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The latest rainfall can be viewed in the data section


The latest rainfall can be viewed in the data section


The latest rainfall can be viewed in the data section


The latest rainfall can be viewed in the data section


The latest rainfall can be viewed in the data section.


The latest rainfall data can be viewed in the data section.


The latest rainfall data can be viewed in the data section.


Rainfall data for February 2016 is now available (see data section).  The rainfall for February at the site at Naish was 49mm, which is lower than the February average of 58mm (15% lower).  This has meant the 2 & 3 month antecedent rainfall has reduced, although it is still currently above the 80mm antecedent rainfall threshold line.


The 2015 cliff monitoring Reports for Barton on Sea is now available to download.  This report includes the cliff point data (graphs), rainfall data and analysis, aerial photography analysis, and lidar and laser scan survey comparisons (cliff & slope changes).


The latest rainfall , collected at Naish Holiday Park, Hampshire, indicates that rainfall for autumn into winter was in fact lower than average.  Following a very wet August when 124mm of rain was recorded against an average of 53mm (a 135% increase!), September was close to average 60mm (51mm average) but then October 45mm (90mm), November 70.4mm (102mm) & December 81mm (87mm) were all lower.  So by December, the 2 & 3 months rainfall had yet to reach the 80mm antecedent rainfall trigger line.  However, with the increased rainfall in the second half of December combined with January's rainfall of 138mm (82mm), has meant the second half of the winter (up to the end of Jan 16) has been wetter than average with January experiencing a 70% increase in the average monthly rainfall.  Despite this, between September 2015 and January 2016 (inclusive), rainfall recorded at Naish Holiday Park has been about 5% lower than average (394mm against an average of 412mm).

With the wetter period into 2016 pushing the antecedent rainfall past the trigger level, landslide activity has now been reactivated in the areas with ongoing instability, particularly along the undercliff below Sea Road and between Marine Drive West Car Park and Sea Road.  Although cracks along the cliff top are not visible at the moment, in places the cliff is showing signs of minor failure and movement, so the risk of further cliff failure is increased.  In response to this, a 40m section of the cliff just west of Marine Drive West Car Park has now been fenced off to protect the public from this area while it is active.  See details adobe icon Fencing Location [1Mb].  The cliff will then be monitored and assessed over the next few weeks to decide how long the fencing needs to be in place before being removed.


The rain gauge has now been downloaded and the latest rainfall data are now available in the data section.

The data indicate that 2015 hasn't been a particularly wet year at the Naish Farm location.  The year totalled 688mm which is lower than the 22 year average of 751mm per year.  However, the build up of winter rainfall means the two and three month antecedent levels are now close to the 80mm rainfall trigger level.  In addition, small amounts of ground movement have been detected recently.  At present, it is looking likely that January 2016 will be a wet month and this could mean the 80mm trigger is exceeded.  We may therefore expect ground movement to occur at an increased rate over the next couple of months.  NFDC Coastal Group and the Channel Coastal Observatory (hosted by NFDC) are closely monitoring developments.


Cliff Monitoring Reports for 2013 and 2014 have now been added under the reports section.


The latest rainfall figures taken from our raingauge at Naish are now available in the data section.  A total of 124mm of rain fell in August 2015 and this is the wettest August that NFDC have recorded in 21 years of collected rainfall data.  The next wettest August was in 1999 when 98.9mm fell.  By contrast, the driest August was 1995 when a mere 3.4mm fell.


The latest rainfall figures taken from our rain gauge at Naish are now available in the data section.  The amount of rain that fell in 2014 was 924mm and, despite a dry December, this still meant that 2014 was the third wettest year (recorded at this location) since 1994.  The top five years for precipitation are as follows:

2012 - 975mm
2000 - 962mm
2014 - 924mm
1994 - 918mm
2002 - 907mm


Rainfall figures up to the end of August are now available in the data section.


The final reports produced by Geotechnical Engineering Limited are now available in the reports section.  These documents are split into several appendices and include borehole logs and photos, laboratory test results and the geotechnical survey by Terradat Ltd.  Also included is the final draft copy of the Data Analysis Report by Halcrow Group Ltd (CH2MHILL).


This winter's rainfall has again been well over average levels.

Up to date rainfall information from the NFDC rain gauge located at Naish Caravan Park is now available (see adobe icon Rainfall [170kb] ).  The rain gauge recorded the following monthly rainfall figures over the winter period (average figures in brackets).

  • October 144mm (92mm) = 156% of the normal monthly rainfall
  • November 59mm (101mm) = 58% of the normal monthly rainfall
  • December 143mm (90mm) 159% of the normal monthly rainfall
  • January 167mm (79mm) = 211% of the normal monthly rainfall
  • February 109mm (59mm) = 185% of the normal monthly rainfall
  • March 39mm (49mm) = 80% of the normal monthly rainfall

Sea road slip

Total rainfall October 2013 to March 2014 was 660mm (470mm) = 140% of the normal rainfall for this period.  For comparison, the total rainfall for the same 6 month period over the previous four years is as follows:

  • October 2012 to March 2013 was 573mm = 122% of the normal rainfall
  • October 2011 to March 2012 was 229mm = 49% of the normal rainfall
  • October 2010 to March 2011 was 372mm = 79% of the normal rainfall
  • October 2009 to March 2010 was 611mm = 130% of the normal rainfall

Increased rainfall has been identified as having a direct relationship on levels of groundwater and cliff instability.  As a consequence, ground movement has continued along the frontage, particularly along the section between Sea Road and Hoskins Gap, where there are large unstable areas of soft ground and several metres of the cliff top has been lost, especially in the vicinity of Sea Road.

This has occurred due to the existing landslides becoming reactivated along this section, which has also resulted in the loss of the access tracks through this section.  There is presently no access between Barton on Sea and Highcliffe.

Survey teams from the Channel Coastal Observatory have been monitoring the site using land based remote sensing laser scanning GIS equipment (LiDAR).  This has meant that comparisons can be done between surveys undertaken before and after the recent movement.  An image showing these changes is presented in the data section.


 Cliff House Laser Scan

  • Weekly updates for weeks 5 & 6 are now available in the progress section.  Due to a combination of minor delays (following problems associated with deeper drilling) and additional works (such as additional boreholes in front of the Cliff House Hotel) the site investigations have had to move into a 7th week.  There is now only one drilling rig left on the site to complete the last hole, which will then be fitted with several piezometers.  Steel caps will then be fitted to all the remaining uncapped installations.  It is therefore planned for the compound to be taken down at the end of this week and over the weekend.  Monitoring of all the installations has already begun and this will now carry on for a period of at least a year.
  • A laser scan, covering the cliff top across the study area, was completed by NFDC coastal scientists from the Channel Coastal Observatory on Monday 1 July.  The 3D map that will be produced from this survey will be used in conjunction with aerial photographs and maps to form a baseline plan.  This will then be used to present data from the geological surveys and borehole logs, the geophysics survey and monitoring information from the instruments.



  • Latest rainfall data is available under data section or by using this link . The rainfall in spring has been lower than average with 35.6mm falling in April (average 51mm), 44mm in May (average 48mm) and 15.8mm in June, up until 17 June (the average for June is 50mm).  This drier period has meant that the ground movement along the lower cliff has reduced and stability has increased significantly.
  • The better ground conditions have allowed the ground investigations to progress very well. In addition, with dry ground, it had enabled the drilling working areas to be maintained very well with minimal amounts of mess and only straightforward reinstatement needed.


  • Works have now been progressing reasonably well over the first two weeks, with some good progress made.  The first weekly report is now available in the Progress Section.  A selection of photographs from week 1 will also be added to the image gallery.


  • Work has now finally started on the Barton on Sea Ground Investigation Works with mobilisation taking place on Monday 20 May, resulting in the compound being set up in part of Marine Drive West car park and the arrival of the first drilling rig.  The geophysics and seismic surveys are now well underway, as is the buried services survey.  Drilling the first borehole commenced on Tuesday 21 May (borehole no 14), and had reached a depth of 20m by Wednesday afternoon.
  • The program is now available under Progress which provides details of the likely duration of each borehole and when each borehole will be drilled.  Weekly updates in the form of progress reports will also be available here.
  • A selection of photographs will also be available under Image Gallery on a weekly basis detailing different aspects of the work.


Pioneer Rig

  • Additional reports have now been added to the Reports Section, including a Geomorphological Map of the Barton on Sea frontage.  Case studies of similar work to these site investigations are now also available under Technical Area.  There are also two data sheets giving information on the "Pioneer Drilling Rig" (see photograph opposite for example) which will be used to drill the majority of the holes.


  • Updated rainfall data is now available up to the end of March 2013, please clickadobe icon Rainfall [170kb] .  The rainfall for February 2013 was quite low with only 37.8mm recorded, which is 20mm below the average recorded for February.  For March 2013, 67.6mm of rain was recorded, which is 19mm above the average recorded for March.  Although March was wetter than average, the rainfall recorded over the last two months has been closer to average rainfall levels.  With April appearing to be relatively dry so far, the ground conditions needed to carry out the ground investigations are becoming more favourable.  It is therefore likely that these works will now be able to commence shortly.


  • January 2013 was another wet month with a further 96.6 mm of rainfall recorded by the rain gauge located at Naish Holiday Village (see adobe icon Rainfall [170kb] ).  Consequently, the ground investigations are still on hold until weather conditions become dry enough to allow the works to progress.  Unfortunately, these works are unlikely to commence until April 2013 at the earliest.
  • There have recently been a number of cliff failures between Hoskin's Gap and Sea Road.  One of these failures (identified on 6 Feb 2013) is located adjacent to Marine Drive car park (west of the shops).  Due to the on-going instability at this location, a row of car parking places has had to be temporarily closed off in case of further failure at this location and to prevent excessive loading of the cliff from vehicles parked in these bays.  There is currently no public access into the fenced off area and the council apologise for the inconvenience this may cause.


Barton slip

  • December 2012 was another very wet month with a further 135mm of rainfall recorded by the rain gauge located at Naish Holiday Village (see adobe icon Rainfall [170kb]), bringing the total rainfall for the year to 975mm. 
  • Consequently, the ground investigations have been put on hold until weather conditions become dry enough to allow the works to progress.
  • An article in today's Lymington Times (dated 5 January 2013) has also reported on these developments.


  • adobe icon This map [5Mb] indicates the area of undercliff that is closed to the public (shown in blue).  The area is closed because it is an active landslide area and the recent wet weather has made the soft ground very unstable.  This year we have had significant amounts of rainfall with the last three months being particularly wet (75mm September, 120mm October and 117mm November).  Together with the high rates in April, June and July, this resulted in a landslide happening around the 28 November 2012 within the closed off area.  Rainfall over the last few days has now meant that December will also be a very wet month, so the ground will continue to be unstable and there is a high risk of further landslides occurring, especially in the closed section of undercliff.  For your own safety, please refrain from entering the closed areas.
  • Please be aware that as mudslides have blocked the lower tracks at Barton on Sea, there is NO ACCESS from Highcliffe through to Barton on Sea.  Please also be advised that there are tidal conditions to be aware of when using the beach in front of Naish Farm. Thank you.


  • New cliff closure signs are now being put up to inform people of the area of undercliff which is now closed due to continued ground movement and instability.  Please click to view the adobe icon safety sign [178kb]

Barton slip


  • Following recent high levels of rain in September, October and November, the risk of ground instability is now very high.  Large cliff failures have occurred in the closed section of undercliff and these are likely to continue over the winter period.  In the interest of safety, please take note of the signs and do not enter the areas which are closed.  Thank you.


  • Barton on Sea desk study report and geophysics trial report added to reports section.
  • Article on forthcoming ground investigations reported upon in this week's Lymington Times (dated 17/11/12).

  • Information posters are now displayed at a number of locations along the Barton on Sea frontage.
  • Stakeholder engagement letters are due to be delivered to residents along Marine Drive, Marine Drive East and Marine Drive West on 14/11/12.
Updated: 5 Sep 2018
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