I’m sure this has been covered before, but as I was walking past an oval the other day with the sprinklers on, I stated to wonder, which can’t we use recycled water on the ovals rather than potable “town water”. This plan seems so simple that there must be some massive defect I haven’t thought of or it would have been done already.
Basically, we install subterranean water tanks close to each oval to be watered with a capacity of at least 20,000 litres. A pump is connected to the tank which pressurises the water and drives the existing sprinklers. The electricity supply wouldn’t be a big problem as most of the ovals have lighting for night time use, so power is available nearby.
Filling the tanks from rain water wouldn’t be practical, but I don’t see any reason why you couldn’t fill a tanker tuck with 20,000L of water from the Sewerage treatment works output. If the water is good enough to put in the river (in which people swim, i.e., primary contact activities) then surly it is good enough to water some grass. If people are really worried about microbes etc, then stick a bit of chlorine in the water before using it.
Tanks and pumps don’t cost a lot of money to purchase and install (considerably less than replacing the grass with a synthetic alternative), and shipping the water as required wouldn’t be all that dear either.