Nice, nearly 1/2 acre I got less than half that. House is only 3 x 1, have a fair amount that is paved and in time will pull some of that up
Feel for you being dependant on rain, though you seem to have good crops.
When I first looked at doing a vege garden, looked at rain water tanks but then got a quote for a bore and at $3200 all hooked up including a controller I though it looked far better than rain water tanks. Water is crystal clear and tastes as good as bottled water but have to had it tested