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Groundwater mounding
This recommendation is supported by an analysis of Hooghoudt's equation <ref>H.P.Ritzema, 1994, Subsurface flow to drains. Chapter 8 in: H.P.Ritzema (ed.), Drainage Principles and Applications, Publ. 16, pp. 236-304, International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands. ISBN 90-70754-33-9</ref><ref>W.H. van der Molen en J.Wesseling, 1991. A solution in closed form and a series solution to replace the tables for the thickness of the equivalent layer in Hooghoudt's drain spacing equation. Agricultural Water Management 19, pp.1-16</ref><ref>van Beers, W.F.J. 1976, COMPUTING DRAIN SPACINGS: A generalized method with special reference to sensitivity analysis
and geo-hydrological investigations, International Institute for Land Reclamation and Improvement (ILRI) Wageningen, The Netherlands</ref> in relation to loamy or clayey native soils, where ''K<sub>media</sub>''>>''K<sub>soil</sub>'', finds the first term of the numerator negligible, so that the original equation:
<math>Drain\ spacing=\sqrt{\frac{8K_{soil}Hd\left(D_{i}-D_{d}\right)\left(D_{d}-D_{w}\right)+4K_{soilmedia}\left(D_{d}-D_{w}\right)^{2}}{q}}</math>
may be simplified to:
<math>Drain\ spacing=\sqrt{\frac{4K_{media}\left(D_{d}-D_{w}\right)^{2}}{q}}</math>
*[[Flow-through planters]],
*[[Green roofs]], or
*[[Blue roofs]].
 ==Oak Ridges Morraine Moraine Groundwater Monitoring Program==[[File:ORMGP.JPG|thumb|Depth to groundwater raster and contoursfrom the ORMGP]]

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