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BERVIE WATER – PROPOSALS FOR A CATCHMENT SCALE STUDY

BERVIE WATER – PROPOSALS FOR A CATCHMENT SCALE STUDY. Esk rivers & fisheries trust. catchment OBJECTIVES. Biological assessment Hydrological assessment Geomorphological assessment. INVERTEBRATE IDENTIFCATION. KICK SAMPLING. FISH MEASURED. ELECTRIC FISHING. BIOLOGICAL ANALYSIS.

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BERVIE WATER – PROPOSALS FOR A CATCHMENT SCALE STUDY

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  1. BERVIE WATER – PROPOSALS FOR A CATCHMENT SCALE STUDY Esk rivers & fisheries trust

  2. catchment OBJECTIVES • Biological assessment • Hydrological assessment • Geomorphological assessment

  3. INVERTEBRATE IDENTIFCATION KICK SAMPLING FISH MEASURED ELECTRIC FISHING

  4. BIOLOGICAL ANALYSIS • COMMUNITIES OF INVERTEBRATES HIGHLIGHT THE ON-GOING RIVER FUNCTIONS • DETECTS IMPACTS and ECOLOGICAL STATUS • Pollution, acidification, eutrophication, and metals • Score the invertebrates according to presumed sensitivity Biological Monitoring Working Party (BMWP) – based on families Ephemeridae (May Flies), Perlidae (Stone flies) – score 10 Caenidae (angler’s curse) – score 7 Gammridae (shrimps) - score 6 Baetidae (olives) - score 4 Hirudidae (leeches) - score 3 Chironomidae (midge larva) – score 2 Oligochaeta (worms) - score 1 Proportion Silt Sediment Sensitive Invertebrates – alternative to quantifying the volume of deposited fine sediment (<2mm) in the river bed

  5. PROPORTION SEDIMENT SENSITIVE INVERTEBRATES (PSI) PSI = ∑Scores for sediment sensitive groups (Highly& Moderate)/ ∑Scores for all sediment sensitive groups PSI River Bed condition 100-81 Minimally sedimented/unsedimented 80-61 Slightly sedimented 60-41 Moderately sedimented 40-21 Sedimented 20-0 Heavily sedimented

  6. HYDROLOGICAL ASSESSMENT • AVERAGE RIVER FLOWS ACROSS SCOTAND HAVE INCREASED BY ~ 20% OVER THE LAST 30 YEARS AFFECTING • RIVER BANK EROSION • FLOODING • IN-STREAM HABITAT • INCREASED SEDIMENT TRANSPORT Erosion downstream of Mondynes Siltation at Tipperty

  7. An example of the use of LIDAR data in a ground model mapping stream power

  8. EVIDENCE OF RECENT CANALISATION

  9. Erosion on the Lower Bervie

  10. SEPA FLOOD MAP 1:200 YEAR EVENT

  11. MAJOR FLOOD DECEMBER 2012

  12. MOUTH OF THE BERVIE WATER NO EASY SOLUTION!

  13. ALWAYS LOOKING FOR VOLUNTEERS! THANK YOU

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