Method of the calculation of vertical drainage with the syphone water intake of infiltration water

P.Khoruzhyi, V.Levytska

Keywords: vertical drainage, well, siphon drainage, water intake collector, , hydraulic supports, infiltration water

The efficiency of the operation of vertical airlift drainage systems of the left bank of the Kakhovsky reservoir, namely the area of the Kamyants’kyi Pid is analyzed. It has been established that airlift drainage systems are not effective due to the constant decrease in well discharge as a result of the colmatation of well filters by flocculates of trivalent iron hydroxide, which is formed as a result of the interaction of air pumped by compressor stations to the wells and local water, which contains colloidal iron bicarbonate as well as due to the low efficiency of airlift plants. It is proposed the measures to increase the efficiency of anti-filtering facilities operation by converting the airlift system for water intake from drainage wells to the siphon system.

The method of calculation of vertical drainage with siphon water disposal system in terms of non-pressure groundwater on the basis of hydraulic, hydrogeological and techno-economic calculations of the joint operation of all interacting structures of the anti-filter protection system is given. Based on the calculation of interacting drainage wells for determining the water flow from each well and reducing the static water level, an algorithm for calculating vertical drainage with a siphon system of water intake has been developed. The algorithm includes nine interconnected blocks and calculations by the formulas of the given method. It has been established that water flow from drainage wells under the siphon method of water intake depends on many factors: depth N, number of interacting wells n, distance between wells l, specific hydraulic resistance A, radius of water intake well r, vacuum head Hvac, filtration coefficient of aquifer layer Kf , radius of depression well pit R, well discharge and many other factors. The optimal parameters of the siphon water intake system are calculated by iterating according to the proposed method.

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