From then on, it started the procedure of piping river water from further inland to get infiltrated through the dune slacks. The river water sinks through the sand, filters alone from unsafe pathogens, and replenishes the underground stocks with clean up water. Rokin – November 1977 The Amsterdam canal method https://riverksydh.wikigop.com/691438/new_step_by_step_map_for_water_slide_rental_katy_tx