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A Semi‐Empirical Investigation of the Influence of Flood‐Plain Storage on Flood Flow
Author(s) -
McCARTNEY M. P,
NADEN P. S
Publication year - 1995
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1995.tb00936.x
Subject(s) - hydrograph , flood myth , floodplain , hydrology (agriculture) , 100 year flood , environmental science , terrain , digital elevation model , geology , geotechnical engineering , geography , remote sensing , cartography , archaeology
A simple model is used to assess the effect of flood‐plain storage on flood flows, with a view to developing methods for general use in flood‐frequency estimation. Recent floods on the River Severn at Montford are ‘unrouted’ in order to determine the shape and magnitude of the hydrographs, provided that there had been no overtopping and all flows had been contained within the banks. The model used to unroute the hydrographs has, at its core, a relationship between water depth and flooded area derived from a coarse (50 m) digital terrain model developed from Ordnance Survey 1:50 000 maps. The implications for flood‐frequency curves at sites downstream from significant flood‐plain storage are discussed.