Water storage structure Water storage structure Mcgille (Structural) (OP) 10 Nov 11 18:29 Hi,Need to design a water reservoir about 100 ft long.Do we need to provide movement joints? What are the factors to be considered.Any help appreciated.thanks. RE: Water storage structure JAE (Structural) 14 Nov 11 10:42 At 100 feet probably not needed to have expansion joints - design per ACI 350 and not ACI 318. RE: Water storage structure TXStructural (Structural) 15 Nov 11 15:19 What JAE said. Notably, you will likely end up with a higher minimum reinforcement ratio, since serviceability (crack width and distribution) controls most design.Is this a freestanding tank or earth impounded reservoir? RE: Water storage structure Mcgille (Structural) (OP) 16 Nov 11 15:03 It is an earth impounded reservoir.From ACI 350,I see higher min. reiforcement ratios as you mentioned. What will you recommend about construction and control joints requirements and spacings?