User Manual for Surface Water Yield Model (SWYMOD)

Abstract

Simple model or procedure for estimating surface runoff / water yield from the catchments with readily available input data, is required for soil and water conservation engineers. Building Surface Water Yield Model (SWYMOD) integrating pond water balance and SCS curve number method, is an attempt to generate the curve numbers for existing land uses based on the observed and predicted pond water depths. The iterative process developed in the form of a model is very user friendly with minimum input data requirement. The dataset include daily rainfall, hydrologic soil group, land use distribution, observed pond depths, seepage, evaporation etc. We hope the model runoff will be useful to the practicing scientists, engineers of SWC and all other field functionaries of IWMP and MGNREGS. The authors are grateful to Dr.A.K.Singh, DDG(NRM), ICAR, New Delhi for his guidance in the present work. We are indeed thankful to the field staff namely, Shri V.Sreeramulu, Farm Superintendent, B.Kurmaiah, T1, B.Rama Krishna, and Mr. Yadiah, field staff of Gunegal Research farm for their help in recording the data for validation of model. The help and co-operation of CAO, SFAO and their staff are fully acknowledged for printing the bulletin. We invite comments and suggestions from all stakeholders in making improvements in feature edition of this bulletin.