Case study:Forest Halt, Saltburn Valley Gardens

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Location: 54° 34' 45", -0° 58' 13"
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Project overview

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Status Complete
Project web site
Themes Economic aspects, Flood risk management, Social benefits
Country England
Main contact forename Peter
Main contact surname Batty
Main contact user ID
Contact organisation RAB Consultants
Contact organisation web site http://www.rabconsultants.co.uk/
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Project picture

Project summary

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The initial scope of the project was to assess the overall structural and hydromorphological condition of the watercourse running through Saltburn Valley Gardens to identify areas on potential improvement.

Three areas were identified as requiring intervention within the gardens where the part of the watercourse was beginning to effect infrastructure, namely the miniature railway line and the public car park or deposition is severely reducing the capacity of the channel. Given the lack of infrastructure surrounding the remainder of the watercourse this will be left to its natural processes. The first of the areas is located at the downstream end of the watercourse, at the confluence of Skelton Beck, Millholme Beck and the sea. At this location rapid erosion is taking place of the right-hand bank due to frequent inundation and the diversion of flows caused by silt deposition upstream, the second area of interest. The third area of interest and focus of this entry, is an area at the upstream end of the gardens adjacent to the final platform of the Saltburn Miniature Railway. This rapid response watercourse was regularly inundating the miniature railway and washing away both river bank and the sub base the tracks are laid on. The erosion was taking place on the outside of a sharp bend in the watercourse and various methods had pervious been tried to halt the erosion. All of these has subsequently failed leaving an area of bare earth with embedded pieces of gabion basket and other failed erosion protection measures.

A feasibility study was then undertaken considering the following options:

Do nothing

Use of local tree root balls to be imbedded in the bank with willow revetment

Use of vegetated bags with large stone revetment

Inclined gabion stone baskets.

Sheet piles with coir matting, willow faggots and rock rolls

A matrix scoring each option against environmental, economic and technical criteria was created and option 5 was selected offering erosion protection, flood protection and environmental benefits.

Detailed design, specification, construction drawings, method statement and environmental risk assessment were produced to allow the flood risk activity permit to be granted and the contractor to undertake the work. The works were undertaken in line with the methods statement approved by the Environment Agency which included a number of silt curtains and use of biodiesel.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Forest Halt
Flood defence 6 S8B84578.jpg
WP 20190131 11 05 415 Pro.jpg
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20170621 113005.jpg
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Catchment and subcatchment

Catchment

River basin district Northumbria
River basin Tees

Subcatchment

River name Skelton Beck Catch (Saltburn) trib of North Sea
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 328
328 m
0.328 km
32,800 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB103025071970



Site

Name Forest Halt, Saltburn Valley Gardens
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 50
50 m
0.05 km
5,000 cm
Project started 2017/10/11
Works started 2018/07/17
Works completed 2018/08/28
Project completed 2018/09/04
Total cost category more than 10000 k€
Total cost (k€)
Benefit to cost ratio
Funding sources

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 5000 - 10000 k€
Stakeholder engagement and communication 500 - 1000 k€
Works and works supervision more than 10000 k€
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project Improving local park and protecting infrastructure


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



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Supplementary Information

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