Many of today’s waterworks were built in the 1950s to 1970s and today they showsigns of damage and great wear on the concrete structures of the pools. There arelarge needs of renovation of the existing pools, but also an increasing need for newfacilities since cities are growing. This thesis aims to investigate the occurrence andcause of damages that can occur on concrete pools in waterworks and the demandson the tightness and durability of the structure. The target of the thesis is tofind out which factors are behind the requirements and how these can be taken inconsideration when designing new waterworks. The thesis has resulted in a guideline aimed at structural engineers, who lackexperience in designing waterproof structures, and intends to complement thedevelopment of design requirements. The use of the guideline is illustrated at the endthrough a simplified design example. The thesis has also shown that there are no general requirements for tightness anddurability for pool structures in waterworks, nevertheless there are many factors thatneeds to be considered, hence the requirements are project-specific.