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Evaluation of Two Drainage Models in South-West Iran

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB Proceedings, 13-16 June 2010  IDS-CSBE-100027.(doi:10.13031/2013.32106)
Authors:   Fatemeh Samipour, Maliheh Rabie, Kourosh Mohammadi, Mohammad Hossein Mahdian, Abd Ali Naseri
Keywords:   Drainage Modeling, DRAINMOD, SWAP, Crop Yield

Selecting the correct drain spacing and depth is an important decision in designing a drainage system. Drainage simulation models can be used to determine the combination of depth and spacing to optimize the performance of the system. In this research, two widely used drainage simulation models, DRAINMOD and SWAP, were used in a sugarcane farm in south-west of Iran (Khozestan Province). Soil characteristics as well as climatological data, irrigation depths and schedules, and water table information for 2000 and 2001 were used to calibrate and validate both models. The validated models were used to find the optimum drain spacings and depths based on crop production and drainage water volume. Maximum crop production and minimum drainage water were the objectives of the design. Simulated water tables for both models were satisfactory with the regression coefficient of 0.95 and 0.90 and RMSE between simulated and observed water tables were 18.1 and 19.2 cm for DRAINMOD and SWAP, respectively. DRAINMOD under-estimated the drainage water but SWAP overestimated it. A relative yield of 80 % was achieved when drain spacing and depth were set to 25 m and 1.60 m, respectively using SWAP. For DRAINMOD, these values were 15 m and 1.15 m, respectively.

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