By R. Ashley, S. Garvin, E. Pasche, A. Vassilopoulos, C. Zevenbergen
One of many results of worldwide weather swap is the expanding variability of maximum flood occasions and cyclones. present measures to mitigate flood affects, quite within the city surroundings, are in response to previously-planned flood chance durations and not supply adequate protection. Being ready for unforeseen alterations and severe flood occasions asks for a paradigm shift in present recommendations to prevent and deal with flood mess ups. on the way to stem the expanding influence of city floods, an important reconsider of present making plans and flood administration rules and perform is needed, bearing in mind diverse spatial and temporal scales. This e-book addresses a huge spectrum of correct concerns within the rising box of city flood administration. it might act as a stimulus for extra learn and improvement in city flood administration whereas informing and interesting stakeholders within the advertising of built-in and cooperative techniques in water management. An interdisciplinary method so one can be of curiosity to all those people who are energetic in water, danger and concrete administration.
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Additional info for Advances in Urban Flood Management (Balkema: Proceedings and Monographs in Engineering, Water and Earth Sciences)
National map of the centreline of all watercourses. 2. Levels of protection and flood return period. g. 2%) • National Flood and Coastal Defence Database provides a national dataset of defence location, type and condition. • National database of locations of residential, business and public buildings. • Land use maps and agricultural land classification. 2). 5 TYPES OF FLOOD EVENT The differing types of watercourse, runoff regimes, flow processes and land uses all combine with physical geography to create various types of flood event.
3) Flash floods in hilly and mountainous regions. 4) Short duration, high intensity thunderstorm driven local flooding on small streams entirely within the urban areas. 5) Sewer flooding associated with blocked sewer overflows to larger rivers or surcharging through manhole covers. 6) Groundwater flooding can be a result of prolonged heavy rainfall in certain geological conditions. 1 Rain and snow melt in mountain areas Exceptional conditions in the French Alps have caused extreme flood events such as the millennial inundation of the Guil River in 1957 (Tricart, 1975), which induced a runoff coefficient greater than 1 due to rain falling on snow cover.
These are: 1) In mountain areas, the effects of heavy, warm spring rains on winter snow causing sudden melting. 2) Regional weather systems that are blocked by high pressure systems and produce widespread heavy rain over large sections of major river catchments. 3) Flash floods in hilly and mountainous regions. 4) Short duration, high intensity thunderstorm driven local flooding on small streams entirely within the urban areas. 5) Sewer flooding associated with blocked sewer overflows to larger rivers or surcharging through manhole covers.