Delay Ponds as a Solution for Sustainable Urban Development and Management

Assessment of flood phenomena and street floods in runoff transmission network basins shows that in some cases rainwater transmission channels cannot transmit current flow after a while - especially during peak flow- due to an increase in impervious surfaces, particularly owing to some changes in physiographic characters of the basin.. To solve such problems, many research efforts have been undertaken and practical procedures have been implemented. Delay ponds are one of the methods to solve these problems. Other optimal management strategies, BPMs, which can be used depending on the technical and economic conditions in order to solve such problems are biological remain systems, porous coating of streets, vegetative swale, etc. In this paper, a review of literatures is presented and then our research procedure is presented. Then some issues such as drainage network modeling process in the SWMM software environment are presented. The modeling procedure has been done in Status quo coupled with using delay ponds, in order to find the routes in the network and compare both waterways hydrograph (with and without delay ponds), hydrograph of the individual components in existing networks as well as using the network with delay ponds. It was observed that using delay ponds could be effective especially in limited urban areas. And it can reduce the peak hydrograph flow, increase the peak flood time and as a result, control and optimize management of flood. For this purpose during a two-stage modeling, two and three places were positioned for the construction of flood control basins. It is shown that in case of using two and three basins, the peak discharge were is reduced by 31% and 38%, respectively.