For its entire length, the Dnepr-Donbass canal traverses the bottom lands and primary and secondary terraces 1EA} [x
of the Orel', Orel'kya, Britai, and Bereka Rivers. Ground water is encountered at a level of from 0.5 to 2-3 `Z~\& r=
m below the surface. Ground water appears here and there on the exposed surface at points in depressed areas, O.wk*m!9
forming stagnant sections. All basic hydraulic structures on the canal are below ground-water level and require Dq~D4 |
dewatering of the foundation pits. ;NrU|g/ksX
Using methods of deep dewatering, the ground-water level has been lowered by 8-9 m in the foundation pits 0D_{LBO6LU
for the siphons, and by 10.5-17 m in the pumping station pits. The foundation pits for the structures located in ~e |PW . CV0,
bottom lands are surrounded by a cofferdam I0 m wide to protect against flood waters. Here, the seasonal fluctuations #6qLu
in the ground-water level reach 2-8 m. The pumping station pits were excavated by dry land machines; NFlrr*=t>
while siphon pits were opened by the method of hydromechanization to a depth of 6 m with shaping to the design MNsgD3
elevation by dry-land machines.
