The aim of the project was to prepare a local precipitation model for the city of Gliwice, which will be used as the database for hydrological and hydrodynamic models of the city’s drainage systems composed of closed stormwater canals with a complementary system of open channels, which often function as receivers of stormwater runoffs.
Following the Client’s requirement, the precipitation model was prepared with real observation data from the period no shorter than five years. It was to be current precipitation data from the past few years with high time resolution adjusted to designing and modelling characteristics of urban drainage systems. Moreover, it was to be reliable data, obtained from appropriate meteorological services, recorded with rain gauges meeting the national measuring standards and installed in weather stations at specific weather condition.
Any precipitation model for a city should be based on long-term data collection i.e. 20-30 years of collecting data on local precipitation series. Unfortunately, the city of Gliwice has no such data. The Institute of Meteorology and Water Management has not systematically collected data on precipitation on the area of Gliwice in high time resolution. Due to restricted financial means of the Institute in this area, only daily precipitation has been recorded, which is insufficient for the purpose of this study.
Having this in mind, data on precipitation in high time resolution, taken in the two nearest weather stations in Katowice and Racibórz was used.