In my opinion you should ...

In my opinion you should first look to the water demands ( needs ) in the area for a certain period of time . If this demands shows up every other year or not . In relation to this you will be able to calculate if your projects can fullfill the needs and make an economical cost efficiency calculation .

So define the area you are focussing on to deliver water solutions .

Define the volumes you need for a certain periode to overcome the periode without natural rainfall .

Do not forget to look also into the soil deficits .  The soil is a reservoir of water and nutriënts .

In relation to the plants growing , the readely available water , you can define the real needs .

You have to use the soil water reservoir and work on daily deficits . Using evepotransipiration , soil specifications , plant specifications , climat .

Good luck

Paul Van Breda

Certified Irrigation Auditor , Certified Irrigation Designer