Abstract
This paper looks at the three-dimensional (3D) modelling and the benefits and drawbacks that it has, along with how it has been used on the Clays Lake flood storage reservoir and how it was used to improve the efficiency on-site. Clays Lake is one of three flood storage reservoirs on the Upper Mole, which comply with the requirements of the Reservoirs Act 1975, providing flood protection to Crawley town and Gatwick Airport. The reservoir was constructed on behalf of the Environment Agency and was completed in 2019, along with the issue of the preliminary certificate. The dam is formed of a 12 m high earth embankment with a crest length of 120 m. The reservoir has a storage capacity of 385 000 m3 above the permanent lake level. The flow is controlled by an orifice within the main penstock situated at the inlet structure. The main penstock can be opened to release flow more quickly if required. The outlet culvert is 1.8 m in diameter and has fish brushes installed along the invert to aid with fish passage. The downstream embankment slope contains a grasscrete spillway which is overtopped in a one in 1000 year event.
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