The hydrological response of two upland catchments : implications for flood estimation
PublisherUniversity of Lancaster
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This thesis describes an investigation of the flood response of Burnes Gill and Force Beck, two upland catchments in the North West Pennines. The objectives of the study were to examine whetler an understanding of the catchment processes which generate flood runoff can be used to improve the structure of existing flood estimation techniques or their. application at the ungauged site. Rainfall, discharge and soil moisture were measured over a period of two years on two small catchments with contrasting topography and geology. Flood response was defined by the magnitude and volume of separated discharge and related to rainfall depth, intensity and several direct and indirect estimates of catchment wetness. The average response was lower and less dependent on antecedent wetness on Burnes Gill, one of the steepest gauged catchments in the United Kingdom than on the flatter Force Beck catchment. This difference in response was related to the contributing areas of the two catchments, defined by neutron probe measurements and field survey. The implications of these results for flood estimation at the ungauged site in the United Kingdom are illustrated by considering the Transport and Road Research Laboratory and Flood Studies Report flood design techniques.