Case study:Little Ponton

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Location: 53° 9' 7.49" N, 0° 38' 10.62" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Matt
Main contact surname	Parr
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Grantham Angling Association Fly Fishing Section
Parent multi-site project	Upper Witham Restoration
This is a parent project encompassing the following projects	No

Brushwood mattress in restoration section

Project summary

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Project Objectives

• To reduce fine sediment inputs caused by bank erosion. • Trap mobile fine sediments already in the river. • To improve conveyance during higher flows and reduce flood risk. • To improve in-stream habitats and the bed structure to benefit fish and invertebrates, including white-clawed crayfish.

The Enhancement Scheme The enhancement scheme was completed in two phases. A short section downstream of Great Ponton Mill was completed in February 2013 and the second, the continuation downstream to Whalebone Lane, Little Ponton, was completed in mid-August 2014. Prior to the enhancement work the in-river habitat was in generally good condition, however opportunities were identified to provide additional cover and food supply for a range of aquatic organisms together with measures to modify the flow to improve the structure of the riverbed and reduce the deposition of fine sediment.

The works consisted of brushwood mattress installation, Hinged Trees, Log Flow Deflectors and Vanes, improved stock fencing and ford refurbishment were all undertaken.

Monitoring surveys and results

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A fixed point photographic record has been set up and this, together with visual inspections, will be used to monitor the integrity and performance of the in-stream structures. A programme of fine sediment sampling and Wolman Pebble Counts to monitor the coarser riverbed material has also been established. In combination they will determine and record changes to river morphology as the result of the works. The established crayfish monitoring site at the bottom of the reach is already surveyed every 2 years and this will give an indication of the impact of the scheme on crayfish numbers. Finally additional ongoing invertebrate sampling will identify any ecological and water quality changes that occur.

Lessons learnt

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Learning lessons from the earlier GAAFFS work, willow logs were was not used in the subsequent phase of enhancement work. Instead logs, branches and brushwood generated by the management of other riverside tree and shrub species were used to create a variety of structures to protect vulnerable banks from erosion, narrow the channel and trap suspended fine sediment.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category 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 Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information