This type irrigation involces application of water by gravity flow to the surface of the field. No pump or any other device is used to force water towards the fields.
In this type of irrigation, water is pumped through a pipe system and then sprayed onto the crops through rotating sprinkler heads. This type of irrigation is not suitable for delicate crops such as lettuce.
In this type of irrigation, water is conveyed under pressure through a pipe system to the fields, where it drips slowly onto the soil through emitters or drippers which are located close to the plants. Suitable for all row crops but only high value crops are irrigated this way because of cost involved.