The bases and literature review for conceptual planning and realization of technical solutions related with wet-weather discharges are presented in this paper. Special attention applies for combined sewer overflows. The future technical measures are based on redefined water protection requirements , which can be achieved, at optimal costs, usually only with a combination of different technical measures. A substantially large spectrum of technical possibilities, with costs and efficiency evaluation, are presented in this paper. This document contributes as a help for the choice of technical solutions in the future.