For its entire length, the Dnepr-Donbass canal traverses the bottom lands and primary and secondary terraces >t2E034_
of the Orel', Orel'kya, Britai, and Bereka Rivers. Ground water is encountered at a level of from 0.5 to 2-3 y74Ph:^k
m below the surface. Ground water appears here and there on the exposed surface at points in depressed areas, e%VJ:Dj
forming stagnant sections. All basic hydraulic structures on the canal are below ground-water level and require |*079v
dewatering of the foundation pits. ` aTkIo:ms
Using methods of deep dewatering, the ground-water level has been lowered by 8-9 m in the foundation pits ZM oV!lu
for the siphons, and by 10.5-17 m in the pumping station pits. The foundation pits for the structures located in ~e @=o1q=5@8
bottom lands are surrounded by a cofferdam I0 m wide to protect against flood waters. Here, the seasonal fluctuations wT?.Mte
in the ground-water level reach 2-8 m. The pumping station pits were excavated by dry land machines; FY%v \`@1*
while siphon pits were opened by the method of hydromechanization to a depth of 6 m with shaping to the design 8zew8I~s
elevation by dry-land machines.