Krasnodar GRES Project Volume I11 Environmental Assessment

Table 4.20 summarizes basic information on the duration of icing phenomena in
the Laba river
Table 4.20
Duration of Icing Phenomena in the Laba River Near Kaladzhievskaya
Characteristic
Average
Early (highest)
Late (lowest)
Occasionally, hanging dams are observed in the Laba river, but they are less
frequent than ice jams. A rise in the level may last more than 1 to 2 days, and
sometimes only a few hours, but sometimes ice jams can occur continuously for
up to 10 days.
4.2.1.6 Discharge
Beginning of
Ice
Phenomena
15.12
12.11.56
9.02.38
Dates
End of Ice
Phenomena
8 -03
20.01.62
6.04.65
Number of Days
With Ice
Phenomena
41
97- 1 93 1 132
6-1 965166
With Freeze-
UP
1
64- 1 953154
0-91 %
The flow of the Laba river is formed by melting ice, snow melt, glacial thaw,
rainfall and groundwater.
The high water flow accounts for 75-80% of the annual flow. The low water
period lasts almost as long as the high water period, but its flow accounts for 20-
25% of the annual flow.
The characteristics of the Laba river annual flow at the proposed water intake is
compiled from data published in the cadastral literature (Surface water resources
in the USSR, hydrological yearbooks, etc.)
The Laba river cross section near Kaladzhinskaya is accepted as a reference
section, characterizing the Laba river flow at the Krasnodar GRES site.
Table 4.21 summarizes the average discharge of various probability.
PAGE 4-25