In this paper, an integrated model based on Finite Element Method (FEM) and Geographical Information Systems (GIS) has been presented for the runoff simulation of small watersheds. Interception is estimated by an exponential model based on Leaf Area Index (LAI). Philip two term model has been used for the estima-tion of infiltration in the watershed. For runoff estimation, diffusion wave equations solved by FEM are used. Interflow has been simulated using FEM based model. The developed integrated model has been applied to Peacheater Creek watershed in USA. Sensitivity analysis of the model has been carried out for various pa-rameters. From the results, it is seen that the model is able to simulate the hydrographs with reasonable ac-curacy. The presented model is useful for runoff estimation in small watersheds.
L. D. James and S. J. Burges, “Selection, calibration, and testing of hydrologic models,” Hydrologic Modeling of Small Watersheds (C. T. Haan, H. P. Johnson and D. L. Brakensiek (Eds.)), Monograph, ASAE, Michigan, USA, No. 5, pp. 437–472, 1982.
V. Jetten, “LISEM Limburg Soil Erosion Model,” Win- dows version 2.x, USER MANUAL, Utrecht University, Netherlands, pp. 7–7, 2002. See http://www.geog.uu.nl/lisem for further details, Accessed 26/08/2005.
J. Garbrecht, F. L. Ogden, P. A. Debarry, and D. R. Maidment, “GIS and distributed watershed models. I: Data coverages and sources,” Journal of Hydrologic En-gineering, Vol. 6, No. 6, pp. 506–514, 2001.
E. R. Vivoni, V. Y. Ivanov, R. L. Bras, and D. Entekhabi, “On the effects of triangulated terrain resolution on dis-tributed hydrologic model response,” Hydrological Proc-esses, Vol. 19, pp. 2101–2122, 2005.