OTLEY FLOOD ALLEVIATION

SCHEME

PUBLIC DROP IN MATERIAL FOR 31ST JULY 2019 EVENT

Following feedback from residents the material for the Public Drop In event on 31st July 2019 is being

shared ahead of the event. We would like the opportunity to discuss this material with you in person, if

you have any questions we will be more than happy to answer these on the 31st July. Alternatively, you

can contact the project team at FRM@leeds.gov.uk (Please include ‘Otley FAS’ in the subject.

Contents:

• Scheme History and Update

• Flood Defence Site General Arrangement Drawing

• Landscape and Ecological Mitigation Plan

• Scheme Photomontages

• Programme of Works

• Feedback Sheet

Otley Flood Alleviation Scheme

HISTORY & BACKGROUND

Otley has a history of flooding dating back hundreds of years1, with notable events occurring in 1920,

1935, 1961, 1982 and most recently in 2015. On 26th December 2015, over 50 residential properties

were flooded. Most of the flooding was located on Farnley Lane and Bridge Avenue in the centre of

Otley and resulted from the River Wharfe overtopping its banks.

So, in the Autumn Statement 2016, the Government announced that £2 million would be available to

invest in a scheme to better protect homes and businesses from flooding.

Figure 1: Images of historic flood events in Otley

Preferred Option

The preferred option comprises of two parts; a flood embankment to the west of Billams Hill, running

from Otley Bridge to the gardens of Newall Mount, and management of the vegetation on the islands

downstream of Otley Weir. This will reduce the risk of flooding from the River Wharfe to properties

on Farnley Lane and Bridge Avenue to a 4% (1 in 25) chance in any given year.

The hydraulic modelling shows that the flood embankment has to be constructed together with the

vegetation management. This is because the vegetation management reduces river levels in high flow

events (sufficient to offset any impact of higher river levels as a result of the embankment) and the

embankment cuts off the primary flood route across Billams Hill. These two measures will work in

conjunction to reduce the flood risk on Farnley Lane and Bridge Avenue as well as not increasing the

flood risk elsewhere.

1 Strategic Flood Investigation Report (Section 19), Leeds City Council, 2017

Otley Flood Alleviation Scheme

Work undertaken since February 2019 drop-in event

In June, Leeds City Council executive board approved the Otley Flood Alleviation Scheme Outline

Business Case (OBC) to be formally submitted to the Environment Agency. Approval was also given to

submit the planning application for the scheme in summer 2019.

The River Wharfe modelling has been finalised and is now in the final approval process. It has shown

that the preferred option does not increase flood risk elsewhere.

Since the last drop in, a range of assessments have progressed. Assessments are a crucial part of the scheme’s development as findings help us to understand the impact of proposed and mitigation measures. Some of these include:

Next steps OBC approval is required in order to secure the necessary funds to progress to detailed design and construction. The next steps of the project schedule will be:

• Submission of the Planning Application and Outline Business Case: Summer 2019

• Outline Business Case decision: Winter 2019

• Planning Application decision: Winter 2019

• Detailed Design: Autumn 2019 - Spring 2020

Subject to obtaining the necessary approvals works are programmed to start on site in Summer 2020.

During this period, regular drop-in events will be held to keep the public and stakeholders informed.

Working slots If you would like further information on the Otley FAS, members of the team will be based in Otley

Town Council on Monday 19th August and Wednesday 16th October between 3pm-6pm.

Save the date Otley FAS engagement event: 11th September, 1pm-7pm, Otley Core Resource Centre.

Type of assessment Purpose Progress

Historic Environment Assessment To ensure the proposed scheme does not adversely impact structures with historical significance.

✓

Arboricultural Impact Assessment / Landscaping Design

To inform mitigation measures for existing trees. ✓

Ecological Impact Assessment To mitigate any adverse impacts to fauna. A water vole survey has also been undertaken on the Kell Beck.

✓

Highways Access Assessment To ensure all vehicles that currently access the site can do so after the scheme is constructed.

✓

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PROJECT NO:

70049382

70049382-WSP-EWE-OTLEY-DR-CE-201P01.09

OTLEY FLOOD ALLEVIATION SCHEME

FLOOD DEFENCE SITE

GENERAL ARRANGEMENT

AS SHOWN TJ PS

JB CAW FEB 19

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REPRODUCED BY PERMISSION OF ORDNANCE SURVEY OB

BEHALF OF HER MAJESTY'S STATIONERY OFFICE.

(c) CROWN COPYRIGHT AND DATABASE RIGHT 2018.

ALL RIGHTS RESERVED. LA100019567.

LEGEND

PROPOSED ROCK MATTRESS /

RIVER BED ARMOUR

PROPOSED FLOOD EMBANKMENT

PROPOSED EROSION PROTECTION

PROPOSED RETAINING WALL STRUCTURE

WATER COURSE

PROPOSED FENCE

PROPOSED LANDSCAPED SLOPE

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Scale - 1:250

PROPOSED RE-ALIGNMENT

OF KELL BECK

PROPOSED FLOOD EMBANKMENT

GRASSED SURFACE, CREST AT 54.15m

AOD. SIDE SLOPE 1 IN 3 (33%)

PROPOSED LOCATION FOR THE

KELL BECK TO DISCHARGE

INTO THE RIVER WHARFE

PROPOSED ACCESS TO

NORTHERN FIELD

EXISTING PUBLIC RIGHT

OF WAY TO BE DIVERTED

PROPOSED HIGHWAY ACCESS

RAMP. CREST AT 54.15m AOD.

GRADIENT 4% FOR THE FIRST 10m

AND THEN 5% UNTIL THE CREST

PROPOSED DIVERTED

PUBLIC RIGHT OF WAY

PROPOSED RE-ALIGNMENT

OF KELL BECK

PROPOSED GRASSED SLOPE

WITH A SLIGHT GRADIENT

(1 IN 35) SLOPING TOWARDS

BILLAMS HILL

PROPOSED FLOOD WALL

TO TIE INTO HIGH

GROUND

PROPOSED RAMP SLOPE DIRECTION

PROPOSED VEHICULAR ACCESS

PROPOSED PROW DIVERSION

PROPOSED PRIVATE PEDESTRIAN

ACCESS PATH

PUBLIC RIGHT OF WAYPROW

wsp.com

1st Floor Station House, Exchange Station, Tithebarn Street,

Liverpool, L2 2QP

TEL; +44(0) 0151 331 8100

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PROPOSED MAINTENANCE ACCESS TRACK

PROPOSED 5m WIDE

GRASSED STRIP FOR

MAINTENANCE ACCESS

END OF SHEET PILING (TBC AT

DETAILED DESIGN)

PROPOSED 5m WIDE

GRASSED STRIP FOR

MAINTENANCE ACCESS

EXISTING BILLAMS HILL

WALL TO REMAIN AS

EXISTING

EXISTING BILLAMS HILL WALL /

OTLEY BRIDGE PARAPET TO

REMAIN AS EXISTING

PROPOSED AREA RESERVED

FOR ACCESS TRACK TO

SERVE NORTHERN FIELD

53.47

54.15

54.15

54.15

53.34

52.75

SE 2045

OSMAP REFERENCE

54.15

53.47

PROPOSED OUTFALL

HEAD WALL WITH

STONE CLADDING

53.26

52.58

2 No. PROPOSED HIGHWAY

GULLIES

EXISTING SECTION OF BILLAMS

HILL WALL TO BE REMOVED,

APPROXIMATELY 5 METERS LONG

EXISTING MASONRY WALL TO BE

REMOVED AND REPLACED WITH

BOUNDARY FENCE.

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PROPOSED LANDSCAPING

TO BE AGREED WITH

PROPERTY OWNERS

PROPOSED LANDSCAPING IN NEWALL

MOUNT PROPERTY GARDENS

PROPOSED PEDESTRIAN HANDRAILING

BETWEEN FOOTPATH AND VEHICULAR

ACCESS

PROPOSED DITCH

CROSSING

EXISTING WALL TO BE

RAISED IN PLACES

PROPOSED NEW KERB LINE

WITH DROPPED KERBS AND

TACTILE PAVING

PROPOSED NEW KERB LINE

WITH DROPPED KERBS AND

TACTILE PAVING

PROPOSED

CULVERT OUTLET

PROPOSED

CULVERT

PROPOSED CULVERT

INLET

1. ALL DIMENSIONS ARE IN MILLIMETRES AND LEVELS ARE IN

METRES RELATED TO ORDNANCE DATUM UNLESS STATED

OTHERWISE.

BLACK METAL FENCE / SAFETY

RAILING FENCE DETAILS TO BE

AGREED WITH HISTORIC ENGLAND

PROPOSED PEDESTRIAN HANDRAILING

EXISTING TARMAC ACCESS TO OTLEY

SAILING CLUB

PROPOSED SHEET PILLING

EXISTING TARMAC ACCESS TO

OTLEY SAILING CLUB TO BE

RETAINED.

Native tree planting on islands to

compensate for tree management,

improve habitat and provide bat

foraging habitat. E.g. weeping

willow, alder, white willow.

Carry out the removal of 50% of

deadwood across all islands and

anchoring of remaining 50% of

deadwood to the ground or trees

Carry out selective removal of trees

(un-healthy and fallen trees) with retention

of the root bulbs across all the islands

Selective management of healthy

trees, including pollarding and

crown lifting across all islands

Thin 30% of the Crack

Willow across all islands

Retain large crowns of

healthy mature trees

Remove 100% of collapsed stems

Retain channel shading creating marginal

habitat around the islands for fish habitat

0m 10m 20m 30m5m 15m

Existing trees retained and protected

during management works

Existing trees removed to ground level

and root structure left in place

Existing scrub vegetation removed

Proposed Heavy Standard native tree planting

to replace crack willow such as alder, white

willow, weeping willow & downy birch

(maintained as single stem species)

Pre-vegetated coir pallets with wetland planting to

prevent erosion. Salix standard plant mix or

similar

Proposed wetland planting / wetland seeding

with Germinal River flood plain mix RE3

Existing group of trees to be retained and

protected

KEY:

Existing group of trees to receive tree

management works as detailed in the notes

below

Tree root protection area of existing

trees

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PROJECT NO:

70049382

70049382-L-04 C

OTLEY FAS

Landscape and Ecological

Mitigation Plan

Leeds City Council

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1:250 BV MP

BV CM July 19

1st Floor Station House, Exchange Station,

NOTES:

Vegetation Management to be carried out across the island to include the phased

replacement of 50% of tree and scrub vegetation and removal of non-native invasive

species

· Crack willow to be selectively thinned and replaced with single stemmed species. Tree management works carried

out to retained trees to include removal of deadwood and crown lift / pollarding. Carry out selective removal of

deadwood across all islands, whilst anchoring any retained deadwood.Trees / scrub to be taken down to ground

level with root bulbs retained for island stability.

· Invasive species to be treated in-situ as part of an on-going invasive control programme. Any herbicide application

to be carried out by EA approved contractors to avoid contamination.

· Native wetland planting mix to be planted in gaps where vegetation has been removed

· West of island sown with a wetland seed mix such as Germinal River floodplain / Water Meadow mix RE3

· Bat and bird boxes to be installed on retained trees and pollarding to retain suitable features for nesting and

roosting where possible.

· 50% of vegetation retained to continue to offer cover and foraging for bats, birds and commuting otter, with at least

30% cover of overhanging boughs along the island margins.

* Note: Individual tree locations within groups on

island are approximate and trees for removal to be

tagged and agreed on site with arboricultural

consultant prior to work being carried out

Please refer to Arboricultural report for full details of

proposed tree management works and methodology.

• Lycopus europaeus (Gypsywort)

• Lysimachia vulgaris (Yellow Loosestrife)

• Lythrum salicaria (Purple Loosestrife)

• Myosotis scorpioides (Water Forget Me Not)

• Mentha aquatica (Water Mint)

• Phalaris arundinacea (Reed Canary Grass)

• Ranunculus flammula (Lesser Spearwort)

• Schoenoplectus lacustris (Common Club Rush)

• Valeriana officinalis (Common Valerian)

Salix Pre-Vegetated Coir Pallets - Standard Plant Mix

typically contains a mixture of plant species

from the list below

• Apium nodiflorum (Fools Watercress)

• Alisma plantago-aquatica (Water Plantain)

• Carex acutiformis (Lesser Pond Sedge)

• Carex flacca (Blue Sedge)

• Caltha palustris (Marsh Marigold)

• Glyceria maxima (Sweet Reed Grass)

• Iris pseudacorus (Yellow Flag Iris)

• Filipendula ulmaria (Meadowsweet)

• Juncus effusus (Soft Rush)

Germinal RE3 (River Floodplain / Water Meadow - MG8 Grassland)

Mixture Breakdown

0.3% AUTUMN HAWKBIT (Leontodon Autumnalis)

2.0% COMMON KNAPWEED (Centaurea nigra)

0.1% COMMON MOUSE-EAR (Cerastium fontanum)

0.5% COMMON SORREL(Rumex acetosa)

2.5% CREEPING BENT (Agrostis stolonifera)

2.0% CREEPNG BUTTERCUP(Ranunculus repens)

20.0%CRESTED DOGSTAIL (Cynosurus Cristatus)

0.2% MARSH MARIGOLD (Caltha palustrus)

3.0% MEADOW BUTTERCUP (Ranunculus acris)

10.0%MEADOW FESCUE (Festuca pratensis)

1.0% MEADOW SWEET (Filipendula ulmaria)

1.6% OXEYE DAISY (Leucanthemum vulgare)

0.3% RAGGED ROBIN (Lychnis flos cuculi)

1.0% RED CLOVER (Trifolium pratense)

3.0% RIBWORT PLANTAIN (Plantago lanceolata)

0.2% ROUGH HAWKSBIT (Leontodon hispidus)

10.0%ROUGH STALKED MEADOW GRASS (Poa trivialis)

2.0% SELF HEAL (Prunella vulgaris)

25.0%SLENDER CREEPING RED FESCUE (Festuca rubra litoralis)

2.5% SWEET VERNAL GRASS (Anthoxanthum odoratum)

5.0% TENO (Phleum bertolonii)

2.0% WHITE CLOVER (Trifolium repens)

0.8% YELLOW RATTLE (Rhinanthus minor)

5.0% YORKSHIRE FOG (Holcus lanatus)

N

INDICATIVE WETLAND SPECIES MIXES

Before: Picture of the Islands downstream

of Otley Weir from Wharfemeadows Park.

After: Illustrative Photomontage of the

Islands downstream of Otley Weir.

Vegetation management works on the

islands downstream of Otley Weir, this

includes some removal of trees, woody

debris and shrubs. Refer to Landscape

and Ecological Mitigation Drawing.

Island Vegetation Works Downstream of Otley Weir

Otley Flood Alleviation Scheme

Flood Defence Works to the West of Billams Hill

Before: Picture of the Old Cattle Market Site from Otley Bridge

After: Illustrative Photomontage of the Flood Defence and Access Ramp

Otley Flood Alleviation Scheme

Survey,

Feasibility, &

Modelling

Flood Defences Operational

Options

Appraisal

July 2016

Outline Design

of Preferred

OptionSummer 2019

Planning

Permission &

Formal

Consultation

Period

Spring 2020Detailed Design

Autumn 2020

Early Spring 2019

Main

Construction

Contract

Otley FAS event feedback sheet

Name …………………………………………………………………………………………. Address ………………………………………………………………………………………. Contact email / phone ……………………………………………………………………….. (Your data will not be shared with third parties and will remain confidential, it will only be used for the purposes of the Otley FAS by the project team)

Please add me to the project mailing list to receive the quarterly community update

Have you found this event useful?

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Is there any further information, suggestions, or comments which you would like to note here

which can be used by the team to input into the project?

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Thank you for your time.