Sedimentary soil shall be cleared when reaching 50% of the capacity. Sedimentation tank shall be cleaned or sand therein shall be replaced in case of drainage difficulty.

当沉积土达容量的50％时，清理沉积泥土；当沉淀池排水不畅时，清理或替换砂砾；

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It also damages the layers of sand and clay that make up aquifers, thereby reducing their capacity to be replenished.

这种做法也对组成含水层的沙土造成损害，使它的储水量减少。

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Processing capacity will decrease with imported sand temperature increase.

处理量随着进口砂温的增高而降低。

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Restoring the water-retaining capacity of hydro-electric dams by regular dredging and sand and silt removal is the only way left before the authorities.

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