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Keywords: Entrance resistance.jpg Definition of entrance resistance to water flowing into subsurface tile drains en wikipedia 2009-10-16 R J Oosterbaan wikipedia en R J Oosterbaan original upload log page en wikipedia Entrance_resistance jpg 2009-10-16 12 12 R J Oosterbaan 547×324× 23172 bytes <nowiki>Symbol Q > Q </nowiki> 2009-10-15 15 27 R J Oosterbaan 569×351× 23537 bytes <nowiki>R J Oosterbaan self made Definition of entrance resistance of water to drains </nowiki> Drainage |