Irrigation is primarily used to increase the soil moisture content in order to meet the water requirements of crops and support plant growth.

Flood irrigation is a traditional method widely used for large-scale farming due to its simplicity and low cost. It involves flooding the field with water to saturate the soil.

The primary purpose of drainage in agriculture is to remove excess water from the soil to create a favorable environment for plant growth and prevent waterlogging.

Subsurface drainage involves installing perforated pipes below the soil surface to collect and remove excess water from the root zone.

A weir is a structure built across a river or channel to control the water level and regulate the flow of water for irrigation purposes.

Drip irrigation is recognized for its high water-use efficiency as it delivers water directly to the root zone of plants, minimizing evaporation and reducing water loss.

Insufficient drainage is the main cause of waterlogging in agricultural fields. When the drainage system is inadequate, excess water accumulates in the soil, leading to waterlogging.

Contour irrigation is specifically designed for sloping fields. It involves creating furrows or ridges along the contours of the land to distribute water evenly and prevent soil erosion.

A canal is a constructed waterway used to convey water from a source, such as a river or reservoir, to agricultural fields for irrigation purposes.

Surface drainage involves the construction of channels or ditches on the soil surface to collect and remove excess water from the field.

Soil type is a crucial factor to consider when selecting an irrigation method. Different soil types have varying water-holding capacities and infiltration rates, which influence the choice of irrigation system.

Terracing is primarily used to control soil erosion on sloping land. It involves constructing level terraces or ridges along the contour lines to reduce the velocity of runoff water and prevent soil loss.

Drip irrigation is widely used in arid and semi-arid regions due to its ability to deliver water directly to the root zone of plants, minimizing evaporation and maximizing water-use efficiency.

A sluice gate is a movable gate used to control the flow of water in an irrigation system. It allows for the regulation of water distribution and the maintenance of desired water levels.