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Impact of deficit rainfall coupled with high groundwater exploitation on water quality in semi-arid region of Karnataka

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Title Impact of deficit rainfall coupled with high groundwater exploitation on water quality in semi-arid region of Karnataka
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Creator Hrittick Biswas
A. Raizada,
Suresh Kumar,
M. Prabhavathi
P. Mohan Kumar
 
Subject Deficit rainfall, Groundwater quality, Semi-arid, Watershed
 
Description Not Available
A study was conducted in a semi-arid watershed spread over 442 ha located in
Chitradurga district, Karnataka with a view to assess the impact of deficit rainfall
coupled with high groundwater exploitation on water quality. A total of nineteen (ten
and nine from upper and lower portions of the watershed, respectively) bore wells
were selected, and samples were collected during the pre-monsoon seasons of 2011
and 2014. Results indicate that the groundwater is alkaline in nature with an average
pH of 8.70, and average electrical conductivity of 1.28 dS m . The general order of
abundance in respect of cations is Mg2+ > Na+ > Ca 2+> K+ , and in respect of anions is
HCO3 > Cl > SO4-2 . Cations were observed to be higher in the upper portion of the
watershed as compared to the lower portion. Increased individual ion concentration
of individual ions such as Na+ (77%), Mg2+ (61%) and HCO3 (100%) in 2014
compared to 2011 can be explained in terms of the three consecutive low rainfall
years coupled with higher groundwater abstraction. The dominant hydro chemical
facies of the groundwater in the watershed are Mg-HCO3 -Cl and Na-HCO3 -Cl.
During 2014, 21% of the samples were in the 'high salt hazard' zone, while the
groundwater in 50% of the watershed indicates a potential alkalinity hazard
expressed as residual sodium carbonate. These values indicate that the water should
be used with caution for irrigation during years of low rainfall in order to prevent the
soils from becoming salt-affected and reducing crop yields.
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Date 2020-06-10T09:53:57Z
2020-06-10T09:53:57Z
2016-10-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/36921
 
Language English
 
Relation Not Available;
 
Publisher Not Available