Водопонижение и водоотлив как способ предварительного осушения территории парка академика Сахарова г. Санкт-Петербурга

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The purpose of our work is to determine the causes of overwetting of the territory, to design a temporary pre-drainage system that ensures the effective removal of excess water during the construction of a permanent drainage system in the conditions of the Academician Sakharov Park. The main causes for excessive moisture withinthe object are: humid climate(precipitation exceeds evaporation by 2.8 times), shallow occurrence of the aquifer confi ning layer, high ground water position, which leads to the formation of headwater lenses during the year. According to climatic and hydrogeological studies, prior drainage should be carried out before starting work on the construction of a drainage system. The article considers in detail the design features of the water drawdown and dewatering, as well as the stages of construction. According to calculations on dewatering in the conditions of the Academician Sakharov Park with the capacity of the drained aquifer1.0…1.4 m, the average depth of the confining layer 2.0 …2.3 m and trench lengths from 110 …225 m, the time for drainage is 5…6 days, and the estimated infl ow of water to the mouth of the trench is within 3.29…3.85 m³ / day. To ensure effective work on dewatering from a trench with lengths of up to 225 m and with a drained aquifer capacity of up to 1.4 in the hydrogeological conditions of the territory of the Sakharov Park, it is recommended to use domestic pumping and power equipment of the «Vihr» type DN-400 with a flow rate of 11.5 m³ / h.