Rural Sustainable Drainage Systems (RSuDS) are generally low technology, low cost solutions – as simple as a hole in the ground – that can capture, slow and improve the quality of run-off from fields and roads.
RSuDS can reduce surface water flooding, recharge groundwater and provide valuable wetland habitats. Many are already in place in the catchment but more widespread adoption is sought to improve the effectiveness of existing buffer strips at improving water quality given increasing frequency and intensity of extreme rainfall events. Several RSuDS projects have been run under the umbrella of the Broadland Catchment Partnership.
Slow the Flow (2015 – 2016)
The Slow the Flow project 2015/16 constructed eight RSuDS across the catchment using £31K from Defra’s Catchment Partnership Action Fund (CPAF). These will act as demonstration sites and over one hundred farmers have already visited some of the schemes.
Grants to landowners were promoted by the NFU, CLA, and Agri-tech East. Numerous site visits, liaison between farmers, landowners, and partners including Essex & Suffolk Water, Natural England and Norfolk Wildlife Trust in spring and summer 2015 saw all funds allocated. Work commenced in October 2015. The final schemes were completed in March 2016 using independent contractors and/or the Broads and Norfolk Rivers Internal Drainage Board.
Norfolk Rural SuDS (2016 – 2017)
The Norfolk Rural SuDS project constructed three sediment traps on the Salle Estate in 2016. The schemes were designed by the Norfolk Rivers Internal Drainage Board, constructed by Aylsham Plant Hire, and joint funded using £15K from Environment Agency and contributions from the WaterLIFE WWF UK Coca-Cola Freshwater Partnership Water Sensitive Farming project 2016-2018; and the Salle Estate. The schemes intercept water run-off from local roads and a sugar beet pad that previously flooded a section of road and ran directly into the Blackwater Drain. The Blackwater Drain flows into the River Wensum and ultimately through part of the Broads National Park Executive Area. These waterbodies are protected for their rare and diverse wildlife and they also provide drinking water to local communities.
The silt traps receive and slow down a large volume of water which allows sediment and suspended solids to settle out and clearer water to discharge to the drain. The solids can have pollutants attached to them and can also smother gravels that are an important habitat for river flies and fish such as brown trout. The traps can be maintained by using a digger to remove the solids that accumulate. The University of East Anglia is monitoring the effect of these schemes on water quality until 2019 as part of the Defra Demonstration Test Catchments programme. The schemes are being used as a demonstration site and local farmers have been taken to visit these during a knowledge exchange event in order to encourage greater subsequent uptake by farmers, land managers and highways engineers.
Broadland Run-off Reduction (2017 – 2018)
Norfolk FWAG are collaborating with the Environment Agency on the Broadland Run-off Reduction Project where funding can be up to 100%. The aim of this project is to reduce the impact of diffuse pollution that arises from rural land use and reduce nutrients going into the river. The benefits to the farmer are that the soil will be captured and can be put to beneficial re-use. A large scheme has been designed and constructed by the Norfolk Rivers Internal Drainage Board at Swannington in the Wensum catchment as part of the project.