Low-cost water producing system for hydraulic and hydro-power engineering construction

A low-cost water producing system for hydraulic and hydro-power engineering construction comprises a water pumping device, wherein a water producing well is arranged at a fine material layer of a cofferdam and made of reinforced non-fine concrete material, and a non-fine concrete layer is poured at the bottom of the water-producing well. The water producing system takes full advantage of the filtration of an inverted filter of the cofferdam. After the filtration and sewage interception actions of the inverted filter of the cofferdam, the quality of the untreated raw water in rivers can basically achieve the water-quality standards of process water; and then through the sewage interception by the non-fine concrete, the water quality can be completely up to the standard. As the water point is close to the construction plant of a dam for shortening water supply pipelines, and an intermediate link of a water treatment plant is avoided, the costs of construction and operation are greatly reduced.