storm frank floods, impacts upon the river dee, aberdeenshire - jamie urquhart, river dee trust
TRANSCRIPT
Storm Frank FloodsImpacts upon the River Dee, Aberdeenshire
Jamie Urquhart River Dee Trust Biologist
Background• River Dee finally burst its banks on 30th
Dec 2015.
• 1 in 500 year event.
• River levels reached 15ft 6in at its peak.
• 6in off largest spate event recorded in 1829.
• 1,300 cumecs estimated flow at peak.
Video Credit: Ewan Brown YouTube
Impacts - Habitat• Significant changes to parts of the River,
new channels/braids formed/banks burst.
• Erosion and deposition of substrate.
• Channel still very mobile, with areas yet to be surveyed.
• Has habitat heterogeneity increased or decreased?
• Sections of habitat surveys from 2013-15 will be repeated in 2016 to compare.
BeforeAfter
Impacts - Fauna• Fish and invertebrates
stranded/displaced/crushed.
• Won’t fully understand impacts until summer surveys.
• Positives; Increased survival – density dependence.
• Fish rescued just last week - illustrates their resilience.
• Prospects for 2016-17 ample good quality habitat available for juveniles and adults.
Impacts - Infrastructure• Severe constraints on access across
catchment.
• Local communities.
• Beat access tracks, huts (50% lost).
• Considerable economic impact to local businesses.
• Despite all this the River is open for business.
• Message from the Riverbank is that the Ghillies and anglers are positive and eager to start fishing.
Before DuringAfter
Restoration• Emergency works instream – SEPA
consented.
• RDT infrastructure – Largely unscathed UDRS, Fish Passes (1 of 27 damaged).
• Riverbank Clean Ups - 100 vols over 3days 4 km cleared, 30 tonnes of debris removed.
• Early days restoration work will continue for several months.
• Challenging times but attitude from across the catchment is upbeat.