South Cumbria Catchment Management Group & Project Working Group: Evidence & Decision Document Community: Troutbeck Bridge Version: May 2019

Contents Flood Risk & Drought ........................................................................................................................................................ 2

Evidence Checklist ..................................................................................................................................................... 2

Existing Projects or Interventions for Flood Risk .......................................................................................................... 4

Catchment Maps: .......................................................................................................................................................... 5

CMG Phase II Projects ............................................................................................................................................. 11

CaBA Projects .................................................................................................................................................................. 12

Water Quality .................................................................................................................................................................. 13

Potential Actions & Opportunities .................................................................................................................................. 14

Other Projects/ Opportunities ................................................................................................................................ 14

Blockers ................................................................................................................................................................... 14

Resources/ Stakeholders ......................................................................................................................................... 14

Action Plan: ..................................................................................................................................................................... 15

Flood Risk & Drought Evidence Checklist

Evidence Checklist

Who Comments Last updated

Community Matrix

CMG Host Ranked 15 out of 45 communities, with a score of 18. Troutbeck Bridge has flooded 6 times in the past 20 years (2004, 2005, 2006, 2008, 2009 & 2015). Interventions are in place, see existing projects. Number of properties flooded in 2015 is included with Windermere figures (215). 1 business was flooded in 2015 No properties are listed under the NaFRA hotspots as medium or high flood risk. WFD: Good (in 2016)

Feb 2019

Catchment area & Communities at risk (upstream or downstream)

CMG Host Catchment area: 26km2

Communities downstream include Windermere (Lake) and communities affected by the Lake level (e.g. Bowness) as well as Newby Bridge and Backbarrow.

Feb 2019

Surface Water Plan (2012)

CCC Not mentioned in the SwMP Feb 2019

Section 19 Report

CCC Flood Investigation Report: 7 properties were affected in December 2015, largely due to issues on Bell Beck, where gravel and stone mobilised from erosion in the open channel had washed downstream to reduce the capacity of the Bell Beck culvert. The areas in Troutbeck Bridge that are particularly prone to the effects of flooding are Brook Street, Calgarth View and Broadfield. Troutbeck Bridge was affected by flooding on two occasions through December 2015; on the 5th and 22nd. There are no formal flood defences within Troutbeck Bridge. There is a short length of raised ground upstream of Brook Street adjacent to the Bell Beck culvert inlet, as well as a flow interception trench in the field upstream of Brook Street on the left bank floodplain of Bell Beck. There was a contribution to flooding from surface water run-off from the high ground in the upper Bell Beck Catchment, which descends towards the A591 at Calgarth View. Published reports: FIR no.482. Troutbeck Bridge 5-6th December 2015. Bell Beck culvert exceedance and tonnes of gravel removed from culvert. Additional problems from surface water, ground water and sewer flooding. Investigations: A592 Chapel riding junction: surface water. A592 Windermere School: restriction in culvert.

Feb 2019.

Keldwyth drive: culverted watercourse has been diverted into highway drain without consent: Surface water issues east of Bell Beck.

Flood Risk Layers/ Models

EA See catchment maps Feb 2019

Modelling (e.g. NFM Models)

All Not available in this catchment Feb 2019

Making Space for Water Hotspots

CCC Hotspot 51: Bell Beck, Calgarth, Troutbeck Bridge. Combined flood mechanisms. Culvert improvements and overflow route needed. Hotspot 57: A592 above Sun Hill, Thickholme, Holehird estates. Highway flooding. Hotspot 05: de-culverting needed (SD40742 99557).

May 2019.

GIS Layers: e.g. Historic flood outline Risk of flooding (depth)

CMG Host See catchment maps

Wastewater flooding issues

UU Confidential information. Will be discussed at PWG (May 2019).

Maintenance EA The EA Operations Team inspect Bell Beck culvert inlet, particularly before and after bad weather, as ‘high priority’ site. This is in addition to routine inspections. EA Asset Maintenance Programme No information

Feb 2019

Other info Holehird Rain Gauge – records monthly rainfall totals. Windermere Blackmoss rain gauge – records daily.

Feb 2019

Local Knowledge

Community Reps/ Parish Councils

Troutbeck Bridge Flood Action Group NY40519 00143: the beck spills out of channel here during high flows.

May 2019

Existing Projects or Interventions for Flood Risk

EA FCRM Scheme? Yes/No

Project Lead Project Description Completion Date

South Cumbria Rivers Trust

Bell beck flows out of a large pipe under the A592 into a steep wooded valley. There is opportunity to enhance large woody debris, undertake tree planting and exclude stock.

2019 (on-going monitoring)

Cumbria County Council

Property Level Protection to properties – i.e. supporting wall. 2019

National Trust Removal of the embankment on the right-hand bank and installation of leaky woody structures to re-connect the beck with its floodplain. The floodplain will also be planted up as wet-woodland, and some surface scrapes added to increase surface roughness and 'slow the flow'.

Catchment Maps:

Working With Natural Processes Mapping (Environment Agency)

The following text is taken from the guidance associated with the map layers.

WWNP Wider Catchment Woodland Potential is our best estimate of locations where there are slowly permeable soils, where scrub and tree planting may be most effective to increase infiltration and hydrological losses. The dataset is designed to support signposting of areas not already wooded. The dataset is based upon the 1:50k BGS geology survey, and relies upon identifying drift and bedrock geologies that are characteristic of slowly permeable soils. A set of open access constraints data was used to erase areas which contained existing woodland, watercourses, peat, roads, rail and urban locations.

WWNP Floodplain Reconnection Potential is our best estimate of locations where it may be possible to establish reconnection between a watercourse and its natural floodplain, especially during high flows. The dataset is designed to support signposting of areas where there is currently poor connectivity such that flood waters are constrained to the channel and flood waves may therefore propagate downstream rapidly. The dataset is based upon the Risk of Flooding from Rivers and Sea probability maps, and identifies areas of low and very low probability that are close to a watercourse, but which do not contain residential property or key services. The areas may contain non-residential property so it is important to consider this and recent buildings or defences when considering floodplain reconnection. Locations identified may have more recent building or land use than available data indicates. It is important to note that land ownership and change to flood risk have not been considered, and it may be necessary to model the impacts of significant reconnection.

WWNP Floodplain Woodland Planting Potential is our best estimate of locations where tree planting on the floodplain may be possible, and effective to attenuate flooding. The dataset is designed to support signposting of areas of floodplain not already wooded. The dataset is based upon fluvial Flood Zone 2 of the Flood Map for Planning. A set of open access constraints data was used to erase areas which contained existing woodland, watercourses, peat, roads, rail and urban locations. The information provided is largely based on modelled data and open constraints data, and is therefore indicative rather than specific. Locations identified may have more recent building or land use than available data indicates. It is important to note that land ownership and change to flood risk have not been considered, and it may be necessary to model the impacts of significant planting. Runoff Attenuation Features Potential is our best estimate of locations of high flow accumulation across the land surface or in smaller channels, where it may be possible to temporarily store water and attenuate flooding during high flows. The dataset is designed to support signposting of areas where to target enhanced storage. It is based upon the Risk of Flooding from Surface Water datasets and identifies areas of high flow accumulations for the 1% Annual Exceedance Probability surface water maps. The areas of ponding or accumulation are between 100 and 5000 metres squared, and have been tagged where they fall on an area of slope steeper than 6% as gully blocking opportunities. All the potential areas have been constrained so that they are not in urban areas or on roads, rails or canals.

CMG Phase II Projects No. Project Name Project Lead Project Description Project Type Partners Additional

Benefits Cost Estimate

Funding Status

Landowner permissions

Timescale Comments/ Blockers

T1

Troutbeck NFM Augmenting A591 Works

Forestry Commission

The project will deliver 15 large woody debris structures to aid morphological river function and provide habitat niches.

Upstream Land Management

Environment Agency, South Cumbria Rivers Trust and Cumbria County Council

T2

Leaky Woody Structures at Poole Bank

South Cumbria Rivers Trust

Installation of leaky woody structures at Poole Bank Farm to hold water back during high flows.

Upstream Land Management

Habitat & Species

Requires funding to proceed

T3

Embankment Removal at Ings Lane

South Cumbria Rivers Trust

This project aims to remove a section of embankment from the right bank of Troutbeck, as well as the whole of the left-hand bank of the tributary which joins the beck here. Installation of leaky woody structures in the main beck will help to slow the flow and re-connect the beck with its floodplain. The area will also be planted with native woodland, with open areas and surface scrapes to help hold the water.

Upstream Land Management

National Trust, Natural England

Habitat & Species

Requires funding to proceed

T4

Peatland Restoration at Troutbeck

Cumbria Wildlife Trust

A large number of discrete patches were identified within the Cumbria Peat Mapping project with between low and medium restoration potential. This is part of Troutbeck SSSI which is in favourable condition. Additionally, tree planting options will be scoped.

Upstream Land Management

Woodland Trust

Habitat & Species

£10-50k Requires funding to proceed

CaBA Projects ID Project Name Lead

Organisation Description Status Duration Theme 1 Theme 2 Delivers

for NFM?

Cost Funding Source

Partners

Water Quality Waterbody: Troutbeck

Troutbeck is one of the main spawning grounds of the Leven catchment.

Potential Actions & Opportunities

Other Projects/ Opportunities

• Troutbeck is one of the main spawning grounds of the Windermere/ Leven catchment. Potential for integrated project.

• SD 40742 99557: de-culverting needed and potential NFM opportunities could be scoped (Cumbria County Council).

• SD40515 99744, crossroads. Culvert here has been tapped into highways drainage (Cumbria County Council).

• St Catherines – footprint building could offer potential opportunities.

• Holehird – management control through CCC, could look at getting woodlands into a management agreement. Look at Phase II on the Bell Beck project to add to the Leaky Woody Debris, options for further tree planting. SCRT to follow up. Could develop into a demonstration area and create links with the local school. Good support from the local flood action group.

• SCRT had submitted a project upstream of Holehird as part of the NFM programme. This was unsuccessful but there could be options to revisit this.

• Could be links with highways as projects could protect the A591 from flooding.

Blockers Action

Resources/ Stakeholders Limited resource to put further time to projects here but there is good local support and could be good PR.

Action Plan: Action Lead Partner Partners/ Resource Due Date/

Completed? Please date when completed

CCC & SCRT to scope NFM opportunities around Holehird

Cumbria County Council

SCRT – limited resource. 1-day scoping.

SCRT to continue to develop and monitor the NFM scheme on Bell Beck

South Cumbria Rivers Trust

SCRT Resource. Bell Beck NFM project, 1-2 days of resource for additional development