Reprint - Central Arid Zone Research Institute

to erosional, depositional and erosional-depositional processes.Water erosion is the major problem and for its control severalsuitable soil and water conservation measures have been suggested.141 Singh, S., Pandey, S. and Ghose, B. (1966)Geomorphology of Siwana development block in Barmer district.Annals of Arid Zone. 5: 117-126Based on aerial photographs coupled with detailed field survey,Siwana development block had been divided into different landformsviz., rugged high and low hills, aggraded older alluvial plainsSiwana alluvial plain, sand dune and sandy plain, piedmont plain,Kundal-Ramania alluvial intermontance plain, recent flood plain,river bed with sand bars and saline depressions. The salientgeomorphic features of landforms like nature and depth ofsediments, slope and drainage patterns and associatedenvironmental hazards have been highlighted.142 Singh, S., Pandey, S. and Ghose, B. (1971)Geomorphology of the middle Luni basin of western Rajasthan,India. Annals of Arid Zone. 10: 1-13The geomorphology of the middle Luni basin of arid westernRajasthan has been discussed. The region consists of 11 geomorphicunits. The geomorphic features of the region are the products ofboth fluvial as well as aeolian actions. The condition of ground waterare favourable in piedmont plains, recent flood plains, eroded rockysurface, Siwana alluvial plain and Kundal-Ramania alluvial plain.The depths of wells in these units vary from 15 to 21 m. Thedrainage patterns developed in this region are linear, sub-parallel,sub-dendritic and radial. The largest concentration of streams is inpiedmont zone and the lowest number of the streams is found inPachpadra salt basin and undulating alluvial plains with sandyhummocks.The wind erosion is more conspicuous than water erosion. The watererosion is confined to the piedmont zones and gullies haveoccasionally formed. The wind erosion is more widespread in sanddunes, sandy plains and ploughed alluvial plains.To check the water and wind erosion several conservation measureshave been suggested.143 Singh, S. , Saxena, S.K. and Kolarkar, A.S. (1977)Integrated natural resources survey of Luni developmental block,western Rajasthan (India). The Indian Journal of Geography. 12: 1-12