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IMPACT OF RAIN WATER HARVESTING ON WATER RESOURCE POTENTIAL IN ARVARI RIVER CATCHMENT

KrishiKosh

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Title IMPACT OF RAIN WATER HARVESTING ON WATER RESOURCE POTENTIAL IN ARVARI RIVER CATCHMENT
M.Sc.
 
Creator SRIKANTA MAHATO
 
Contributor A. K. Mishra)
 
Subject irrigation, surface water, precipitation, area, water, groundwater table, land resources, runoff, harvesting, wells
 
Description A study was conducted in Arvari River catchment in Alwar district of
Rajasthan state of India with the objectives to quantify the hydrologic impacts of
construction of large scale Rain Water Harvesting Structures (RWHS) for
assessment of water resource potential for future utilization in agriculture.
Hydrologic impacts of Rain Water Harvesting (RWH) was quantified in the 476 km2
semi-arid Arvari river catchment where over 366 RWHS have been built since 1985.
A high degree of spatio-temporal variations in average annual rainfall in was
noticed. The C.V. ranged from 0.37 to 0.52 for space and 0.16 to 0.49 for time;
respectively. In the present study an attempt has been made to estimate the available
water based on long term average rainfall. It was found that 109.3 MCM water could
be harvested from the entire catchment but only 3.78 MCM water could be harvested
from the existing RWHS. Therefore, there exists ample possibility to harvest the
excess runoff water from the catchment. The surface runoff volumes for potential
recharge (Rep) of the selected RWHS were also estimated. The minimum stored
volume of 12000 m3 was assessed in the year 2011 in Jhiri Johad, the Sankara bandh
stored approximately 50000 m3 during the same year. The Rep varied due to the
varying catchment area of RWHS as well as the change in rainfall in corresponding
years.The spatial variability of decadal ground water table fluctuation ranged
between 5.67 to 33.6 m bgl during 1982-1991. While the upper and middle reaches
of the catchment have shown a rise in the water table the lower reaches have shown a
constant decline in the water table of approximately 2 m during 1992-2001 over the
preceding decade. In 2002-2012 however, in the SW side of the catchment a sudden
drop of 54 m was observed as a result of combination of factors. Larger recharge
(Rep) volumes during 2012 (>30 % as compared to 2011) could be attributed to a 20
% increased amount of rainfall in 2012 as compared to 2011. Some structures could
retain water up to 273 days indicates that there was a great possibility of utilizing
harvested surface runoff. The construction of RWHS was highly non uniform due to
catchment characteristics and settlements. After the detailed survey and study it was
proposed to construct 10 numbers of rockfill dams, 11 check dams and one small
reservoir to harvest the excess runoff from the catchment. New engineering
structures as well as appropriate bio-engineering measure have also been suggested
ii
for large scale RWH and resources conservation depending upon the slope and
catchment characteristics.
 
Date 2016-04-30T14:15:50Z
2016-04-30T14:15:50Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65686
 
Relation T-8850;
 
Format application/pdf
 
Publisher IARI, Division of Agricultural Engineering Indian Agricultural Research Institute, New Delhi