Describe about the drainage filter.

Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN:9781305086272
Author:William P. Spence, Eva Kultermann
Publisher:William P. Spence, Eva Kultermann
Chapter38: Fire-suppression Systems
Section: Chapter Questions
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Describe about the drainage filter.

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The drainage filter can be defined as it is made up of granular material either natural or processed from deposits of sand, gravel, or rock. The aggregates are generally coarse aggregates of size greater than 5 mm and fine aggregates of size less than 5 mm. It ensures that the soil is properly aerated because if there is an excess of water in the field then it will affect the crops. It can be made either natural or artificial.

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