]> 2026-04-13T18:02:05+00:00 Case study:Papermill Weir Section in-channel restoration 500 en Papermill Weir In-channel Restoration (Tree Hinging and gravel) Case Study.pdf Draft Tree hinging and adding gravel. Environment Agency SKDC Wild Trout Trust and Grantham Angling Association Fly Fishing Section Great Britain Yes No Yes false PaperM1.jpg New Riffle.jpg No It has worked well to do this project in two phases, firstly with the addition of the wood and secondly with the gravel. Particularly where living willow has been used, it will allow the woody material to establish before trapping the gravel as it moves downstream over time. The use of natural wood found on site and the placement of gravel at a single point with good access have proved very cost effective compared to a constructed riffle approach. If safe to do so, gravel is best added in high flows to avoid the requirement for people in the channel to rake it flat. The high flows will naturally and quickly sort the gravel into position. The gravel used was 5 – 20mm size range; in future a 20 – 40mm component should also be included to match the naturally-occurring size range in the Upper Witham. 52.898698113878,-0.62671626571914 David Environment Agency Hutchinson Tree hinging and adding gravel.,, ,,, This is a routine EA fisheries survey site so we will be able to monitor the long term impact of the changes over the next few years. The movement of gravel features is being monitored and post high flow events winter 23/24 we are seeing near bar and riffle features forming in the wooded section. 27054 SKDC, Wild Trout Trust and Grantham Angling Association Fly Fishing Section, Hinged Trees following works PaperM2.jpg 2023-01-11Z 2459955.5 Complete This project was undertaken to improve river habitat in a section of the Upper Witham downstream of a large weir. Despite flowing through an area of woodland with good riparian wetland habitat and some sinuosity, the bed material was almost exclusively large cobbles. Very little gravel was available for trout spawning, as a result of the interruption of natural sediment transport processes by the weir. In addition, there was little woody material habitat in the river. The project to address this occurred in two phases. In 2022, the Blue Green Corridor project led by SKDC worked in conjunction with Grantham Angling Association (Fly Fishing Section) to hinge existing trees into the river to create berm features and also secured trunks that fully spanned the river. The latter aiming to create scour pools underneath. In 2023, the Wild Trout Trust completed the works by adding gravel onto the sill of the weir at the upstream extent of the reach. In subsequent high flow events, including Storm Babet, the gravel could then naturally start to move into position downstream. Papermill Weir Section in-channel restoration papermill weir section in-channel restoration No 350 Witham Anglian Upper Witham upper witham Papermill weir section papermill weir section 10 - 100 km² 46 Less than 100 m Upper Witham GB105030056760 Habitat and biodiversity 23400 10 - 50 k€ GB105030056780 Witham - confluence of Cringle Brook to confluence Brant 2024-02-08T14:07:39Z 2460349.0886458 2024-02-27T12:09:56Z 2460368.0068982 Papermill Weir Section in-channel restoration 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Papermill Weir Section in-channel restoration]] [[Subcatchment title::Upper Witham]] Papermill Weir Section in-channel restoration# QUERY86c5bd2f29eb1384518e957c9525e753