]> 2026-04-09T06:45:18+00:00 Case study:Pymmes Park Wetlands 500 en Approved Deculverting Ponds and pools inside the wetland London Borough of Enfield Friends of Pymmes Park Thames21 Great Britain Yes No Yes true PP Construction.JPG PP Construction 2.JPG PP Before Planting.JPG PP Planting Event.JPG PP Planting.JPG PP Lake cell.jpg PP Planted wetlands.JPG PP Looking north.JPG No 51.618160104835,-0.071022748979885 Ian London Borough of Enfield Russell Reduced pollution Deculverting, Ponds and pools inside the wetland,Reedbed creation, Creation of wetland, Deculverting, Extensive planting, Sustainable urban drainage ponds (SUDs), Floodplain creation,, ,Reduced pollution,,Community involvement, Community Education, Public amenity and perception,, London Borough of Enfield has compiled pollution records and water quality data from the past, and has been collecting water quality data on Biological Oxygen Demand, Suspended Soilds and Nutrients for three years. A Water Quality monitoring programme is now in place with Thames21, measuring parameters such as: - Dissolved Oxygen and Biological Oxygen Demand -Nutrients (nitrates, phosphates and ammonia) - Faecal Coliforms 22133 London Borough of Enfield, Friends of Pymmes Park, Thames21, 2012-08-06Z 2456145.5 Complete The Moore Brook, is a lost river, which drains a catchment area of roughly 350 hectares and flows from Winchmore Hill to Edmonton (Pymmes Park Lake) passing through Firs Farm Recreation Ground. As it drains a large catchment, the Moore Brook picks up a large amount of urban runoff contaminated with phosphates, nitrates, heavy metals, hydrocarbons and oils from footpaths and roads. It has been culverted since the 1950’s, and as a result has been prone to plumbing misconnections. This pollution accumulates throughout the catchment causing problems further downstream when it enters Pymmes Park Lake, and is particularly prominent during periods of dry weather. The London Borough of Enfield highlighted that the ongoing complaints from the smell and pollution of the lake required a holistic approach in managing. This lake directly outfalls into Pymmes Brook, one of the most polluted tributaries of the River Lea. The London Borough of Enfield and Thames Water took on large scale project to resolve possible misconnections in the catchment. 800 misconnections were resolved, but to manage residual pollution from road runoff and additional misconnections a series of cascading wetland cells to capture dry weather flows, immobilise and filter pollutants from the stream before it entered the lake were introduced. A total catchment of 294Ha is treated by the four cascading wetland cells. 216Ha of this catchment passes through the Firs Farm Wetlands, which introduces a “first treatment phases” upstream of the Lake. A total of 0.6Ha of wetlands has been constructed across the Moore Brook Catchment, in Pymmes Park and Firs Farm. As a result, Pymmes Park Wetlands filters around 85% of all dry weather flows entering the lake. Pymmes Park Wetlands pymmes park wetlands No London Thames Reedbed creation Creation of wetland Deculverting Extensive planting Sustainable urban drainage ponds (SUDs) Floodplain creation Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B) pymmes brook (salmons brook to lee, includes part of lee navigation b) Pymmes Park Wetlands pymmes park wetlands Community involvement Community Education Public amenity and perception 10 - 100 km² 26 Less than 100 m Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B) GB106038027910 Environmental flows and water resources Flood risk management Habitat and biodiversity Monitoring Social benefits Water quality Urban UKGB106038027910 Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B) 2016-02-12T13:15:36Z 2457431.0525 2019-01-03T11:41:00Z 2458486.9868056 Pymmes Park Wetlands 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Pymmes Park Wetlands]] [[Subcatchment title::Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B)]] Pymmes Park Wetlands# QUERYeb090e0a7aa2f0135d193dec90eb218c