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The definition used on Admiralty Chart SC1179 and the Bristol Channel and Severn Cruising Guide is that the estuary extends upstream to Aust, the site of the Severn Bridge. On the north-west (Welsh) side, the rivers Wye and Usk flow into the estuary, and on the south-east (English) side, the River Avon joins at Avonmouth .
The Severn Estuary and most of the embayments around the channel are less than 30 ft (9 m) deep. Within the channel, however, there is an east–west valley 65–100 ft (20–30 m) deep, which is thought to have been formed by fluvial run-off during Pleistocene phases of lower sea level. [ 15 ]
To the northeast of the River Parrett's mouth, the Bristol Channel becomes the Severn Estuary, which has a tidal range of 14 metres (46 ft). [19] The rate and direction of flow of the Parrett is therefore dependent on the state of the tide on the River Severn. In common with the lower reaches of the River Severn, the Parrett experiences a tidal ...
The Severn Estuary has one of the highest tidal ranges in the world, up to 48 ft (15 m), [34] [35] [36] second only to the Bay of Fundy in Eastern Canada. [ 37 ] [ 38 ] The estuary's funnel shape, its tidal range, and the underlying geology of rock, gravel and sand, produce strong tidal streams and high turbidity , giving the water a notably ...
Magor Marsh is a 36-hectare (90-acre) wetland reserve, located on the Welsh side of the Severn Estuary. It is managed by the Gwent Wildlife Trust. It has a great variety of habitats, including damp hay meadows, sedge fen, reed bed, scrub and wet woodland. There are also numerous reens and a large pond.
The Severn bore is a tidal bore seen on the tidal reaches of the River Severn in south western England. It is formed when the rising tide moves into the funnel-shaped Bristol Channel and Severn Estuary and the surging water forces its way upstream in a series of waves, as far as Gloucester and beyond. The bore behaves differently in different ...
Severn Estuary (Sharpness) This is a route-map template for the Gloucester and Sharpness Canal , a UK waterway. For a key to symbols, see {{ waterways legend }} .
The Severn Barrage is any of a range of ideas for building a barrage from the English coast to the Welsh coast over the Severn tidal estuary. Ideas for damming or barraging the Severn estuary (and Bristol Channel) have existed since the 19th century. The building of such a barrage would constitute an engineering project comparable with some of ...