Settlement specific action plan

About the Settlement/ village

Village name Kings Worthy District Catchment(s) Itchen, main river

Ward name Kings Worthy

No. Residential properties: 1828 No. other 548 Critical 20 (By ward) buildings (by Infrastructure ward) (Ward) Estimate by settlement 1687 By settlement 296

About the Local Groundwater Flood Risk Areas at risk of groundwater flooding in have been given a risk ranking based primarily on the number of properties which were reported to have flooded during 2000/01. This includes internal groundfloor flooding and basement flooding, and external flooding by sewage. Other factors, including potential flooding to roads and critical infrastructure and actions taken since 2000/01 to reduce flood risk have also been taken into consideration. The ten areas with the highest rank have been assigned a ‘high’ groundwater flood risk and have had village specific action plans developed. Kings Worthy has currently been ranked as number 5. Overall local flood risk for groundwater High

Other local flood risk assessment Ranking of ward by local flood risk 41 out of 248 EA surface water N/A and the measures identified to manage the risk (LFRMS)

Flood risk to property from rivers and sea (based on Environment Agency flood maps) Identified community Not applicable Communities at risk ranking (EA database) Not applicable Number of properties at significant or moderate flood risk Not appicable

Summary

Flood incidents recorded There are records of flooding in the area in 2000/01, however there are no official records of previous groundwater flood events on the same scale . In 2000/01, 21 properties flooded (excluding external ‘clean’ flooding); 12 with cellar flooding and 9 with ground floor flooding. No commercial properties suffered.

The A33 and A34 are also potentially at risk, although there is no records of flooding to these roads.

Type of flooding: Ground floor flooding, cellar flooding. Severe road flooding (Springvale road)

Settlement characteristics Residential area with surrounding countryside, woodland and agriculture. Some industrial to the south.

Critical infrastructure within the ward includes: 19 x Electricity Substation 1 x School NO FIRE AND RESCUE. NO POLICE. NO AMBULANCE. NO AIRPORT

No major watercourses present.

Landscape, biodiversity and cultural heritage features and designations within 2km:  South Downs National Park  River Itchen SSSI  River Itchen SAC  Alresford Pond SSSI  Iron Age field system, banjo enclosure and Romano-British villa, 500m east of Woodham Farm (Scheduled Monument)  Late Iron Age settlement site N of Grace's Farm (Scheduled Monument)  Anglo-Saxon cemetery in Worthy Park (Scheduled Monument)  Site of St Gertrude's Chapel (Scheduled Monument)  Over 50 listed buildings  Rivers Test and Itchen (Catchment Sensitive Farming Capital Grant Scheme Target Area and Catchment Sensitive Farming Delivery Initiative 2011-2014)

Future risk Detail of future risk plus objective assessment of climate change on risk Most climate change models indicate that we are likely to experience drier summers, albeit with more intense rainafll when it occurs, and wetter winters. There is a view that groundwater recharge may decline by 5-15%. However, as groundwater flooding occurs primarily as a response to extended periods of rain during late autumn and early winter, there may be an increased risk of groundwater flooding. This is far from certain and the buffering effect of increased groundwater storage (due to lower overall recharge) may mitigate any such effect.

Note on areas of development: Specific policies should be considered by the Planning Authority to control development within this risk area. This should involve suitable property resilience levels until such time as the source, pathways and receptors are understood at a detailed enough scale to ensure that any new development is not at risk of flooding. Any new development must not increase flood risk elsewhere. Kings Worthy Parish Plan states that “Any future development, particularly in the Springvale Road area should take account of the risk of flooding and should avoid exacerbating the problem.”

Infiltration drainage should be avoided unless it can be clearly demonstrated it will not have a local impact through increased groundwater rise. Septic tanks should also be avoided unless it can be demonstrated that they can operate successfully during periods of extreme groundwater level.

Measures delivered to reduce risk since 2000/2001

What has happened? Action By Whom When Constraints Improvements to the Environment Agency Flood Environment 2007 Flood alert service not Warning Service- Agency extended to Kings Worthy (See Telemetry borehole installed at Harestock Corner (SEE BELOW) map above and measures below). Survey, clear and repair the culvert that runs HCC Unknown down Springvale Road from Lovedon Lane to Cressbed area in Headbourne Worthy. Develop a Village Flood Plan Parish Council in Unknown liaison with HCC Creation of Flood Action Group Parish Council in Unknown liaison with EA

For further information regarding the FAG or the flood action plan:  Kings Worthy Parish council website: http://www.theworthys.org.uk/KWcouncil.php

Actions by water utilities: NONE IDENTIFIED

Identified Mitigation Mitigation proposed includes: Mitigation By Whom Review the maintenance and provision of the surface water drainage system and establish proactive maintenance schedule and flood incident reaction plan (SEE BELOW) HCC, WDC Review the need to install a pumping system to reduce groundwater cellar flooding in individual properties Individual property owners Sign up to Parish Lengthsman initiative 2014-15 Kings Worthy PC Information gathering Kings Worthy PC, HCC

Is there residual risk that needs to be managed? Further residual risk will be reviewed following consultation with and comments from local residents.

Future measures needed to reduce risk

Measure By Whom PHYSICAL ACTIONS Undertake survey (including CCTV of pipes as necessary) to establish sections of culverts, drains, pipes not addressed by works previously undetaken by HCC. –particularly down Springvale Road Where HCC./ WDC necessary, undertake repair and or replacement of inadequate drainage features identified in survey. MAINTENANCE ACTIONS Following completion of above surveys/ actions, identify need for and frequency of routine inspection Riparian owners prompted by of open surface water channels/ drainage pathways culverts, including field drains etc. to check for Kings Worthy PC blockage and clear as necessary Establish and formalise proactive maintenance response schedule in response to high groundwater levels, to include: Agree with EA suitable “ trigger.”….as there is no current “borehole based” alert service, identify other triggers that may be used (e.g. flow in winterbournes at defined points) HCC/ Environment Agency/

WDC/ Riparian owners Check and clear as required: Road drainage gullies; road drainage culverts; all other surface water channels and drainage pathways – ensure all key locations along Springvale road are cleared if blocked.

AWARENESS RAISING and INFORMATION GATHERING There is presently no flood alert service for Kings Worthy:  Consider whether groundwater levels monitored at Harestock (which cover Harestock and Headbourne Worthy) could be used to issue alerts at Kingsworthy Environment Agency/ HCC  If so, identify relevant trigger levels and include Kings Worthy in coverage of the alert area - “Groundwater flooding in Headbourne Worthy and Littleton”.  If levels at Harestock not relevant, consider identifying key borhole (for monitoring) and

implement monitoring programme to establish local trigger levels  Dissieminate information and ensure residents are made aware of and sign up to the new service as and when implemented . Ensure that residents are made aware of advice on how to protect themselves and their property in Kings Worthy PC times of flooding Encourage individuals to create a bespoke flood action plan. Kings Worthy PC Keep accurate records of flood events as they occur Kings Worthy PC, HCC