Bioretention pond

A pond body of the biological detention pond is composed of a front pond and a seepage storage pond, the front pond is arranged on the water inflow side, the depth of the front pond is smaller than that of the seepage storage pond, and the edge of the pond body is arranged along the terrain trend; the front pond is used for precipitating, intercepting and adsorbing incoming water, and the storage and infiltration pond is used for storing and infiltrating the water treated by the front pond; the front pond and the seepage storage pond are separated through a stone isolation belt, aquatic plants are planted in the front pond and the seepage storage pond, trees around the pond and hedgerow isolation bodies with thorns are planted on the edge of a pond body at intervals, and the trees around the pond are arranged between every two adjacent groups of hedgerow isolation bodies with thorns. Daily water drinking, reproduction and inhabitation of small animals in the mine ecological restoration area are facilitated, a