What type of irrigation system is based merely on gravitation?

Here are some types of irrigation: Subsurface irrigation: Delivers water directly to the root zone, which reduces water loss from evaporation and runoff. This method is good for landscapes where surface water could be harmful, such as around building foundations. Lateral move irrigation: Uses pipes with wheels and sprinklers that rotate to distribute water across a field. Furrow irrigation: Involves digging trenches between crop rows and filling them with water. The water seeps into the soil, and crops are grown on the ridges between the channels. Micro irrigation: Also called localized... Show more

Here are some types of irrigation:

Subsurface irrigation: Delivers water directly to the root zone, which reduces water loss from evaporation and runoff. This method is good for landscapes where surface water could be harmful, such as around building foundations.
Lateral move irrigation: Uses pipes with wheels and sprinklers that rotate to distribute water across a field.
Furrow irrigation: Involves digging trenches between crop rows and filling them with water. The water seeps into the soil, and crops are grown on the ridges between the channels.
Micro irrigation: Also called localized irrigation, low volume irrigation, or trickle irrigation. This method uses low pressure and low flow rates to deliver water directly to the root zone of plants. 

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