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GEOREF RECORD

Debris flow hazard mitigation for colluvium-filled swales

David R. Montgomery, Robert H. Wright and Thom Booth
Debris flow hazard mitigation for colluvium-filled swales
Bulletin of the Association of Engineering Geologists (August 1991) 28 (3): 303-323

Abstract

Debris flows originating in colluvial deposits within hillside swales cause significant property damage and loss of life in steep, soil-mantled environments. Colluvium-filled swales constitute mappable debris flow source areas and should be identified routinely as potential hazards in geotechnical feasibility and design-level investigations. Toward this end, we propose a swale classification system that incorporates the state of activity, slope, and depth of colluvial fill within a swale. Recognition and siting consideration allow for debris flow hazard mitigation by avoiding locations downslope of colluvium-filled swales, along low-order channelways, or on debris fans. Alternative mitigations, particularly appropriate for areas of existing development, include removal of colluvial deposits, subdrain installation, or downslope intervention to reduce the impact of a debris flow.--Modified journal abstract.


ISSN: 0004-5691
Coden: ENGEA9
Serial Title: Bulletin of the Association of Engineering Geologists
Serial Volume: 28
Serial Issue: 3
Title: Debris flow hazard mitigation for colluvium-filled swales
Affiliation: Univ. Calif., Dep. Geol. and Geophys., Berkeley, CA, United States
Pages: 303-323
Published: 199108
Text Language: English
Publisher: Association of Engineering Geologists, Dallas, TX, United States
References: 89
Accession Number: 1991-047118
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N37°47'60" - N38°19'60", W123°00'00" - W122°30'00"
N36°52'60" - N38°55'60", W123°34'00" - W120°55'00"
Secondary Affiliation: Harlan Tait Assoc., USA, United StatesOreg. State Univ., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 1991
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