Treatment of pump drainage boundary in riverside city

Waterlogging is drained by pump stations set on the inner river network in riverside cities. More importance is given to avoiding waterlog through an applicable design capacity of pump stations, confirmed by a reasonable method to deal with the complicated boundary of the pump drainage. Node’s Water-level Control Method (NWCM) has been proposed in this paper. The core idea of NWCM was to transform the pump drainage boundary into the water level boundary, in accordance with the storage capacity curve and the characteristic of a less different water level in riverside cities. The design capacity of each pump station was obtained by unsteady flow calculation. In the case study, the design capacities of the eight pump stations of Hexi New Town in Nanjing City were confirmed conveniently by NWCM. The total design capacity was less than that obtained through regular methods due to the full consideration for storage capacity of inner river channels in the new method, which was designed in accordance with actual conditions.