IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Simplified drain-spacing computation method to reduce groundwater table
Simplified drain-spacing computation method to reduce groundwater table
Author : SUNJOTO S.
A great deal of this research work has been carried out in developing a computation method which is simple and reliable for drain spacing formula. The common practice for controlling the ground water table was using an open ditches system. Recently, modern agriculture has not used these systems and it was replaced by pipe drains. Hooghoudt developed a technique to compute the space between pipe drainage using a combination of tables and equation. Other researchers improved this technique of computation using graphics and equations. This paper attempted to find a simple technique of computation for drains spacing using equations without tables or graphics. The result of computation with the equal data shows a marginal deviation to the existing methods about 5 % for the 20 cm diameter of pipe as a computation standard in this example. Some executions can’t be done by existing methods for these some example data, like Hooghoudt’s solution by table method due to in this paper provided only table for ro = 0.10 m and Dagan method can only compute 0.05 m < ro < 0.15 m for this example data, and all of them can’t compute the drains dimension of ro=½b=½hw= 0 m except the proposed methods. Hooghoudt’s solution by equation method is unreliable formula because the variation of ditch depth gives the constant drains spacing value and this method independent to the width of ditch base. Kirkham, Dagan and Ernst methods are more reliable because the variation of pipes or ditches dimensions show the various drain spacing value, even though the comparison results are not significant. The proposed methods are the most reliable than the others because the variation of pipes or ditches dimensions of drains gives the realistic value of drain spacing results. The of proposed methods using equations without trial and error steps, nor graphic, nor table, thus it is easier to be conducted and it can be considered as method of drain spacing computation.
File Size : 1,325,036 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 20/08/2015
Download Now