Precipitation Data Requirements for Urban Hydrology

ABSTRACT

Precipitation is the decisive input variable for a large number of dimensioning methods and models in urban hydrology. Due to the small catchment areas and the shorter flow paths, the runoff processes are characterized by a high degree of dynamics. This makes it necessary to lay down correspondingly strict requirements for representative time-and space-related precipitation data. The following defines these requirements in greater detail with regard to ‘sewer dimensioning’, ‘storm-water treatment’, and ‘sewer system management’. The methods used in Germany for supplying precipitation data are described, and reference is also made to alternatives that may be used in cases where the database is insufficient.