you could be taking water from a river with bacteria or oil and chemicals
salination of rivers
salination of rivers
Examples of irrigation system are,Perennial irrigation (Dams)Direct irrigation (river canal irrigation)Storage irrigation (tanks and resevoirs)
`Chain pump system of irrigation is a traditional method of irrigation.
need of irrigation: insufficient of rainfall uneven distribution of rainfall improvement of perennial crops. mode of irrigation: 1. Lift irrigation 2. flow irrigation
salination of rivers
i am not sure.
salination of rivers
irrigation
The Sumerians couldn't take the heat so they made a irrigation system. The built canals that connect to the river but the problem was that there crops would get ruined from the floods the irrigation system.
They build a kind of irrigation system
From wikipedia: "Irrigation" is an artificial application of water to the soil.The problem must be the Aral Sea shrinkage.The Aral Sea lost 90% of its volume within a few decades due to the intense irrigation of cotton and rice fields in Central Asia since 1960s.
They used a shaduf.
You have not stated any problem.
There is insufficient information for us to answer this question. Please edit the question to include more context or relevant information. It would be useful to know, for examples, what you consider to be a problem with irrigation by rivers - it seems to have worked quite effectively for several thousand years!
Li Bing's biggest problem while building the irrigation ditches was the massive amount of silt and debris carried by the Min River, which continuously filled up the ditches. He solved this by constructing a special dividing weir known as the "Fish Mouth" to help divert the silt-laden water away from the irrigation system.
they felt like the needed to help the other people