Krasnodar GRES Project Volume I11 Environmental Assessment

3.2.7 Water Source
The source of operational process water and non-potable water during
construction for the project site is the Laba River, the largest tributary of the
Kuban River. Its water shed area consists of 12500 square kilometers in the
section of water intake by the project power plant is 3400 square kilometers. The
bottom of the water intake by the project power plant is pebbly and the river
mouth is sandy, The highest monthly water temperature in the Laba River near
the project site intake has measured from 3.8 to 18.2 deg. C. The lowest
monthly water temperature, for the same period, ranged from 0.0 to 15.7 deg. C,
The average annual water discharge in the Laba River in the Krasnodar power
plant intake section is 83.1 cubic meters per second.
A second source of process water is on-site wells. The project utilizes a dry
cooling system, so makeup water requirements are mainly for HRSG blowdown.
This means the water demand is relatively modest, about 120 m3/hr. It is believed
that the ground water and underground sources can easily supply the necessary
quantity. The use of well water would eliminate the environmental impact of
drawing water from the river. The use of on-site wells for process water makeup
is a viable alternative to utilization of the Laba River.
Water wells can be established in the water bearing gravel layer overlaying the
impervious clay layer. It is recommended that test wells be drilled at the project
site to establish the quantity and quality of the subsurface water. The information
obtained from the test wells will determine the appropriate cost for drilling of
production wells, pumping equipment and water treatment.
Drinking water for the plant upon operations will be supplied from a pipeline
extending approximately 33 kilometers in a northwesterly line from Andryuki to
the site, and no end of pipe treatment will be required. There are no known
ecologically sensitive areas along the proposed water pipeline route. Drinking
water during construction will be supplied from the existing Mostokskoya system,
and this system needs no improvements or expansion to meet the anticipated
demand. Fire fighting water will be supplied from a buried, on-site concrete tank
filled with water from the Laba River.
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