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Example of a low-level bund
A large, low level bund is being built in the floodplain at Newtondale to create additional flood storage capacity (120,000 cubic metres). This will only operate during flood events and by storing water, help to lower the flood peak downstream. Care was taken in it’s design and management to ensure that neighbouring properties, transport links and archaeology will not be adversely affected.
Newly planted riparian woodland
Riparian and floodplain woodland can form a barrier to flood flows, helping to slow the passage of the flood peak and potentially increase upstream flood storage. To date, 19 ha of riparian woodland have been planted within the Pickering Beck catchment and a further 10 ha within the River Seven catchment.
A typical large woody debris dam in a semi-natural woodland stream
Large woody debris (LWD) dams are a common feature in natural woodland streams but have been actively removed from most river systems in the UK due to concerns that they reduce fish movement and can be washed downstream, blocking bridges and culverts. However, these risks are increasingly thought to be outweighed by the ability of the dams to increase flood storage by raising water levels and reconnecting streams with their floodplain. The risk of washout can be reduced by limiting their formation to smaller watercourses (<5 m wide). A total of 129 LWD dams have been installed within the Pickering Beck catchment and a further 38 in the River Seven catchment.
Farm soil plans identify land at risk of generating rapid runoff and plan appropriate measures
Woodland can help to protect sensitive soils from disturbance and reduce rapid runoff due to high infiltration rates. Opportunities exist in both catchments for small-scale, targeted planting to help intercept surface runoff from fields and slow down its passage to streams. 15 ha of farm woodland have been planted to date, all within the River Seven catchment.
Roof, yard and related works to reduce site runoff have also been undertaken on 10 farms between both catchments, as part of Catchment Sensitive Farming.
Drain blocking can help to re-wet peats and slow down runoff
187 heather bale check dams have been constructed within moorland drains and gullies in the Pickering Beck catchment to improve water retention and delay the generation of flood flows. In addition, 3.2 ha of heather habitat have been reseeded and 800m of eroding footpaths repaired.
Heather burning has the potential to speed-up runoff by temporarily removing the vegetation cover and promoting hydrophobic soil conditions. 10m wide no-burn buffer zones have been established along all main watercourses in the upper catchment of Pickering Beck as part of a 10 year Environmental Stewardship Scheme.
Redesigning forest drainage systems to restore streamside buffer zones can help to slow down runoff
When Cropton Forest was originally planted in the 1960’s, forest drains were dug to improve soil conditions for tree growth. Drains led straight into streams and potentially increased the speed of runoff and the risk of erosion and siltation. As the forest is approaching harvesting age, there is an opportunity to correct these problems by redesigning the drainage systems and restoring streamside buffer zones. To date, 5.9 ha of riparian buffer have been restored, 3.3 ha (1,470m of streamside) in the Pickering Beck catchment and 2.6 ha (1,309m of streamside) in the River Seven catchment.
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