]> 2026-04-12T07:35:51+00:00 Case study:Narborough Rehabilitation Project 500 en NAR Spring 2011 - as built project report.pdf River Nar Rehabilitation summary by Nigel Holmes Approved Environment Agency River Restoration Centre Natural England Great Britain No No Yes false No 52.68766,0.57811 Nigel T.H. Holmes ,, ,,, 5605 Environment Agency, Natural England, River Restoration Centre just post works Nar.png Complete River excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’. Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout. Work carried out: **created greater diversity of habitat by modifying both the long and cross-sections; **locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream; **removed the unsightly deflectors by replacing them with ‘living’ features that already are doing a much more effective job than the deflectors were attempting to do; **the one main difference from the Castle Acre stretch was that some of the upstream ‘runs’ had a thin layer of gravel spread over them too. Differences in character were primarily determined by the character of the river bed where pools were excavated, and the extent of reed/sedge available from adjacent to the river to add to the channel. Where the bed was hard, and reed/sedge was plentiful, upstream narrowing could be more extensive. In all cases where the bed was hard (predominantly chalky clay), very distinct pools and upstream ‘runs’ were formed. Where-ever possible the bed of the narrowed channel upstream of the pools was shallowed by adding material dug from the pools – this could only be done where flints or firm clay formed the substrate. Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term. Narborough Rehabilitation Project narborough rehabilitation project No North West Norfolk Anglian Nar to confl with Blackborough Drain nar to confl with blackborough drain Narborough narborough 100 - 1000 km² 95 Less than 100 m Nar to confl with Blackborough Drain GB105033047791 Habitat and biodiversity Hydromorphology Peat GB105033047791 Nar to confl with Blackborough Drain 2013-04-09T11:13:41Z 2456391.9678357 2025-03-13T16:47:57Z 2460748.1999653 Narborough Rehabilitation Project 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Narborough Rehabilitation Project]] [[Subcatchment title::Nar to confl with Blackborough Drain]] Narborough Rehabilitation Project# QUERY2a876c06626cd90e35ef85084a98c48f