Drip irrigation is more efficient at delivering water to plants – there is little to no loss of water to evaporation or runoff.
Drip irrigation is effective on uneven ground.
By minimizing contact with water to the stems, leaves, and fruit of plants, it helps prevent disease.
By keeping the rows between plants dry, it improves access to the plants and helps discourage weed growth.
Drip systems are inexpensive to install, easy to hide, and relatively easy to maintain. http://www.irrigationtutorials.com/drip-irrigation-design-guidelines-basics-of-measurements-parts-and-more/