If the sprinklers aren't used, the sides of the park become very slow for the movement of the ball when it's not raining. It's a huge difference between the surface being damp and the under lying rootzone being saturated.
Before a game, the hardness levels, moisture content are all recorded and adjustments are made to ensure the levels the management require are reached. You'll be surprised the amount of work that's involved for one game.
The club need to make a decision on the stadium expansion before anything will be done that will improve it to the lvel we require.
Leeds for the record spent 300k to relay the pitch last month. Insane amount of money for what is only a temporary fix and even at that, It was a huge risk.
The turf cost them a premium as it was being held for another club down south.