Geography
Give a geographical reason for each of the following:
(i) Well irrigation is confined mainly to the alluvial plains.
(ii) In Tamil Nadu, nearly one-third of the net irrigated area is under canal irrigation.
(iii) Drip irrigation reduces loss of water through evaporation.
Answer
(i) Well irrigation is confined mainly to the alluvial plains as owing to the soft nature of the soil, wells can be easily dug and the yield of crops from the land after irrigation is considerably high.
(ii) In Tamil Nadu, nearly one-third of the net irrigated area is under canal irrigation because Tamil Nadu receives rainfall during the winter season while summer season remains dry. Thus, irrigation is needed in summer to make up the lack of rainfall.
(iii) Drip irrigation reduces loss of water through evaporation as this system consists of perforated pipes that are placed between rows of crops or buried along their root lines and give water directly on to the crops.
Related Questions
State any two drawbacks of conventional methods of irrigation.
Give two advantages and two disadvantages of well irrigation.
(i) Name any two states where well irrigation is practised.
(ii) Give one advantage and one disadvantage of tubewell irrigation.
Name the two types of canals. Name two states where perennial canals are widely used.