Guided by the concept of Low Impact Development, urban rainwater garden is developed as a series of effective measures to regulate, manage and use rainwater. Based on the climatic conditions of Yiyang city, Hunan Province, the model of the rainwater garden is designed and applied in cities. The results show that after adding zeolite materials to the water purification layer, the removal rates of COD and ammonia nitrogen of the urban rainwater in the rainwater garden are 67.55% and 80.64% respectively, without the zeolite materials, the removal rates of COD and ammonia nitrogen in the urban rai...
