Now that the raining has started i do not believe this should be a problem. You need to be mindful that when the owner is here they need water to shower, and your staff use all of the water on gardening so this is why Khun Aoui said this. You need to try and water the grass at the colder part often day and not in the afternoon when it is very hot as this will loss half the water before it even gets to the grass.
On another note, when will you replace the tree at the entrance?