Location: Sugarcane Research Unit
Project Number: 6410-13000-010-07
Start Date: Apr 01, 2010
End Date: Mar 31, 2015
• The ARS investigator will provide Fortran program code changes made in DRAINMOD ver. 3 (that did not include nutrient transport, only hydrology) during the late 1980’s to simulate automatic feedback-control adjustments of the outlet weir elevation, or desired controlled water level, at the subsurface drainpipe outlet in the controlled-drainage and subirrigation modes for automated water table depth control with respect to normal increases in crop root-zone depth during the growing season, and major changes in water table depth due to rainfall or drought. • The NSCU investigators will employ a Research Associate to assist in making the required program code changes/inserts in DRAINMOD-N2 and to conduct the verification and specified preliminary runs under direction of NCSU investigators. Note: The modified model should retain the procedure (routine) currently in DRAINMOD-N2 to change elevation (depth) of the outlet weir a specified distance via a step-wise adjustment on Julian date(s) listed in the input data set. • The ARS investigator will periodically review simulation results with NCSU investigators and Research Associate to ensure the automated operation is properly simulated with the modified model, and to make suggested changes as/if needed. • Upon completion of the above steps, a technical paper on the modified model will be prepared by the NCSU and ARS investigators for publication, and the paper should outline the additional steps needed to validate/calibrate the modified model for major geographic regions to account for differences in topography, climate, soils, crops, cultural and fertility practices, and water management system designs.