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Assessment of Structural Flood-Control Measures on Alluvial Fans.
| 题名： | Assessment of Structural Flood-Control Measures on Alluvial Fans. |
| 关键词： | geomorphology, special flood hazard areas, hydrodynamic processes, floods, case studies, california |
| 摘要： | The Federal Emergency Management Agency (FEMA) prepares Flood Insurance Rate Maps (FIRMs) based on the results of Flood Insurance Studies (FIS). Thos studies determine the areas with a i-precent annual chance of being inundated. The flood is called the Base (100-year) Ffood by FEMA. The FIS must evaluate the existing flood conveyance system, including installed flood-control measures. The determination of the inundated area may depend on whether flood-control measures protect part of the floodplain. With increased development in the arid western portions of the United States, more people are being exposed to the extreme flood hazards associated with flash floods, mud and debris flows, high flow velocity, channel avulsion, erosion and channel migration on alluvial fans. The dominant fluvial processes operating on alluvial fans are episodic in nature and are poorly understood. Nevertheless, one must consider whether flood-control measures perform well on alluvial fans, and if so, whether their performance can be evaluated. / Supplementary Notes: Sponsored by Federal Emergency Management Agency, Washington, DC. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0814；103p |
| 报告类型： | 科技报告 |
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