Road Drainage and Flood Risk - The Chesham Society Road...Flood Risk Improvement Works ......

Buckinghamshire County Council Road Drainage and Flood Risk

Alex Back Senior Strategic Flood Risk Officer Buckinghamshire County Council

Buckinghamshire County Council

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1. Road Drainage Maintenance

2. Road Drainage Projects

3. Flood Risk

5. Flood Risk Improvement Works

6. Chesham Flood Alleviation Scheme

Buckinghamshire Strategic Flood Management Committee 09 December 2014

Road Drainage and Flood Risk 24th October 2017

4. River Restoration


Road Drainage Maintenance

• Fullers Hill to Germain Street all cleaned and jetted • Waterside all cleaned and jetted • Hivings Hill to be cleaned and jetted before April

2018 • Hog Lane, Ashley Green • The Backs all cleaned and jetted • Amersham Road, Broad Street, Berkhamstead Road,

Ashley Green Road, Chesham currently being cleaned and jetted


Road Drainage Projects • 2017/18;

– Vale Road, Hawridge Road and Cholesbury Lane – Chapmans Crescent (new gully pot to prevent

property flooding) • 2018/19;

– Fryers Close – Fullers Hill

• 2019/20; – Ashotts Lane – Ashley Green Road


Flood Risk • Pednormead End Project

– River Restoration – Culvert – Property Level Protection – Project plan – Next steps

• Chesham Flood Alleviation Scheme


River Restoration • River Chess at Pednormead End now


Flood Risk improvement works • 100 residential and commercial properties at risk from a

combination of surface water and groundwater flooding • Replacing the culvert under Missenden Road and

Church Street to increase flow capacity • Property level resistance and resilience measures for

100 residential and commercial properties


Business planning process

• Proposed dates subject to change; • Feasibility study – complete • Outline business case - by March 2018 • Full business case – by November 2018 • Construction – by March 2020


Next steps • Work with community and CFlAG • Persuade residents and business owners to agree to

property level flood resilience and resistance measures

Chesham Vale Brook

Flood Alleviation Scheme

Vale Brook Culvert

• Vale Brook runs underneath Chesham in a series of culvert sections.

• Culvert sections over 100 years old, brickwork crumbling and filling with debris.

• Worst sections of culvert expected to “fail”

(partial or full collapse/blockage) in 10 years time.

• Could cause structural damage to buildings above, as well as increase flood risk.

• Culvert too difficult and expensive to repair due to running underneath a large number of private properties.

Preferred Option

• Working with Chesham “Masterplan” by re-routing the culvert away from the town centre.

• Large sections of culvert to be opened. • Old failing culvert to be filled to ensure it is structural

sound.

Red = current culvert

Green = new open channel

Blue = new culvert where the brook needs to flow underneath infrastructure


Alex Back [email protected]

Road Drainage and Flood Risk - The Chesham Society Road...Flood Risk Improvement Works ......

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