Abstract
Abstract: The study area of Ladnun block is situated in the northern part of the Nagaur district of Rajasthan State, India covering about 1448.83 sq. kms (excluding 81.25 sq. kms Non potential area) having coordinates 27°39’ to 27°65’ North latitude and 74°23’ to 74°38’ East longitude. Older alluvium, Jodhpur Sandstone, Bilara Limestone and Schist are principal sources of groundwater in the study area. Six Potential Zones have been demarcated in different aquifers. Yield of wells and tube wells varies from 90 to 350 M3 /day. Quality of groundwater is potable having EC value less than 4000 micro siemens/cm at 25̊ C. Depth of groundwater varies from 4.1 to 108 meters in the block. Groundwater quality varies widely in the Ladnun block. High concentration of fluoride and TDS are major quality problems associated with groundwater in the region (Vyas, 1999). Fluoride concentration of groundwater samples from 34 villages of Ladnun block was monitored and thirty villages were found to have a fluoride concentration above 1.5 mg/l. The maximum fluoride concentration (16.1 mg/l) was recorded in groundwater of the Kasumbi village, while minimum (0.90 mg/l) was recorded in Hudas village. The study area is recommended for groundwater management and conservation.
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