REDUCTION OF RUNOFF BY MODIFIED TROUGH - INFILTRATION TRENCH SYSTEM - A CASE STUDY OF LESZNO TOWN

摘要

Stormwater management based on drainage technology using trough-infiltration-trench system is an alternative to the disposal of rainwater by traditional storm sewer systems. Troughs can be used for short-term storage of rainwater, which infiltrates through their bottom to the ground. Unfortunately in practice low soil permeability very often does not allow for sufficient intensity of infiltration. This situation can be solved by coupling the trough with a trench. Stored water is buffered by permeable trench material and released slowly by percolation to recharge groundwater and discharge, under control to the receiving waters. In spite of many advantages over the traditional stormwater systems, a traditional trough-infiltration-trench system cannot be applied in all topographic and construction conditions, which can form a barrier to implementation of the system. The purpose of the paper is to present a retrofit of a traditional trough-infiltration-trench system, which can be applied also in the conditions deemed earlier unacceptable.