Krasnodar GRES Project Volume I11 Environmental Assessment

Deeper aquifers of the upper hydrogeological floor are disregarded here. The basic
groundwater direction of flow in all the aquifers is downstream along the Laba
river, that is to the north-west.
4.2.2.3 Thickness of Confining Beds
There are two uniform regional confining strata in this region:
Clays of the lower Sarmatian substage;
Clays of the Maikopian series.
A sketch of the hydrogeological section is displayed in Fig. 4.1.
Hydrogeological Section
Loam
Pebbles
Clays
Laba river
Fig. 4.1
Water-holding rock are represented by boulders and pebbles of various sizes, well
rounded. The content of silty-clay fractions is not in excess of 9.4%. The well-
washed nature of a filler (sand) for boulders and pebbles considerably increases
their collection properties. The aquifer is encountered at a depth of 3.0-5.0 m. Its
level is closely related to the period of the year. Clays and sands of the upper
Paleocene and lower Sarmatian serve as a confining bed for the aquifer. The
surface of the confining stratum is uniform with a slope in the northern direction
(along the valley), being equal to 0.004. The groundwater flow coincides with the
direction of river flow. The slope of groundwater surface is equal on the average
to 0.005.
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