Garden Irrigation: Daily Water Consumption for 1200m2 Lawn - m3 Estimate Needed

Hello
1500m2 plot, of which 300m2 will probably be occupied by a house with driveways, terrace, etc. The rest is probably a lawn and is about. Can anyone estimate how much water will be needed for the irrigation system per day?

Regards

What irrigation? Dotted line buried or sprinklers?

For now, there is nothing, I am at the stage of building and making a well, I would like to estimate the capacity of the well more or less (what water supply - water slowly flows in - what depth of the vertebral well to dig) and whether to make a larger reservoir or rely on a water supply, etc. - I would like to do some preliminary financial calculations.

That is about 1000 m2. It is economical with 1m3 per day, and 5m3 is good. It depends on the ground and grass. Water Tuje in droplets and the lawn with sprinklers.

To water the lawn well, you need to pour approx. 5l / m2 (-5mm rainfall) - this is 5m3.
This year there was a drought and, unfortunately, economical irrigation (about 2 l / m) did not bring any results - the lawn was drying up. I think the minimum is 3-4l / m2 every other day, every day in hot weather.

I have something of a herbaceous nature and I don't water well. The neighbor has a beautiful lawn and I believe he watered more than 5 liters per square meter, but he cares a lot about the lawn. We have poor soil, well-drained. I will be making a lawn in a few years and I am thinking of replacing the top layer and mixing it with clay or some modern water-absorbing granules.
For me, the limitation in watering lawns is the cost of water. The communist "ruler of the city" did not give permission to build a deep well and we pay 3 times more for water than from our own well.