10/01/2015 Eardisland Feasibility Study Claire Storer Principal Engineer 1 1. Questionnaire Analysis 2. Flood Data Review 3. Potential Alleviation Options 2 1
10/01/2015 Questionnaire 73 responses 3 areas: • Flood History • Priorities / Concerns • Actions / Solutions ~30% response rate Average length of occupancy – 20 years 38% households receive flood warnings 3 Flood History Flooding experienced Restricted access to Contact with other at property – internal / property (%) householders external (%) experiencing flooding to property (%) 15 66 18 6 responses stated internal flooding had occurred Disruptive flooding – indicated to occur every year or so Main events – Feb 2014, Jul 2007, Oct 1998 4 2
10/01/2015 Flood History % attributed primary cause of flooding 70% 60% 50% 40% 64% 30% 20% 25% 10% 11% 0% Watercourse Highway Flows Overland Flows ~ 2/3 responses stated a cause 5 Concerns & Priorities Listed as top priority 2% 0% 3% 3% 12% 3% Insurance premiums 8% Actual flood damage to property Impact on house values Loss / disrupted access to your property Loss / disrupted access affecting the parish Impact on emergency services 15% Impact on the environment Impact on businesses/local services 38% Stress/worry over whether flooding will occur Access to medical care 15% 6 3
10/01/2015 Concerns & Priorities Listed in top 3 priorities 3% 3% 3% 4% Insurance premiums 22% Actual flood damage to property 7% Impact on house values Loss / disrupted access to your property 7% Loss / disrupted access affecting the parish Impact on emergency services 18% 14% Impact on the environment Impact on businesses/local services 18% Stress/worry over whether flooding will occur Access to medical care 7 Concerns & Priorities Main concerns: • Insurance premiums • Flood damage to property • Impact on house values • Loss / disrupted access to property Frequent flooding causing disruption and more severe flooding causing property damage of equal importance 8 4
10/01/2015 Actions & Solutions Alleviation measures 0% % responders listed as most effective 2% 0% 0% 3% Increased maintenance to watercourses 3% 5% Increased maintenance of drains and sewers An upgrade of existing drainage systems to increase capacity 8% 40% Measures to control the direction of overland flows Upstream flood storage 10% Enlarged watercourse channels or culverts Formal raised flood defences Other measures to prevent floodwaters entering properties 30% Better information on flood risk to prepare for floods Improved flood warning 9 Actions & Solutions % responders willing and able to help reduce the impacts of flooding in the parish 100 44 75 81 89 50 Unwilling and/or or unable Willing and able 56 25 19 11 0 Assisting with clearing drains or Involvement in Eardisland Parish Would you support an increase in channels Council Flood Working Group precept in order to fund minor works 10 5
10/01/2015 River Flooding EA River Arrow model 11 Area 1 12 6
10/01/2015 Area 2 13 Area 3 14 7
10/01/2015 Area 4 15 Area 5 16 8
10/01/2015 Area 6 17 Area 7 18 9
10/01/2015 Surface Water Flooding 19 Potential Alleviation Options Screening to shortlist options for further assessment 30 measures identified Type Of Measure: • Do Nothing / Minimum • Source Control – Land use; sustainable drainage; Flood storage; River regulation • Pathway modifications – Ground raising; Flood defences; Channel & structure improvements; Property protection. • Resilience – Flood plans; Modelling & mapping; Property resilience; Emergency planning Screening criteria: • Environmental • Area benefitting • Social factors / land ownership • Standard of protection • Cost • Feasibility • Maintenance • Risks • Likelihood of funding • Physical constraints • Potential for community led delivery 20 10
10/01/2015 The Long List! 21 Shortlisted Options Following identified to potentially warrant further investigation as part of the study: • Remove / lower weir at Mill Stream offtake • Channel improvements (Southall Brook principally) • Tadpole Bridge improvements • Overland flow routing • Property flood protection / resilience Following identified to potentially provide benefit but further work not proposed as part of this study: • Business continuity / resident flood plans • Flood risk identification & mapping (likely to support a scheme) • Improved emergency preparedness, response & planning 22 11
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