The 48,900 ha Little Vermillion River (LVR) watershed located in East Central Illinoisis predominantly tile drained by random tile drainage systems. The entire watershed drains intothe Georgetown Reservoir which is a source of water supply to its population of 10,000. Sub-surfacetile flow and crop management data have been collected during last seven years fromdifferent tile-drained fields located in various parts of this watershed. DRAINMOD and RootZone Water Quality Model (RZWQM) were used to simulate the tile flow at six of these fieldsunder different tillage and cropping management practices, for years 1993-1998. Most sensitiveparameters of each of these models were calibrated for different fields using measured data fortwo successive crop years consisting of corn and soybeans respectively. The calibratedparameters were then used to simulate tile flow for remaining years for each field. Resultsindicate that both model simulate tile flow within an acceptable range. However, DRAINMODsimulated results are closer to the actual observed values. Detailed results are presented in thispaper.
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