@article{oai:omu.repo.nii.ac.jp:00009261,
 author = {MURASHIMA, Kazuo and OGINO, Yoshihiko},
 journal = {Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and biology},
 month = {Mar},
 note = {application/pdf, The performance of a steady state method, proposed by the authors, for determining subsurface drain spacing in paddies was examined and evaluated as compared to a non-steady state method. The steady formula, in which a certain drainage rate (design drainage rate) was used, became equivalent to non-steady formula under the condition that excess water in topsoil is to be removed within a day, a twenty four hour period. It was, however, revealed experimentally that to represent porosity of shallow topsoil used in the non-steady formula, with a single value was difficult, and consequently, the non-steady formula gave unstable spacing. The steady method, on the other hand, performed and determined spacing without any soil parameters even if drainage testing was carried out., Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and biology. 1992, 44, p.41-48},
 pages = {41--48},
 title = {Comparative Study on Steady and Non-Steady state Formulae of Subsurface Drain Spacing : Design on Subsurface Drainage in Paddies (I)},
 volume = {44},
 year = {1992}
}