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Vertical drainage

Vertical drainage is the system of boreholes for lands drainage, from which water is pumped out by pumps with submerged electric motors. Depending on the location of wells over a drained area, they distinguish systematic drainage (wells are equally spaced over the area) and linear drainage. The latter is applied for capture of groundwater flows. The water pumped out of the wells is diverted by open canals or pipelines to main canals and outfall drains.

The structure of vertical drainage wells depends on ground types and hydrotechnical conditions: well screens are installed within the range of water-bearing stratum (aquifer bed); their length is to be at least 10 m. Screens with gravel-sand package are the most efficient.

Well depth is up to 2050 m. Screen diameter is 3040 cm; package thickness is 10 cm and more. The more the screen diameter, the more the water inflow to the wells.

In addition to the wells, pumps, and electric motors, the structure of vertical drainage consists of a transformer substation, power transmission line, start-up instrumentation, and automation devices. Operation of vertical drainage can easily be automated. When groundwater level rises, the pumps are turned on; when it drops to drainage rates, the pumps are turned off. The water pumped accumulates in basins; during arid periods, it is used for water application.

Cost-effectiveness of vertical drainage depends generally on the structure of wells, their depths, pattern of use of water pumped and land.

Selected bibliography

Monographs and brochures

Capacity building for implementation of the drainage strategy in the Aral Sea basin [in Russian] (2003) 

Drainage in the Aral Sea basin towards the sustainable development strategy [in Russian] (2004) 

Reshetkina, N.M., Yakubov, Kh.I. Vertical drainage [in Russian] (1978) 

Shestakov, V.M. Theory of backwater, water drawdown, and drainage assessment [in Russian] (1965) 

Eggelsman, R. Drainage manual [in Russian] (1984) 

Papers

Dukhovny, V.A. Drainage and our program for land reclamation improvement [in Russian] (2003) 

Drainage system development, efficiency and evaluation of their technical condition and ways to enhance the operational reliability at the current stage [in Russian] (2003) 

Magay, S.D. Operation of rehabilitated vertical drainage wells on irrigated lands of Southern Kazakhstan [in Russian] (2010) 

Magay, S.D., Vyshpolskiy, F.F. Drainage and water use in Southern Kazakhstan [in Russian] (2010) 

Magay, S.D., Balgabaev, N.N. Groundwater level dynamics and vertical drainage operating conditions on rice fields [in Russian] (2013) 

Yakubov, Kh.I. Land reclamation regimes and optimization of their parameters allowing for natural and economic conditions. Role of optimum reclamation regimes in the improvement of land and water productivity [in Russian] (2003) 

Regulatory and procedural guidelines and reference information

Manual for calculation of the structural elements of vertical drainage well. SANIIRI [in Russian] (1985) 

Land reclamation machines and equipment [in Russian] (1985) 

Guidelines for restoring the vertical drainage well production rate mechanically [in Russian] (1988)