Lower Itchen Options Appraisal
Reference ocds-b5fd17-3e277dda-09b8-4410-b5dd-6203f792444b · Environment Agency
Awarded to Ove Arup & Partners Limited Primary for £87,573.
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Amounts and figures
Description
The River Itchen SSSI/SAC is an internationally renowned chalk stream, and despite being highly designated, is in unfavourable condition. One reason being the condition of the physical channel, and another linked to the status of the Itchen Atlantic salmon population, now deemed to be in crisis and at high risk of extinction. The Lower Itchen, at Woodmill, Southampton, has been significantly modified historically to manage water for navigation, milling, and fishing activities. As a result of this, there are several water control structures: a sluice gate, 2 penstocks, and a sea door that are near the end of their design-life, and a technical fish pass (known as a Denil plain baffle fish pass). In addition, upstream, the true right bank, retaining the river in an artificial, perched state through Riverside Park, is increasingly permeable and has developed large breaches. This allows a significant proportion of the river to drain from its main (artificial) channel to follow a more natural course through the floodplain. There is an increasing risk that the whole river will continue to change course over time, and this will be expediated through bank failure. There are multip…
Awards
| Awarded to | Amount | Date |
|---|---|---|
| Ove Arup & Partners Limited Primary | £87,573 | 3 February 2025 |
Official publications
| Medium | Reference | Date |
|---|---|---|
| FTS | 3907218a-74ac-4096-a6f9-b412475d0531-824055 | 6 February 2025 |
| Contracts Finder | 3907218a-74ac-4096-a6f9-b412475d0531-824055 | 6 February 2025 |
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- The contracting authority is Environment Agency (United Kingdom).
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