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 [email protected] (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.
✓
A
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REV DATE BY DESCRIPTION CHK APP
S01 25/07/2019 CAW FOR COORDINATION JB PS
S0 - WORK IN PROGRESS
APPROVED:
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WSP UK Ltd
c
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
DO NOT SCALE
NOTES
00 12.5
SCALE 1:250
m25
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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PLAN
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
F
L
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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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5
%
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
BV
BV
BV
S0 - WORK IN PROGRESS
wsp.com
Tithebarn Street, Liverpool, L2 2QP, UK
T+ 44 (0) 151 600 5500
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SITE/PROJECT:
DESIGNED:
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DRAWN:
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PROJECT NO:
70049382
70049382-L-04 C
OTLEY FAS
Landscape and Ecological
Mitigation Plan
Leeds City Council
BV
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.