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Spatial and temporal estimation of runoff in a semi-arid microwatershed of Southern India

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Title Spatial and temporal estimation of runoff in a semi-arid microwatershed of Southern India
Spatial and temporal estimation of runoff in a semi-arid microwatershed of Southern India
 
Creator ICAR_CRIDA
 
Subject ARCGIS, Curve number, LULC, SCS-CN method, Slope, Surface runoff
 
Description Not Available
In a semi-arid microwatershed of Warangal
district in Southern India, daily runoff was estimated
spatially using Soil Conservation Service (SCS)-curve
number (CN) method coupled with GIS. The groundwater status in this region is over-exploited, and precise
estimation of runoff is very essential to plan interventions for this ungauged microwatershed. Rainfall is the
most important factor governing runoff, and 75.8 % of
the daily rainfall and 92.1 % of the rainy days which
occurred were below 25 mm/day. The declines in rainfall and rainy days observed in recent years were 9.8 and
8.4 %, respectively. The surface runoff estimated from
crop land for a period of 57 years varied from 0 to
365 mm with a mean annual runoff of 103.7 mm or
14.1 % of the mean annual rainfall. The mean annual
runoff showed a significant reduction from 108.7 to
82.9 mm in recent years. The decadal variation of annual
runoff from crop land over the years varied from 49.2 to
89.0 % which showed the caution needed while planning watershed management works in this
microwatershed. Among the four land use land cover
conditions prevailing in the area, the higher runoff
(20 % of the mean annual rainfall) was observed from
current fallow in clayey soil and lower runoff of 8.7 %
from crop land in loamy soil due to the increased canopy
coverage. The drought years which occurred during
recent years (1991–2007) in crop land have increased
by 3.5 %, normal years have increased by 15.6 %, and
the above normal years have decreased by 19.1 %. This
methodology can be adopted for estimating the runoff
potential from similar ungauged watersheds with deficient data. It is concluded that in order to ensure longterm and sustainable groundwater utilization in the region, proper estimation of runoff and implementation of
suitable water harvesting measures are the need of the
hour.
Not Available
 
Date 2020-02-26T08:11:32Z
2020-02-26T08:11:32Z
2015-07-30
 
Type Technical Report
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/33386
 
Language English
 
Relation Not Available;
 
Publisher K. V. Rao, M. Osman, G. R. Chary, Pushpanjali, K. Sammi Reddy, Ch. Srinivasa Rao