Apologists of Israel expect that there should be something equivalent of Hoover dam on the borders of Gaza and as there isn't, they go on claim that the Palestinian claims are just propaganda.

But there are small dams and two major reservoirs, one seasonal, just on the borders of northern Gaza. Normally these are used to stop water from getting to the Gaza side.

The even occasionally lush vegetation on the ethnically cleansed side of the border is one of the symbols of oppression, not a "miracle" of "making the desert bloom" - just a result of denying water from Gaza.