Guidelines for hydrodynamic calculations on urban drainage in the Netherlands: backgrounds and examples

In The Netherlands guidelines are presented describing a system for the input and performance of hydrodynamic calculations on urban drainage. These guidelines are a framework of starting-points and conditions in which the calculations are made. In addition default values for some of the calculation parameters are defined. In this article some backgrounds are presented on the rainfall: standard events, time series and a runoff model. A brief analysis and check of calculation results are given on a so called ‘didactic’ sewer system.