Hydraulic Efficiency of Urban Drainage Network

The paper presents a methodology for analyzing and computing the efficiency of urban drainage networks through the use of performance indicators. The methodology is based on system approach and describes the hydraulic behavior of each element in the network as well as the whole system. A global performance methodology has been used to define different performance indicators based on system parameters. Due to the dynamic behavior of the drainage networks, proper consideration of system operations (management policy, operating conditions) are essential for better understanding the system functioning. In order to help the decision processes, spatial and temporal distributions of the performance indicators are evaluated to express the responses of each element in the network and, to state how it affects the functioning of those that surround. All the performance indicators are assessed quantitatively and could be combined or compared to assess the overall system performance