Project Description
Client: Jacobs
Categories: Flood Risk Mapping, Hydraulic Modelling, Hydrological Analysis, Hydrology
When: March-April 2019
Location: Oxfordshire, UK
The villages of Chalgrove and Stadhampton have been subjected to regular flooding from the Chalgrove Brook, Mill Lane Brook and River Thame with records dating back to the 19th century. In the past fifteen years, Chalgrove has experienced five separate flood events in 2008, 2009, 2012 and 2013 with the latest occurring in February 2014. This latter event resulted in extensive flooding to Mill Lane and the High Street, with flood water extending up Marley Lane, Fleming Avenue and Chapel Lane. Edenvale Young has undertaken several studies of the Chalgrove Brook in the past five years to assist the Parish Council with their neighbourhood plan and to extend the understanding of flood risk to the village. In 2018 the Environment Agency approached Jacobs and were appointed in conjunction with Edenvale Young to undertake a flood risk mapping study of the Chalgrove Brook between Watlington and Chiselhampton to assess flood risk in the area.
Project Details
The Chalgrove Brook originates in the Chiltern Hills and flows north-west through the nearby town of Watlington, before bifurcating through Chalgrove to form the High Street Brook and Back Brook. The brooks converge to the west of Chalgrove village, flowing through Stadhampton before reaching Chiselhampton and joining the River Thame. These brooks and associated tributaries form the primary source of fluvial flood risk to the villages and the houses and residents therein. The scope of work included:
- Preparation of topographic survey specification for the project and ground truthing of survey against LiDAR
- Review of historical flooding within Chalgrove
- Hydrological analysis including: gauge rating, revisions to AMAX series; ReFH and FEH Statistical Analyses
- Development of hydraulic model from survey and incorporation of previously surveyed cross sections into the new model
- Internal quality assurance of model
- Running the hydraulic model for a range of return periods
- Preparation of Flood Risk Mapping
- Development of a long list of options for the alleviation of flooding to the two villages
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