Basic Principles of the Czech Technical Standard on Sustainable Stormwater Management

The paper introduces basic principles of a new Czech technical standard in the field of stormwater management (TNV 75 9011 Sustainable Stormwater Management). It describes the procedure of the selection of the drainage concept, when individual approaches (stormwater infiltration, drainage to the surface waters, drainage by the combined sewer system) have to be subsequently examined as to their admissibility and feasibility. Within the detailed drainage design, focus is put on the hydraulic loading of infiltration devices determining their pollutants removal efficiency and on the stormwater pre-treatment techniques suitable for the removal of individual pollutant categories before infiltration or discharge to the surface waters. The standard gives also an overview of stormwater management structures and devices together with the rules for their technical and hydraulic design, construction, operation and maintenance.