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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Drainage equation ： ウィキペディア英語版 Drainage equation A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design. A well known steady-state drainage equation is the Hooghoudt drain spacing equation. Its original publication is in Dutch.〔S.B.Hooghoudt, 1940 (in Dutch). ''Algemene beschouwing van het probleem van de detailontwatering en de infiltratie door middel van parallel loopende drains, greppels, slooten en kanalen''. No. 7 in de serie: Bijdragen tot de kennis van eenige natuurkundige grootheden van den grond. Bodemkundig Instituut te Groningen. Rijksuitgeverij Dienst van de Nderlandse Staatscourant. 's-Gravenhage, Algemeene Landsdrukkerij.〕 The equation was introduced in the USA by van Schilfgaarde.〔J. van Schilfgaarde, 1957. ''Approximate solutions to drainage flow problems''. In: J.N.Luthin (Ed.), Drainage of agricultural lands, p.79-112. Agron. Monogr. 7. ASA, Madison, WI, USA.〕 ==Hooghoudt's equation== Hooghoudt's equation can be written as:.〔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〕 :Q L2 = 8 Kb d (Di - Dd) (Dd - Dw) + 4 Ka (Dd - Dw)2 where: * Q 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Drainage equation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.