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E-book Spillways on River Levees

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Penilaian

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Levees are typically very long structures built above the natural ground level to either channel water or prevent it from flowing through. Excluding those built along canals, levees are designed to protect certain areas against river or marine flooding. This handbook only addresses riverine flood protection levees that pro-vide partial or total protection against floodplain inundation.As we will see later, levees may protect against certain floods while only delaying stronger ones. But this is a consequence of the definition rather than part of the definition. The main issue is that the presence of a river levee is a double-edged sword: it offers protection against small- or medium-sized floods but creates a hazard during strong or extreme floods or when it is poorly maintained. If the levee fails, the resulting flood wave may cause even more damage in the floodplain than if there had been no levee at all. Earthen levees offer particularly low resis-tance to overflows. They may also breach before overflowing because of internal erosion, toe scour, or sliding.These levees (sometimes called “dry levees”) are seldom subject to hydraulic load-ing, much like flood retention dams or basins. River levees are generally made from earthfill taken from the riverbed or the sur-rounding area. They are sometimes built of masonry or concrete, particularly on urban sites, in which case they are sometimes called dikes. Earthen dams are also sometimes called levees, but this term is incorrect and should be avoided. A dam is built across a river to block at least the riverbed, and frequently the floodplain and beyond. A levee, on the other hand, never blocks the riverbed.Levees may connect several natural topographical features such as hillsides, prom-ontories, or terraces. Although these natural features are not considered levees, we should analyse their resistance in the same way as human-made levees. We must clearly define the area that is being protected from flooding by one or more levees and potentially some natural features. All these components taken together form what we call a leveed system.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

627 DEG s

Penerbit

France : éditions Quae., 2021

Deskripsi Fisik

179 hlm

Bahasa

English

ISBN/ISSN

9782759232857

Klasifikasi

627

Tipe Isi

text

Tipe Media

computer

Tipe Pembawa

online resource

Edisi

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Subjek

Hydraulic Engineering

Info Detail Spesifik

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Pernyataan Tanggungjawab

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Versi lain/terkait

Lampiran Berkas

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