翻訳と辞書 Words near each other ・ Mount Abraham (Maine) ・ Mount Abraham (Vermont) ・ Mount Abram ・ Mound of Butter ・ Mound of Dam Dam Peer ・ Mound of Glory ・ Mound of Immortality ・ Mound of Sound ・ Mound of the Hostages ・ Mound of the Unbeaten ・ Mound Prairie Township ・ Mound Prairie Township, Houston County, Minnesota ・ Mound Prairie Township, Jasper County, Iowa ・ Mound Road Engine ・ Mound Station, Illinois ・ Mound system ・ Mound Township ・ Mound Township, Bates County, Missouri ・ Mound Township, Effingham County, Illinois ・ Mound Township, Illinois ・ Mound Township, McDonough County, Illinois ・ Mound Township, McPherson County, Kansas ・ Mound Township, Rock County, Minnesota ・ Mound Township, Warren County, Indiana ・ Mound Valley ・ Mound Valley Township, Labette County, Kansas ・ Mound Valley, Kansas ・ Mound Westonka High School ・ Mound, Louisiana ・ Mound, Minnesota Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mound system ： ウィキペディア英語版 Mound system A mound system is an alternative to the traditional rural septic system drain field. The mound system is an engineered drain field used in areas where septic systems are more prone to failure due to having extremely permeable or impermeable soils, soil with shallow cover over porous bedrock, and soils that have a high seasonal water table.〔Converse, J.C., and J.E. Tyler. 2000. "WISCONSIN MOUND SOIL ABSORPTION SYSTEM:." Accessed on 10 Oct. 2007. (Link )〕 The primary waste liquids cleaning and purification action in a drain field is performed by a biofilm in the loose fill surrounding the perforated drain tile. If the soil permeability is too low, liquid is not absorbed fast enough, resulting in surface ponding of unsanitary liquids. If the soil permeability is too high, or is exposed to fractured bedrock, the wastewater quickly penetrates down to the water table before the biofilm has time to purify the water leading to contamination of the aquifer. In either situation, the mound system provides an ideal habitat for the biofilm and has the correct permeability to assure slow absorption of effluent into the mound before exiting as purified water into the surrounding environment. ==History== The mound system was originally designed in the 1940s by the North Dakota College of Agriculture.〔 It was known as the Nodak Disposal System. In 1976 the University of Wisconsin studied the mound systems under the university's Waste Management Project. This project published the first design manual indicating the appropriate site conditions and design criteria for mounds. In 2000 a new manual was released.〔 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「Mound system」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.