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N015336CR

RIVER TAY CATCHMENT STUDYReport to Ove Arup and PartnersbyR c Johnson and A R Black77ŨV report is an official document prepared under contract between

N015336CR n Ove Ar up and Partners and the Natural Environment Research Council, h should not be quoted without permission of both the Institute of Hydrology an

d Ove Arup and Partners.Institute of Hydrology Unit 2Alpha CentreInnovation ParkStirlingI K9 4NFTel: 0786 447612Fax: 0786 44761434243ForewardI he Rive N015336CR

r l ay Catchment Study was commissioned by Tayside Regional Council after a senes of major flood events caused extensive damage throughout the region.

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The Study was centred around the development of two computational models: one an hydrological model of the Tay and Earn basins and the other an hydra

RIVER TAY CATCHMENT STUDYReport to Ove Arup and PartnersbyR c Johnson and A R Black77ŨV report is an official document prepared under contract between

N015336CR nd flood alleviation options. A wide range of data was required for the modelling from a senes of flood events.This report has been prepared by the In

stitute of Hydrology (IH) for Ove Arup and Partners as a sub-contract within the River Tay Catchment Study. The Terms of Reference (sec below) asked f N015336CR

or three reports to be prepared by IHReport I Methodology for estimating sub-catchment precipitation.A methodology was to be developed for estimating

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hourly rainfall data for ten selected flood events. It was expected that the method would derive relationships between rainfall and topography which c

RIVER TAY CATCHMENT STUDYReport to Ove Arup and PartnersbyR c Johnson and A R Black77ŨV report is an official document prepared under contract between

N015336CR nts in the fay and Earn catchments were to be selected which could be used in a subsequent modelling exercise to test the sensitivity of the flood wat

er levels to a range of environmental changes.Report 3 Flood event dataData for each of the ten events were to be obtained from all available sources N015336CR

to include: rainfall, snow cover, river flow and water levels in the lochs and reservoirs. These data were to be presented cither in tabular form or i

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n a suitable computer compatible form.This is the final report for the work carried out by 1H and is a compilation of Reports I, 2 and 3.Terms of Refe

RIVER TAY CATCHMENT STUDYReport to Ove Arup and PartnersbyR c Johnson and A R Black77ŨV report is an official document prepared under contract between

N015336CR e objective of the work is to provide a data base of precipitation, including any available information on snowfall and snow accumulation, and of gaug

ed flows for ten flood events in the Tay River Basin from which data will be selected for the calibration and verification of hydrological and hydraul N015336CR

ic models.Separate precipitation estimates are required for around 35 subcatchments of the Tay and Earn catchments. The sub-catchments are provisional

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ly indicated on Drawing 46769 S-04 and are listed in Tables 1 and 2. Flood flows are required for all available river gauging stations.The work compri

RIVER TAY CATCHMENT STUDYReport to Ove Arup and PartnersbyR c Johnson and A R Black77ŨV report is an official document prepared under contract between