Performance of water quality and water quantity control and operational experiences of a multi-pond urban green space of Yichang Canal Park

Urban green space plays an increasingly important role in urban runoff management and ecological restoration. This paper monitored the multi-pond in the Yichang Canal Park that have been built for many years, and analyzed the performance of its water quality and water quantity control. It also combined field observation and interview to summarize the experience of park management operation. The main conclusions are as follows:1) The multi-pond achieved the effect of reducing and delaying flood peak through storage and release, while the multi-pond formed a multi-level regulating effect. 2) The multi-pond had a good performance on high-concentration pollutants in water bodies. When the concentration of pollutants was low, the removal effect wasn′t obvious. From the removal effect along the path, the removal efficiency of pollutants in the first half of the pond was high, but the removal efficiency in the second half was low or negative. In the stopped state, the amount of pollutants will increase after 24 hours of water accumulation in the pond. 3) The landscape had been enriched by the participation of many people and the continuous operation in many years, even though some design goals were simplified, lost, or changed.