Even though big Hindu temples are suggested at sangams (confluence of rivers), river banking companies, lakes and seashore, Brhat Samhita and Puranas suggest temples could also be developed in which a purely natural source of h2o is not really present. Below also, they recommend that a pond be created ideally https://hindu-temples-in-adelaide.mystrikingly.com/blog/hindu-temple-in-adelaide-a-sacred-place-for-worship-and-devotion