Assessment of Garmsar Optimum Drainage Design Using a Successful Strategy for Salinity Control
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 6
Abstract
A methodology and computer model is developed to determine economically optimum closed subsurface drainage systems in irrigated areas to control salinity. The model maximizes net benefits by comparing profit driven by crop yield to drain system cost and selects an optimum drain layout. The optimization methodology used is the simplex method. The simplex method was linked to the subsurface drainage model DRAINMOD and to the surface hydraulic model KINE. The selected optimum drainage system maximizes the difference between total revenue and the total cost of installation, operation and management of a particular drainage system. A 42 meter drain spacing at depth of two meter in local loamy soil was almost the optimum drain design. The salt balance of the area was measured before and after installation of drainage system. Salinity was reduced by 44% for first three years of operation. The optimization sub-program provides a workable and simple procedure for optimizing sound environmentally water management simulation models.
Authors and Affiliations
Majid Ehteshami
Keywords
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