountain Lake: 198 acres
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Discharge Rate
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Date
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Level (inches)
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Drop in feet
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Acre ft
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Duration(days
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Acre ft/yr
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08/19/93
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14.4
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12/03/93
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1.2
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1.1
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217.8
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106
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750
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05/06/94
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7.2
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07/11/94
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1.2
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0.5
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99
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66
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548
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Peak
1993 to peak 1994 net lake level loss
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Date
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Level (inches)
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07/31/93
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16.5
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(spillway
level with 3 stop logs in place)
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05/06/94
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7.2
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Net loss
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9.3
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Inches
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Net loss
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153
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Acre ft.
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The
discharge rate from Mountain in the fall of 1993 was approximately 748
acre ft/yr
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The
discharge rate from Mountain after the 93/94 rains was approximately
550 acre ft/yr
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The
net loss in storage from Mountain Lake was 238 acre ft.
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Without
depleting the storage during these non drought years,
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using
the average of the discharge rates going into and coming out of the
93/94 rainy season,
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the
sustainable discharge is estimated at 495 acre ft/year
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It
would be very interesting to correlate the levels with detailed
rainfall records Olga residents have provided to NOAA.
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Sandy Taylor 12/13/2005
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