Phase 1 Baseline Plan - Detailed Design
With planning consent now agreed, there follows a detailed design stage during which the conditions to the consent will need to be cleared and further work undertaken prior to implementation. The staged build approach will mean that the waterway will initially support only small boats (canoes, punts and open launches), but all new structures are being designed for up to narrow boat standard, to allow larger boats to use the waterway as and when the necessary road bridge works allow. The Waterway Framework Policy adopted by the council in 2009 already requires that any new or rebuilt crossings over the channels must allow for sufficient headroom to eventually accommodate narrow boats. Some road bridge changes are likely to be necessary as part of the Area Action Plan for Maidenhead town centre which was adopted in 2011, with the Waterway included as one of five key projects.
|Technical Design and Desk Study Results|
The initial technical design for the restored waterways was undertaken in
conjunction with expert consultants Black & Veatch, our Waterways navigation consultant Paul
Wagstaffe, MBE, and the Environment Agency which provided pre-application advice.
|Levels and Surveys|
A study based on existing maps and records available to Black & Veatch was
completed some time ago and underpins the current plans and expected Phases of implementation.
Design discussions focused on two alternative navigation standards for the waterway. Accommodating
narrow boats is the more demanding option, due to the minimum bridge heights and air draft required,
and some combination of the two standards is expected to be used along different parts of the route
to reduce the need for costly bridge works:
Specialist engineers completed a levels survey of the York Stream and Moor Cut (Maidenhead Flood
Relief Channel) sections of the planned waterways in 2006, in order to confirm bridge and river bed
heights, plus the stream widths and conditions at the various bridges that cross the current channels.
All of the technical and outfall data acquired to date has been incorporated into provisional engineering drawings of the proposed route as part of the Phase 1 planning application. These include cross sectional drawings of the channel and bridges under which the stream passes, plus so called " Long Sections" showing the gradient of the channel along its route. The latter were used to assess alternative target water levels for the restored waterways, their impact on headroom and the extent of bridge modifications needed.
The overall construction programme for the waterways will take some years to implement and be paced by the necessary planning and other consents, plus inevitably our ability to attract the funding required. Subject to funding, we are hopeful that Phase 1 - allowing small craft around the town centre 'Ring' - can be completed around 2016 and that access below Green Lane from the Thames will also by then have been improved. Construction of the lock will be progressed only when the size and number of craft able to use the waterway require it. Later phases could involve the extension of the waterway to the north of Maidenhead and would take a further few years if considered feasible.