well first of all if there is too much irrigation the river would get dirty and animals would die
Absolutely. Without irrigation, they would be able to produce very little.
The Los Angeles basin was quite arid prior to the introduction of irrigation. Without irrigation, Las Vegas Nevada will wither. Without irrigation, the garden would wither and die.
Arizona =p
Irrigation is the process of supplying water artificially to the plants through land or soil. Some of the commonly used irrigation types are surface irrigation, localized irrigation, sprinkler irrigation, sub irrigation, automatic irrigation and in-ground irrigation.
Without water irrigation, the desert areas would be too arid, and food plants would be unable to grow as a farm crop.
It would be just like it is, the same things would happen with or without seismologists. (just as it would with or without any other humans)
Crops in the desert will not grow without irrigation. The wound needs irrigation to clean the dirt out and prevent infection.
Without the Internet, The World would tremble. Political Uprise would happen and many other things can happen.
of course Babylonia had a irrigation system, without water how would the plants in hanging gardens be able to survive, after all water is one of the building blocks to a Civilization.
there would be no wind!
you would not be able to hear