Environ Freshford Mill – supplementary information on flood defences
An addendum to the Flood Risk Assessment is in preparation by Royal Haskoning DHV
which will include up-to-date flood risk information and the results of recent
hydrological and hydraulic modelling work undertaken.
The overall findings within the addendum include the flood levels next to the Freshford
Mill site under a range of scenarios, including the 1% annual probability flood with an
allowance for climate change:

29.6m AOD near the Fulling Mill

29.5m AOD near the Carding Mill

29.3m AOD near the Dye House and Millman’s House
These findings will confirm that the following finished floor levels (m AOD) on site will be
above the 1% annual probability flood with an allowance for climate change, except for
the Millman’s House, whose finished floor level is about the same as the 5% annual
probability flood.
Finished Floor Level
P Stubbington Land Surveys Ltd
Carding Mill
30.19
Dye House
30.32
Millman’s House
Perkin’s Court
MacIntyre Hudson surveyor
28.44
29.75
Letecombe Lodge/
Teasel Cottage
30.11
Ashe Barn
30.13
Weaver’s Cottage
30.16
Granary
30.21
Fulling Mill
William’s House
30.31
30.58
The loss of floodplain storage is to be investigated further in the next round of
modelling and design work, with level for level flood storage capacity to be provided
within the site.
For the avoidance of any doubt, all basements in the Carding Mill, the Fulling Mill and
the Dye House will be under the ownership and strict control of the Management
Company. No future occupation or use of such void basements by residents will be
entertained on any grounds by the Management Company, indeed this stipulation will
be legally covenanted. The only proposed exception is the Millman’s House, which would
be protected by flood walls under the proposed defences.
In the case of the Millman’s House, additional provisions would be incorporated into a
flood resilient design for the property such as the installation of easily cleaned stone
floors, raised electrical installation above 29.3m AOD, bedrooms located on the first floor
of the property (above 29.3m AOD), non return valves on foul drainage and external
pumping facilities incorporated within the site drainage plans to pump any external
surface water resulting from water percolation in the event of a prolonged flooding
episode.
Access and egress during a flood episode would be by means of a combination of the
main access road on the site leading to the main site entrance on Rosemary Lane
together with the raised deck between the Carding Mill, the Fulling Mill and the Dye
House which links to a walkway across part of the island to a landing point on the upper
reaches of Rosemary Lane, to allow access to the village on foot. Access and egress for
the Millman’s House will be provided by access to the deck to the north of Millman’s
House.
The proposed surface water drainage arrangements have been submitted.
A strict maintenance programme for all flood defence walls, together with walkways in
the vicinity of the river, as well as the weirs and sluice structure which fall under the
ownership of the Management Company, will be implemented by the management
company on behalf of residents. This will be based on the findings of the hydraulic study.