The Leningrad oil shale deposit (b. Gdovskoye) is characterized by increased watercutting, which is associated with its karst formation. The average water content of four operating mines is currently about 7 m3 per 1 m of production, and in the pre-war years it reached 59 m³/t and more. Sustained average annual inflows to individual mines RASge from 520 to 1060 m³/h and total inflows from 2500 to 3300 m³/h. Over the last 15 years, 384 million m³ of water has been pumped and the average inflow to the mines has been about 3000 m3/h. There is no tendency to decrease the total water inflow.