Whether it's natural or artificial, crops don't grow too well without it. In many parts of the world, irrigation is the key to sustained profitability. General Keep it on the farm Despite the importance of water on a farm, too much of it runs off and is lost. There are a variety of ways to minimize this loss. Principles and methodologies are outlined.
Drainage is the answer, but doing it right is paramount.
This site is an online accompaniment to an undergraduate course on the subject from the Department of Agricultural Engineering at the University of Illinois. Well worth browsing if waterlogging is a problem for you. Mix of both free and commercial. One of the most renowned research institutions in this field is the United States Salinity Laboratory in California. There's no shortage of ways to decide when to water a crop and how much to apply.