Flood Risk Management (Scotland) Act

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1 Flood Risk Management (Scotland) Act Flood Hazard Maps Mark McLaughlin, Principal Hydrologist, SEPA British Hydrological Society Symposium Birmingham, 4 September

2 Long-term process Risk-based and planled Improve the application of flood risk management functions Sustainable flood risk management Catchment-based Wider benefits A more holistic approach to managing flood risk Improved working relationships between responsible authorities 2

3 FRM plans FRM plans hazard and risk Delivery 2016 / 2010 December 2013; Needed late 2012 draft appraisals Return periods Flood hazard maps Extent, depth & velocity Flood risk maps Impact on people, economy and environment prepare NFRA lead authorities and 3

4 Flood Hazard Maps 4

5 Modelling Strategy APPRAISAL FLOOD HAZARD MODELLING FRMP Partnership type Strategic Pre - feasibility Feasibility NATIONAL (STRATEGIC) Aim: meet the requirements of the EU Floods Directive Objective: produce a national scale flood hazard map CATCHMENT (FEASIBILITY) Aim: inform FRM options appraisal & NFRA; support LLA Objective: produce a catchment scale flood hazard map LOCAL (DESIGN) Aim: support LLA in LFRMP development Objective: support detailed model development SEPA only Cooperative Collaborative INCREASING LEVEL OF PARTNERSHIP ENGAGEMENT 5

6 Inherent uncertainty Flow (cumecs) Flow (cumecs) Flow (cumecs) Flow (cumecs) Winter Flows - River Nith at Friars Carse Winter 5 per. Mov. Avg. (Winter) Linear (Winter) R.Teith at Bridge of Teith winter flows (Oct-Mar), Annual winter flow 5 year moving average Linear (Annual winter flow) Complex natural systems Natural variability Necessary assumptions Data availability Winter Flows, R Kelvin at Killermont, Winter 5 per. Mov. Avg. (Winter) Linear (Winter) R.Tay at Ballathie winter flows (Oct-Mar), Annual winter flow 5 year moving average Linear (Annual winter flow) Time, complexity, data requirement Simplified Intermediate Detailed Model Characteristics 6

7 Fluvial Flood Hazard Map 7 2D Hydraulic Modelling c domains covering all catchments > 3km 2 Hydrology; National Design Flow Dataset updated with SEPA hydrometric data DTM - LiDAR/ NEXTMap - mixed resolution grid Structures Defences - SFDAD Multiple runs

8 Fluvial Outputs: Extents & Depths 8

9 Fluvial Outputs: Velocity & Hazard 9

10 Fluvial Hazard Map: Limitations National strategic level modelling Hydrology based on CEH Flow Grid, implications of frequent return periods, i.e. Q10 No bathymetric considerations Mixed resolution modelling grids due to availability of LiDAR Simplified representation of structures such as bridges, culverts, defences 10

11 Confidence tracking for flood hazard datasets Confidence framework How to assess and track confidence in flood models Scoring approach based on broad components of uncertainty: hydrology, topography, method. Considers model performance v observational data, other accepted modelling and supporting information. Confidence tracking datasets for fluvial, pluvial and coastal hazard maps.

12 Future Development Prioritised development Confidence, risk, benefit accrued Calibration Gauged data Flood event data capture Historic event data Model guidance Consistency LAs 12

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