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Baswa-Bandiqui, Dausa District, Rajasthan
 
Introduction
The Bandikui watershed in Dausa District, Rajasthan, is characteristic of a moderately thick alluvium overlying hard rocks.
The key groundwater management issues are the following:
The area suffers from over exploitation, with a water decline of more than 4 meters from 1998 to 2008. The stage of groundwater development is 173%.
The area suffers from fluoride contamination and salinity at places.
 
Agriculture is the predominant occupation in the area. The main source of irrigation is ground water wells. The shallow aquifers in the alluvium have mostly dried up. Therefore, delineation of deeper alluvial aquifers and fractured zones aquifers in the underlying hard rocks is essential.
The methodology developed for mapping aquifers in the area can be replicated in alluvial covered hard rock areas of Andhra Pradesh, Bihar, Karnataka, Maharashtra, Orissa, Rajasthan, Tamil Nadu, Uttar Pradesh, and West Bengal.
 
AQUIFER MAPPING PROJECT IN DAUSA DISTRICT, RAJASTHAN
  Assessment Unit Watershed  
  Name / Code Bandikui  
  Area 598 sq.km / 59800 ha  
  District Dausa  
  Taluk / Block Baswa  
  No. of Towns / Villages 200 villages for Baswa block  
  Approx. population in the Taluks Rural : 2.7 lakh (Baswa block)
Urban : 0.16 lakh (Baswa block)
 
 
Figure 4.1: Aerial view of study area.
 
  Normal Annual Rainfall 620 mm  
  River Basin Banganga basin  
  Major rivers / streams Sanwan Nadi and Palasan Nadi  
 
Figure 4.2: Location map of the area.
 
  Geology Quaternary Alluvium underlain by Schists, Phyllites, Quartzites, Granite Gneisses, and Migmatites belonging to Proterozoic and Archaean Supergroups.  
  Hydrogeology Groundwater occurs under unconfined to confined conditions in Quaternary Alluvium and in the underlying fractured zones in hard rocks.  
  Aquifers Sand layers in alluvium, weathered and fractured zones in hard rocks.  
Figure 4.3: Schematic view of aquifers disposition in Baswa-Bandikui area.
 
  Depth to water table (Min. / Max.)
(m below ground level)
Pre-monsoon 2011 : 31.4 m in Sikandara
Post-monsoon 2010 : 29.48 m in Sikandara
 
  Ground water level trend Annual : declining trend  
Figure 4.4: Hydrograph of water level variation in Bandikui.
 
  Stage of ground water development 173%  
  Groundwater quality The area suffers from fluoride contamination and salinity at places.  
  Major issues
Over exploitation
Fluoride contamination and salinity at places
 
  Methodology of study Hydrogeology and integration of multiple geophysical techniques.  
  Expected outcomes of aquifer mapping Map of alluvium aquifers and fractured zone aquifers and their potentiality and quality, aquifer-based management.  
  Geographical applicability of the methodology Alluvial covered hard rock areas of Andhra Pradesh, Bihar, Karnataka, Maharashtra, Orissa, Rajasthan, Tamil Nadu, Uttar Pradesh, and West Bengal.