Information Classification: CONTROLLED
Flood Investigation Reports 2012 Last updated: 23/04/2018
Overview 2012 2012 was the wettest year on record in England, despite the first three months of the year being declared a drought. Flash flooding mainly resulting in surface water occurred on short occasions in July and August. Coastal flooding occurred in both October and December. Prolonged rainfall led to surface water and fluvial flooding in November and was then repeated in December, affecting many of the same communities and properties. 6 July 2012 Heavy rain across the county led to mainly surface water flooding of some properties and roads. Flooding occurred at properties in Bugle, St Austell, Penzance and in the Camborne and Redruth areas. 17 August 2012 In the morning, two bands of rain swept across Cornwall causing surface water flooding problems mainly affecting roads. A section of the A38 in the Glynn Valley between Bodmin and Liskeard was closed for around 2 hours due to flooding. In Truro, businesses in Bridge Street were inundated by surface water coming off the highway. 17 and 18 October 2012 There was coastal flooding when a low pressure weather system brought a storm surge and gale force winds that coincided with the spring tides. Flooding particularly affected Looe, Mevagissey and Fowey but was also reported at Bude, Port Isaac, Polzeath, Perranporth, Hayle, Newlyn, Penzance, Falmouth and Tresillian. Sea defences were badly damaged at Long Rock. • Flood Investigation Report for Fowey (Oct) • Flood Investigation Report for Looe (Oct) • Flood Investigation Report for Mevagissey (Oct)
22 to 27 November 2012 This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event. Notably river levels on the Hayle, Gannel and SeatonRivers were the highest in over 40 years of recording. Across Cornwall an estimated 260 properties flooded. Many of these were isolated incidents that do not trigger a Flood Incident Report.
• Rainfall analysis for 22-27 November 2012 • Flood Investigation Report for Cawsand • Flood Investigation Report for Hessenford • Flood Investigation Report for Kingsand • Flood Investigation Report for Ladock • Flood Investigation Report for Millbrook • Flood Investigation Report for Newlyn Information Classification: CONTROLLED
• Flood Investigation Report for Perranporth • Flood Investigation Report for Polperro • Flood Investigation Report for Portmellon (further detail required) • Flood Investigation Report for St Just in Roseland (further detail required) • Flood Investigation Report for Trenear
14, 15 and 16 December 2012 Further coastal flooding occurred when a series of spring tides coincided with a low pressure system and strong south easterly winds. The tide level was not exceptional but the combination of a large swell with high winds led to overtopping of sea defences and flooding of many properties, especially along the south coast. Tidal flood gates were shut at Truro and Polperro. Large waves resulted in the closing of the promenade at Penzance. • Flood Investigation Report for Fowey (Dec) • Flood Investigation Report for Looe (Dec) • Flood Investigation Report for Mevagissey (Dec)
18 to 31 December 2012 This event occurred at the end of a particularly wet summer and autumn and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. In addition, it came just one month after another major event in November that led to widespread flooding across Cornwall. The overall event is considered to have started late on Tuesday 18 December and lasted for 2 weeks. Within this there were periods of more intense rainfalls. Flooding occurred across Cornwall during this event affecting many of the same properties that were flooded in November. • Rainfall analysis for 18-31 December 2012 • Flood Investigation Report for Helston • Flood Investigation Report for Ladock • Flood Investigation Report for Lostwithiel • Flood Investigation Report for Mevagissey • Flood Investigation Report for Mousehole • Flood Investigation Report for Porthallow • Flood Investigation Report for Porthleven
Cornwall Council Flood Investigation Report
Date: 17&18 October 2012 Location: Mevagissey
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
A low pressure weather system brought a storm surge and gale force winds that coincided with the spring tides.
Description of flood event:
Fire fighters from Mevagissey attended the main square on the evening of Wednesday 17 October and helped with the clean-up after some businesses flooded.
They also helped prevent floodwater from sweeping through properties and directed traffic through the town until police arrived at the scene.
A number of businesses including the Ship Inn and the Mevagissey News were flooded internally as were some residential properties.
No of properties flooded: 5?
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater
Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Coastal Authority
Environment Agency Responsibilities for flooding from the sea
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes / No Who?
What? A strategic approach is required for defending Mevagissey against coastal flooding.
Is there further information available on No record?
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Cawsand
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
During the evening of 24 November the Cawsand Stream rose in response to heavy rainfall. Sandbags were used to raise the banks but these were overtopped and water spilled onto St Andrews car park. The water backed up against the car park wall and then flowed down Armada Road, into The Square and across The Bound to the sea.
No of properties flooded: 5 (1 shop, 1 pub, 2 residential & 1 gig clubhouse)
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes May consider proposing Property Level
Cornwall Council Protection if residential properties are susceptible to repeated flooding. Responsibilities for managing flood risk
Environment Agency from the Cawsand Stream, which is Main River.
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes Who? Cornwall Council What? Consider candidate for PLP.
Is there further information available on Yes – EA Reconnaissance map record?
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Hessenford
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
Water broke out of the left bank of the River Seaton upstream of the A378 road bridge, flooding the public house. At the same time surface water runoff flowed westwards down Fore Street until it met with the fluvial water, flooding properties and then returned to the river downstream of the road bridge.
No of properties flooded: 5 (1 commercial, 4 residential)
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes May consider proposing Property Level
Cornwall Council Protection if residential properties are susceptible to repeated flooding. Responsibilities for managing flood risk
Environment Agency from the River Seaton, which is Main River.
South West Water
Private/community
Other
Further actions: Are any further actions required? No Who? What?
Is there further information available on Yes – Reconnaissance map record?
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Ladock
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
High river levels overtopped Tresillian River channel banks in the car park of the Village hall causing flooding which flowed down the road and re-entered the river in field opposite the pub.
Fluvial flooding was exacerbated by surface water flowing down School Hill. the road gullies along school hill had blinded over with leaves and debris, which did not allow surface water flows to enter the road gullies along the road forcing all of the water to try to enter the gully at the bottom of School Hill. At around 22:00 the river overtopped its banks at which point the surface flows combined with the rivers flows along the main road.
The River also came out of bank further downstream flooding a section of the road.
No of properties flooded: 13
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Surface water, highways
Environment Agency Main River
South West Water
Private/community
Other
Further actions: Are any further actions required? Further study Who? What?
Is there further information available on Yes – Reconnaissance map. record?
Cornwall Council Flood Investigation Report
Date: 24-25 November 2012 Location: Millbrook
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
Surface water runoff from hillsides and roads. The Millbrook Stream came out of bank but did not flood any properties. Ordinary watercourse at Millpool Head contributed to flooding. Most property flooding occurred around the Parade and King Street.
Local residents felt that if the tidal defence had been operated so that the lake level was lowered at the onset of flooding then the impacts would have been lessened.
No of properties flooded: 23
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Surface water, ordinary watercourse. Responsibilities for managing flood risk from the Millbrook Stream, which is Main Environment Agency River. Responsible for operating tidal defence.
South West Water
Potential to create a community flood Private/community group.
Other
Further actions: Are any further actions required? Yes Who? Environment Agency/public What? EA to consider operation of sluice at lake and whether Parish Council could play role in lowering lake level at critical times.
Is there further information available on Yes – Reconnaissance map. Results of record? flood surgery.
Cornwall Council Flood Incident Report
Date: 24 November 2012 Location: Newlyn
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
The Newlyn Coombe River overtopped, flowing onto the road and into the Coombe, and subsequently the Strand.
No of properties flooded: 15
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Surface water. Highway drainage.
Environment Agency Main river
South West Water Sewers and reservoir operation.
Private/community Potential community flood group.
Other
Further actions: Are any further actions required? Yes Who? Cornwall Council What? Further work by EA, CC and SWW
Is there further information available on Yes – Reconnaissance map. record? Numerous follow up actions on file.
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Perranporth
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
The Bolingey Stream overtopped the flood bank upstream of the footbridge on Station Road. Water ran down Station Road and flooded three properties on St Piran’s Road. Properties at Eureka Vale were protected by sandbags. Gardens of properties in the Budnic Estate flooded. The fire service pumped water from two properties in St Georges Hill and South West Water supplied a submersible pump for one. Flood water was sewage contaminated.
New Road was flooded and impassable, restricting access to businesses.
No of properties flooded: 5
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Surface water. Highway drainage.
Environment Agency Main river
South West Water Sewers.
Private/community Potential community flood group.
Other
Further actions: Are any further actions required? Yes Who? Further work by EA, CC and SWW What? EA to follow up flood improvements on Bolingey Stream. SWW to improve operation of Sewer Pumping Station. CC to consider improvements to highway drainage.
Is there further information available on Yes – Reconnaissance map. record? Flood surgery held on 27 November 2014.
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Polperro
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
Langreek Stream culvert intensified surface water flooding & wash out of May Gurney road works on A387/Langreek Rd. Coombe/Main Rd - Garages/Homes in depressions appeared to have had minor ingress from surface water. River Channel appeared to have had more carrying capacity. Blocked drainage channels & blocked screen at Langreek Rd added to surface water. Mill Hill - Unknown number of premises flooded. Access blocked by standing water, blocked drains observed at Lansallos Street/Landaviddy Lane/Coombe & Main Road. Lansallos Street/Quay Rd - Blocked drains main issue and some retail premises appeared to be flooded, but actual number not known. The Warren - Blocked culvert was causing surface water flooding to lower properties on The Warren and restricting access to some properties - only minor, though difficult to assess which properties were affected as many were holiday homes.
No of properties flooded: At least 6
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Surface water. Highway drainage.
Environment Agency Main river
South West Water Sewers.
Private/community Community flood group.
Other
Further actions: Are any further actions required? Who? What?
Is there further information available on Yes – Reconnaissance map. record? Flood surgery held on 26 November 2014.
Cornwall Council Flood Investigation Report
Date: 24 November 2012 Location: Trenear
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
This event occurred at the end of a particularly wet summer and antecedent conditions meant that groundwater levels were already high, soils saturated and river levels elevated. The overall event was made up of a number of contiguous events starting with a rainstorm on Thursday 22 November 2012. Friday was fairly dry. The bulk of the rainfall fell during Saturday 24 November. However, rainstorm conditions endured throughout Sunday, Monday and into Tuesday 27 November 2012. Flooding occurred across Cornwall during this event.
Description of flood event:
The river appears to have discharged onto the road from a culvert that may have been partially blocked. It then flowed into the rear gardens of a terrace of houses causing internal flooding.
No of properties flooded: 5
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater
Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highway drainage Environment Agency South West Water Private/community
Other
Further actions: Are any further actions required? Yes Who? Cornwall Council / Highways What? Improve highway drainage.
Is there further information available on record?
Cornwall Council Flood Investigation Report
Date: 14-16 December 2012 Location: Fowey
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
A series of spring tides coincided with a low pressure system and strong south easterly winds. This was combined with very heavy rainfall.
Description of flood event:
Overtopping of Town Quay. As the tide rose, drains also began to surcharge on Town Quay, Webb Street and Fore Street.
4 properties flooded. The Harbour Masters store, Fat Face shop, Juice Zone shop and toilets behind the town museum.
No of properties flooded: 4
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater
Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Coastal Authority
Environment Agency Responsibilities for flooding from the sea
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes / No Who? What? A strategic approach is required for defending Fowey against coastal flooding.
Is there further information available on Yes – Reconnaissance map record?
Cornwall Council Flood Investigation Report
Date: 14-16 December 2012 Location: Looe
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
A series of spring tides coincided with a low pressure system and strong south easterly winds. This was combined with very heavy rainfall.
Description of flood event:
Property flooding occurred mainly in East Looe, along Fore Street and Quay Street.
No of properties flooded: Approximately 50.
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater
Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Coastal Authority
Environment Agency Responsibilities for flooding from the sea
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes / No Who? What? A strategic approach is required for defending Looe against coastal flooding.
Is there further information available on Yes – Reconnaissance map record?
Cornwall Council Flood Investigation Report
Date: 14-16 December 2012 Location: Mevagissey
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
A series of spring tides coincided with a low pressure system and strong south easterly winds. This was combined with very heavy rainfall.
Description of flood event:
The Ship Inn flooded but no sandbags or flood boards were in place at the time. Other properties had flood boards/sandbags in place which prevented flooding.
The West wharf flooded and water surcharged from tide-locked drains outside the Ship Inn in Fore Street, in Market Square and Chapel Street.
No of properties flooded: Approximately 12.
Source of flooding: Fluvial Surface water Coastal Other
? Main River Highways Tides Groundwater
Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Coastal Authority
Environment Agency Responsibilities for flooding from the sea
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes / No Who? What? A strategic approach is required for defending Mevagissey against coastal flooding.
Is there further information available on Yes – Reconnaissance map record?
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Helston
Details of the flood event Did five or more properties flood internally? Probably Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
Water broke out of the River Cober around St Johns Road bridge. It flowed down St Johns Road, flooding 4 properties internally and back into the river.
The EA were over-pumping at Loe Bar.
No of properties flooded: 4 to 6
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways
Environment Agency Main Rivers
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes Who? CC, EA What? Work is underway to develop a Flood Alleviation Scheme for Helston.
Is there further information available on No record?
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Ladock
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
Water broke out of the Tresilian River around the road bridge. It flowed down the B3275 and flooded a number of properties on the opposite side of the road to the river.
Issues were similar to the November 2012 floods. .
No of properties flooded: 10?
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways
Environment Agency Main Rivers
South West Water
Private/community
Other
Further actions: Are any further actions required? Yes Who? CC, EA What? Work is underway to develop a Flood Alleviation Scheme for Ladock.
Is there further information available on A flood surgery was held on 14 January record? 2013.
A comprehensive report into the flooding has been provided by local residents.
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Lostwithiel
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
River Fowey overtopping its banks and seeping though the Quay Wall. Initial flooding as a result of seepage through the Quay Wall. Drains in North Street were surcharged.
No of properties flooded: 13
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council
Environment Agency Main Rivers
South West Water
Private/community
Other
Further actions: Are any further actions required? Who? What?
Is there further information available on record? A flood surgery was held on 8 January 2013.
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Mevagissey
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Yes flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
The Mevagissey Stream broke out of bank by the culvert where it crosses under valley road, and flooded the car park area beneath which the river is culverted. Properties around Chapel Square car park and Chapel Street flooded as water rose up through the floors. Drains at the end of Chapel Street surcharged.
No of properties flooded: 13
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways
Environment Agency Main Rivers
South West Water Sewers
Private/community
Other
Further actions: Are any further actions required? Who? What?
Is there further information available on No record?
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Mousehole
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
Along the Tumble Tyn, the culvert between Wayside and No 6 Chapel Street was overwhelmed by the high flows. The stream water therefore spilled out onto the highway and into the road gullies leading to the combined sewer. This surcharged the sewer network leading to flooding of the toilets and gullies of a courtyard complex.
The Paul Stream broke out of bank upstream of the School. This may be related to blockage of the screen where the stream drops into a culvert. This water, combined with surface water, led to flooding of the school playground and runoff flowing down Foxes Lane.
The Paul Stream also overflowed at “The Dam” leading to flows down both North Street and Chapel Place/Duck Street.
Heavy surface water flows were also noted running down the hill behind the Methodist Church and onto Portland Place. Many manhole covers lifted, both on the culverted stream and combined sewer system.
On 25 December two properties along Brook Street suffered from internal flooding caused by groundwater rising up through the floor.
No of properties flooded: 7
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways
Environment Agency Main Rivers
South West Water Sewer flooding and DG5 obligation
Potential to create Community Flood Private/community Group
Other Farmers, agricultural land owners
Further actions: Are any further actions required? Yes Who? CC, EA, SWW What? Surveys of drainage system. Work toward an integrated surface water management plan. Initiate dialogue with agricultural landholders. Explore formation of a Community Flood Group.
Is there further information available on Yes – Reconnaissance map. record? Flood surgery held on 17 January 2013.and various follow up meetings.
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Porthallow
Details of the flood event Did five or more properties flood internally? Yes Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
Flooding of properties occurred through multiple causes including overtopping of a river embankment, an overwhelmed culvert and a blocked screen.
No of properties flooded: 9
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways, ordinary watercourse
Environment Agency
South West Water
Private/community
Other
Further actions: Are any further actions required? No Who? What?
Is there further information available on No record?
Cornwall Council Flood Investigation Report
Date: 22 December 2012 Location: Porthleven
Details of the flood event Did five or more properties flood internally? No Did at least one property flood internally that has also Unknown flooded internally within the last five years? If the answer to either question above is Yes then this Incident Report will form part of a Section 19 Flood Investigation Report and will need to be published.
Description of weather conditions:
Heavy rainfall fell on Wednesday 19 and Thursday 20 December followed by particularly heavy downpours over the night of Friday 21 and throughout Saturday 22 December 2012.
Soils were saturated and groundwater levels particularly high before the event.
Description of flood event:
The Methleigh Stream broke out of bank at the road bridge just downstream of the sewage works. The flood waters inundated the road and the floodplain on the left bank and flooded the sports field. It then flooded three properties on the right bank before flowing back into the river.
No of properties flooded: 3
Source of flooding: Fluvial Surface water Coastal Other
Main River Highways Tides Groundwater Ordinary Sewers Waves Other watercourse
Agricultural Erosion
Other
Relevant authority Interest / notes
Cornwall Council Highways
Environment Agency Main river
South West Water
Private/community
Other
Further actions: Are any further actions required? No Who? What? Potential for property level protection if there is a repeated flooding.
Is there further information available on No record?