AN EVALUATION OF SOME TILE-DRAIN DEPTH AND SPACING FORMULAE FROM THE PHYSICAL PROPERTIES OF SOME ONTARIO SOILS
[摘要] Soilphysicalpropertiesdeterminedonsixfine-texturedsoiltypesnearBramptonandChathamwereusedtosolveandevaluateformulaeforthedepthandspacingoftiledrainsproposedbyHooghoudt,Walker,Slater,andDumm.AttheChathamsite,measurementsofwater-tabledrawdownbetweentiledrainswererecordedtocomparewithNeal'swater-tableobservationsofadequatedrainage.Awidedifferenceinsoilpropertieswasexhibitedbetweenthetwostudysites.Noneoftheformulaeresultsofspacingagreedprecisely.Causesfordiscrepanciesbetweentheresultswereshowntobeduetotechnicaldifferencesinapplyingdatatotheformulaeandtoinherentdifferencesinderivationoftheformulae.Dataarepresentedshowingtheneedforaphysicalcriterionofadequatedrainage.
[发布日期] [发布机构]
[效力级别] [学科分类] 农业科学（综合）
[关键词] [时效性]
