Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Agricultural drain envelope design and laboratory testing
Based on a thorough review of the available literature on design of agricultural drain envelopes, design criteria for granular, organic and synthetic drain envelopes are given. These are based on laboratory and field experience. Recent guidelines for design of filtering envelopes by the SCS are incorporated in the recommendations for granular drain envelope design. Few criteria exist for organic envelopes. Organic envelopes are mostly suitable for short-term or temporary uses. A large array of criteria for synthetic (incl. geosynthetic) envelopes is available, but some essential simple guidelines are found adequate for non-life threatening situations such as agricultural drains. An alternative to the use of the criteria mentioned above, is the use of indicator tests in the laboratory that test the materials considered for the appropriate situations. Tests such as the Long-Term Flow Test, the Gradient Ratio Test, the Hydraulic Conductivity test, answer questions concerning the filtration characteristics of the material selected, but are not uniform in their approach. They need not be uniform in approach as testing is done generally qualitatively (for comparison). Nevertheless a uniform approach for testing soil-envelope combinations is advocated and outlined in the article.
Agricultural drain envelope design and laboratory testing
Based on a thorough review of the available literature on design of agricultural drain envelopes, design criteria for granular, organic and synthetic drain envelopes are given. These are based on laboratory and field experience. Recent guidelines for design of filtering envelopes by the SCS are incorporated in the recommendations for granular drain envelope design. Few criteria exist for organic envelopes. Organic envelopes are mostly suitable for short-term or temporary uses. A large array of criteria for synthetic (incl. geosynthetic) envelopes is available, but some essential simple guidelines are found adequate for non-life threatening situations such as agricultural drains. An alternative to the use of the criteria mentioned above, is the use of indicator tests in the laboratory that test the materials considered for the appropriate situations. Tests such as the Long-Term Flow Test, the Gradient Ratio Test, the Hydraulic Conductivity test, answer questions concerning the filtration characteristics of the material selected, but are not uniform in their approach. They need not be uniform in approach as testing is done generally qualitatively (for comparison). Nevertheless a uniform approach for testing soil-envelope combinations is advocated and outlined in the article.
Agricultural drain envelope design and laboratory testing
Vlotman, W.F. (Autor:in)
1998
23 Seiten, 39 Quellen
Aufsatz (Konferenz)
Englisch
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