The project included the preparation of aquatic legal surveys and obtaining permits required under Water Law Act for 7 watersheds located on the area of the city of Wejcherowo. The survey aimed at legalising water devices and services i.e. draining rainwater and snow melt into the Rea and the Cedron rivers. The survey featured detailed calculations and current data obtained from available digital platforms (PANDa) that allowed to have a reliable and true precipitation data. Accurate calculations helped investors to make precise appreciation of costs connected with rendering water services.