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From the 3 main sources of
water addition on the previous slide, the most basic is runoff. It has a constant coefficient of
0.622m/yr (POINT). This value
was determined by the Kennebec Regional Planning Commission based on slope,
local soil type, and land use.
Total volume of runoff is calculated by multiplying the runoff
coefficient and the land area of the direct watershed (POINT).
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Water could also be gained
through direct precipitation on the lake. 10 years of rainfall data at the Waterville treatment
plant were analyzed. Average
annual precipitation (POINT) over this period was multiplied by the lake
surface area (POINT).
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Water was lost through
evaporation. Its coefficient was
similarly derived as 0.56 m/yr from the KRPC (POINT). This coefficient was multiplied by
the surface area of Long Pond North (POINT) to yield the amount of water lost
annually to evaporation.
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