]> 2026-04-13T05:17:41+00:00 Case study:Hogsmill Sewage Treatment Works phase 1 500 en Approved Bank reprofiling Creation of backwater Wandle Trust Natural England Epsom & Ewell Borough Council Great Britain Thames Water No No Yes false No Spring 2013:<br>A number of large log deflectors that were placed there to attempt to improve flow and scour are currently ineffective due to the over wide channel. The Hogsmill STW phase 2 project will build on this previous work undertaken by Thames Water.<br><br>Good population of large fish, probably chub (approx 40-60cm)<br>Parts of the Hogsmill River support extensive aquatic vegetation and some London rarities such as small pondweed Potamogeton berchtoldii.The upper reaches have a diverse invertebrate community including some species characteristic of chalk streams. Caddisflies and mayflies have been found, as well as the more pollution tolerant beetles, freshwater shrimps and freshwater limpets. 51.401161193848,-0.28780049085617 Toby Wandle Trust Hull Bank reprofiling,Creation of wetland,Creation of backwater ,,, Photographs pre-works 12669 Natural England, Epsom & Ewell Borough Council, Hogsmill River Before works Hogsmill1.png 2011-01-01Z 2455562.5 Complete Enhance a section of the Hogsmill through the STW by creating marginal and wetland area berms, backwaters and scrapes. This is within a wider wildlife area within the STW, encompassing wildflower grassland, tree planting and visitor interpretation trail and enhancement works to Surbiton Lagoon. Section 106 development gain from planning permission. Original scheme no longer valid so work proposed to the Hogsmill to enhance the channel edge habitat. Hogsmill Sewage Treatment Works phase 1 hogsmill sewage treatment works phase 1 No 330 London Thames Creation of wetland Hogsmill hogsmill 10 - 100 km² 192 100 - 200 m Hogsmill GB106039017440 Economic aspects Flood risk management Habitat and biodiversity Social benefits GB106039017440 Hogsmill 2011-01-01Z 2455562.5 2014-04-03T08:36:34Z 2456750.8587269 2017-06-06T14:50:20Z 2457911.118287 Hogsmill Sewage Treatment Works phase 1 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Hogsmill Sewage Treatment Works phase 1]] [[Subcatchment title::Hogsmill]] Hogsmill Sewage Treatment Works phase 1# QUERY204fe0388047824b13bedfd11f154b3a