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专利名称：Step silt terrace erosion prevention发明人：John Thomas Nolan申请号：US09236739申请日：19990125公开号：US063222B1公开日：20011127
专利附图：
摘要：The Silt terrace erosion prevention inventions called STEP, is directed to a lowcost process to reverse soil erosion in a farm field by retaining the silt in a naturalwatercourse to form grassy terraces behind a series of dam structures built with dirt-filled, non-biodegradable, plastic sacks arranged across the bed of the gully in a “V”
shape pointing upstream.
申请人：NOLAN JOHN THOMAS
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