Kilbogget Park Flood Alleviation Scheme Kilbogget Park Flood - PowerPoint PPT Presentation

Kilbogget Park Flood Alleviation Scheme

Kilbogget Park Flood Alleviation Scheme • Flood Alleviation – Flood Storage • Public Safety – Trash Screen Kilbogget Park 2

Seafield/Bayview Area - Flooding Kilbogget Park 3

Public Safety Existing Screen Temporary Sluice Kilbogget Park 4

Public Safety Kilbogget Park 5

Flood Alleviation - Method • ECFRAMS – Options study in relation to flooding in Seafield/Bayview Areas & elsewhere – Use Kilbogget Park and Glenavon Park as Flood Storage Areas • Feasibility Study – Detailed hydrological study – Detailed assessment of flow control measures – Use a structure to throttle back flow through the 1.2km culvert downstream of the park Kilbogget Park 6

ECFRAM Preferred Option Kilbogget Park Flood Alleviation Scheme

Flood Storage • Slows flow into culvert and area downstream • Water backs up in Killbogget Park – natural valley • It takes longer for flows to reach Seafield/Bayview • The duration of flow increases • The peak of the flow is lowered – reducing the risk of flooding downstream. Kilbogget Park 8

Flooding of Park • Must not flood residential properties • Limit to storage volumes • Bypass at greater than 100year event. • In the long term project must be combined with further storage downstream of culvert Kilbogget Park 9

Ecological • AA screening – No requirement for Natura Impact Statement – No significant impact • Local Ecology – Ecological Impact Assessment – Mitigation required during construction – No significant impact to Local Ecology • Consultation – Inland Fisheries Ireland – National Parks and Wildlife Service – DLRCC Heritage Section Kilbogget Park 10

Engineering • Ground conditions/Topography • Public Safety • Operational/Non blocking - Brief • Maintenance Kilbogget Park 11

Visual • Consultations with Parks • Granite Cladding & Viewing Platform • Photomontage – Existing – With proposed structure Kilbogget Park 12

Preferred Flow Control Structure • Concrete structure • Max 1m 2 flow throttling orifice • Trash screen • Overflow screen • Intermediate structure – Reduce flow velocities – Protect existing culvert entrance – Facilitate maintenance Kilbogget Park 13

Photomontage View - Detailed Kilbogget Park 14

Photomontage View - Detailed Kilbogget Park 15

Flow Control Structure – Insert Plan Far Field Kilbogget Park 16

Flow Control Structure – Insert Plan Near Field Kilbogget Park 17

Flow Control Structure • Insert section Kilbogget Park 18

Photomontage - Aerial View Existing Situation Extreme Flow • Flooding in Park now – 100 year event Kilbogget Park 19

Photomontage - Aerial View Proposed Structure Extreme Flow Kilbogget Park 20

Kilbogget Park Flood Alleviation Scheme