Types of Irrigation: Surface, sub-surface, drip, and sprinkler irrigation systems 

Here are the four primary types of irrigation systems:

1. Surface Irrigation

This is the most common and oldest method. Water is applied and distributed over the soil surface by gravity. It does not require pumps or high-tech equipment but can lead to water wastage if not managed.

• Sub-types:

  • Flooding: Water is let into the field without any specific control (e.g., for rice).

  • Furrow Irrigation: Water flows through small parallel channels (furrows) between crop rows.

  • Basin/Check Irrigation: The field is divided into small plots surrounded by levees.

2. Sub-Surface Irrigation

In this method, water is applied directly to the root zone of the plants below the soil surface. This is done through a network of buried pipes or by artificially raising the water table.

• Advantages: Reduces evaporation losses and keeps the soil surface dry, preventing weed growth.

• Challenges: High initial cost and risk of pipe clogging due to root penetration or silt.

3. Drip Irrigation (Trickle Irrigation)

Drip irrigation is the most water-efficient method. Water is delivered slowly and directly to the base of each plant through a network of valves, pipes, and emitters (drippers).

• Efficiency: Can reach up to 90% water use efficiency.

• Best for: Fruit trees, vegetables, and areas with acute water scarcity.

• Components: Mainline, sub-mains, filters, and drippers.

4. Sprinkler Irrigation

Water is sprayed into the air through nozzles and allowed to fall on the ground like natural rainfall. This system uses pumps to create high pressure.

• Best for: Uneven or hilly land where leveling is difficult. It is also suitable for sandy soils where water would seep away too quickly in surface irrigation.

• Advantages: Uniform water distribution and can be used for "fertigation" (applying fertilizers through the water).

• Disadvantages: High power requirement to run pumps and high evaporation in windy conditions.

Comparison Table for Quick Reference