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River Restoration (Eddleston Water (Log Flow restrictors (prevent river…
River Restoration
Eddleston Water
Log Flow restrictors
prevent river flowing past at high flow
allows low flow through only
cause local ponding of high Q
slows water mvmt through catchment
Treeplanting on banks/ floodplain margin
encourage water take-up / infiltration
reduce runoff/floodrisk downstream
Remeander channel
improve habitat for salmanoids (pools/riffles/glides)
through replanting & plantation
Flow deflectors
creates artificial pools/riffles where remeandering not possible
Plant broadleafs on floodplain
increase roughness & flatten flood hydrograph
introduce large woody debris
increase roughness
Reduce stocking density
reduce trampling of ground
less compaction this greater infiltration
Catchment
Assessment
Intensive stream gauging
Water quality surveys
Geological/ geomorphological/ soil/ landcover surveys
Consideration of fisheries
Hydrological modelling
Consultation with landowners & public
Aims
Increase interaction of river & floodplain
Deal with/move away from engineered river solutions
Slow flow of rivers to prevent peaky response (SUDS integration)
Create rich & diverse wildlife habitats
Cooperate/encourage agriculture
River Ogwen,
N. Wales
Pools & Riffles
Encourage flooding
Point bars
Removal of banks / bank heaps
= restored in places
River Skerne, Darlington
Meander restoration
Encourage controlled flooding
to slow water & protect houses by diversion
Deflectors
slow water down (increase manning's roughness)
urban parkwater
Backwaters installed
temporary storage
Room for river
Holland programme
Deals with higher h20 levels
Provide river with more room to manage higher water levels
Improves quality of immediate surroundings all the while
Eddleston Water Project
Flows S into Tweed in Peebles
Catchment wide project to reduce flooding in sensitive areas
Increasing infiltration
tree planting /wetlands / log barriers
Restore river in places
slow water down
encourage flooding
improve wildlife habitats
Restore rivers to more natural state:
Many river have been artificially straightened/deepened/hiden/ higher levees
Natural Flood Prevention