For its entire length, the Dnepr-Donbass canal traverses the bottom lands and primary and secondary terraces =nY*,Xu<
of the Orel', Orel'kya, Britai, and Bereka Rivers. Ground water is encountered at a level of from 0.5 to 2-3 -bs~{
m below the surface. Ground water appears here and there on the exposed surface at points in depressed areas, ].Et&v
forming stagnant sections. All basic hydraulic structures on the canal are below ground-water level and require =UYc~VUYnT
dewatering of the foundation pits. Rq\.RR](
Using methods of deep dewatering, the ground-water level has been lowered by 8-9 m in the foundation pits yt<K!=7&
for the siphons, and by 10.5-17 m in the pumping station pits. The foundation pits for the structures located in ~e 4{J%`H`Q!
bottom lands are surrounded by a cofferdam I0 m wide to protect against flood waters. Here, the seasonal fluctuations )9PQj
in the ground-water level reach 2-8 m. The pumping station pits were excavated by dry land machines; \
(X~Z
while siphon pits were opened by the method of hydromechanization to a depth of 6 m with shaping to the design V=
.'Db2D
elevation by dry-land machines.