Field tests were conducted to calibrate the existing SCS design equation in determining field border length using field
data of different field lengths during 2nd and 3rd irrigations under local conditions. A single ring infiltrometer was used to
estimate the water movement into and through the irrigated soil profile and in estimating the coefficients of Kostiakov
infiltration function. Measurements of the unit discharge and time of advance were carried out during different
irrigations on wheat irrigated fields having clay loam soil. The collected field data were used to calibrate the existing
SCS design equation developed by USDA for testing its validity under local field conditions. SCS equation was
modified further to improve its applicability. Results from the study revealed that the Kostiakov model over predicted
the coefficients, which in turn overestimated the water advance length for boarder in the selected field using existing
SCS design equation. However, the calibrated SCS design equation after parametric modification produced more
satisfactory results encouraging the scientists to make its use at larger scale.
M.R. Choudhary, S. Mahmood, U.S. Mustafa. (2009) Field Calibration And Modification Of Scs Design Equation For Predicting Length Of Border Under Local Conditions , , Volume-46, Issue-3.
