Abstract
The earlier solutions of the problem of groundwater flow in an inundated rock massif with vertically drains (drain trenches) are represented by extremely complex mathematical relationships in complex variables which make them difficult to use in applied problems. A new approximate-hydromechanical solution of the problem was obtained with the use of velocity hodograph and the presentation of model relationships in elementary functions, which coincides with the exact data in boundary points and which are in almost complete agreement (⪡1%) with the results of exact calculations by V.V. Vedernikov for special cases. For the first time, a picture of the field of full flow velocities was analytically constructed in the form of an isotach family for the given inundated massif with drains, showing the heterogeneous character of velocity distribution in it at the presence of water in the drain. Groundwater flow diagrams are also presented for boundary lines (in particular, in comparison with the case when there is no water in the drain), along with plots of flow functions and heads.
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