Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T1-35 P-1384
Catchment–Storage-Command Relationship for Increasing Water
Productivity in Micro-Watershed of Raichur District
R. H. Rajkumar* 1 , M.R. Umesh 1 , S.N. Bhatt 1 , M.S. Shirahatti 2 and G. Ravindra Chary 3
1 AICRP on Dryland Agriculture, MARS, UAS, Raichur, Karnataka
2 AICRP on Dryland Agriculture, RRS, Vijayapura, UASD, Karnataka
3 AICRP on Dryland Agriculture, CRIDA, Hyderabad, Telangana State
*halidoddiraju@gmail.com
The long-term field experiment was conducted to find out the catchment–storage-command
relationship for enhancing water productivity in micro catchment of UAS campus, Raichur. A
square shaped (trapezoidal section) farm pond of size 18x18 m top width 10x10 m bottom width
and2.70 m depth was excavated in the year 2017 in the dry land research plot at UAS, Raichur
campus. The total capacity of the pond was 547.0 m 3 . The catchment and command area were
delineated as 8 and 1 ha respectively. During the year 2020, 61 number of rainy days were
recorded, of which, 19 numbers were runoff causing rainfall events as a result, the pond was
filled and nine times and over flowed after exceeding its full capacity of 547.0 m 3 . This shows
that, there is a scope to harvest more quantity of runoff water. Most of the runoff events were
occurred during the month of May, June, July, August, September, and October. The May, June,
July, August, September, and October months have received the rainfall of 130.4, 128.0, 296.6,
164.4, 317.6, 179.6 mm respectively. Due to good rain in these months, the Pigeonpea crop
during Kharif and groundnut crop during Rabi stand was good due to enough moisture in the
soil profile. The water balance of the pond revealed that 438.68 m 3 of water was lost through
evaporation and seepage losses together during the period from 27-09-2020 to 24-03-2021 (6
months). The remaining 108.32 m 3 of water which was available in the pond was used for
supplemental irrigation to the groundnut crop with an irrigation depth of 1.08 cm for a 0.485 ha
area which amounted to 109 m 3 of water. The irrigation was given on two days i.e on 25-03-
2021 and 26-03-2021. The sediment yield was also calculated by collecting the runoff samples
from the runoff events. The highest amount of sediment was recorded on 19-09-2021 which is
0.35 t/ha against the rainfall of 83.6 mm and runoff volume of 1526.6 m 3 .
Resilience through land and water management interventions, water management and governance
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