perennial canals

• These canal bring water to the fields through out the year and are useful for both crops. These canals have been taken out in bar upland areas from the dams and barrages
• Q.1. What are perennial canals and how may they lead to problem of waterlogging and salinity in area S, photograph B.

  Ans. Canals that can supply water al year round from reservoirs / barrages, via link canals.

  Problems:

  Too much irrigation water leading to evaporation in hot, dry climate.

  Rise of water table.

  Rise of salts to surface.
• Advantages

  1. Supply of water round the year.
  2. Both crops are benefited.
  3. Provide water to the higher areas.