The Germany state of the art for designing stormwater discharges and combined sewer retention tanks is emission oriented. This approach does not adequately reflect the needs of urban brooks. Literature on the topic shows the need for further research investigations. Firstly, a detailed study is used to define the hydraulic impact of discharges and overflows on an urban stream. This paper attempts to relate the hydraulic impact in the form of shear stress with substrate movement. The correlation between the extent of stormwater impacts and ecomorphological properties is considered to be the significant parameter for evaluation of runoff. Finally a new approach for assessing stormwater discharges into urban brooks is presented. This approach is divided into hydraulic and pollutant components and takes the ecomorphological properties into consideration.

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