drainage

[drey-nij]

Origin:
1645–55; drain + -age

overdrainage, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
drainage (ˈdreɪnɪdʒ)
 
n
1.  the process or a method of draining
2.  a system of watercourses or drains
3.  liquid, sewage, etc, that is drained away

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

drainage
1650s, from drain + -age.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

drainage drain·age (drā'nĭj)
n.
The removal of fluid or purulent material from a wound or body cavity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

drainage

in agriculture, the artificial removal of water from land; drainage is employed in the reclamation of wetlands, in the prevention of erosion, and as a concomitant of irrigation in the agriculture of arid regions

Learn more about drainage with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Make sure the location has good drainage, since you don't want water to collect
  around the frame after every rain.
It has a primary school, running water and some drainage.
For example they over filled one tank and gasoline was running down the street
  and into the water drainage system.
Decades of drainage projects has vastly decreased the recharge rate of the
  aquifer.
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