Determination of water table in evaluation of subsurface drainage using electronic modern method

Document Type : Original Article

Authors

1 Ph.D. Student of Irrigation and Drainage Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran..

2 Sanru

3 Assistant professor of Geophysics, Islamic Azad University, Chalus branch

Abstract

Using of piezometers for determining flow path, water head in different layers and designing subsurface drainage systems is cost and time consuming. Therefore, to increase speed, accuracy and decrease research expenses, using the different methods of geophysics exploration is efficient. In this study, to determine water table between two subsurface drains, an electromagnetic device was used that invented in 2008. The research was done in paddy fields of Sari Agricultural Sciences and Natural Resources University during dry period (July) and wet period (May) in 2014. This pilot has three subsurface drainage system with different depth and spacing. Each system has 9 observation well with 1 m depth and 9 piezometer with depths among 0.2 to 5 m. The data measured with this device were evaluated with water table data obtained from piezometer and observation well with T-test method. The results showed no significant difference between two methods. The maximum error in electromagnetic device related to piezometer and wells were 11 and 13 %, respectively. So, this device can be used in measuring necessary data for subsurface drainage design and evaluation and also collecting and expanding point data. These characteristics will be trepanned to decrease cost and time consuming and minimizing interface of subsurface layers non homogeneity in subsurface drainage modeling.

Keywords


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