Clevedon Marine Lake will be closed… Sunday 20th to Saturday 26th October 2019

Clevedon Marine Lake will be drained down and remain empty next week, to allow for its autumn programme of maintenance work including dredging mud and silt from the lakebed that has accumulated since its renovation and reopening in 2015.  Mud clearance in the main lake will be undertaken annually over future years to minimise build up.

When the model boat lake was last cleared out in September 2017, a mini digger shifted an estimated 16 tonnes of silt in just one day.  That volume alone had settled over 9 months – the equivalent to 250 black bin liners full of mud!

The lake should fully refill during the first high tide on Sunday 27th October at 6am, and be usable between 9am and 5pm, avoiding overtopping tides that day.

Next week’s schedule is as follows:

Sunday, 20th October Lake drain from 10am. Litter picking and evacuation of lakebed, 2pm – 6pm.
Monday, 21st – Friday, 25th October Lake empty for digger access, silt clearance and cleaning of lake surrounds.
Saturday, 26th October from 6pm Lake refill which continues during Sunday, 27th October with two overtops from 5am and 5pm.

 

Do your bit for water quality

Clevedon Marine Lake is a much-loved community asset.  Lake users can follow six simple steps to help keep the water quality good in the lake:

  • No dogs lakeside.
  • Use the public toilets next to the arcade.
  • Use crabbing bait like bacon sparingly and clean up any scraps.
  • Not swim when unwell.
  • Use the drinking tap and freshwater shower adjacent to HM Coastguard Clevedon rescue station.
  • Drop £1 in one of the donation boxes every visit, to help pay for water quality testing and lake care.

During the warm summer months, when the lake is heavily used, the water quality in Clevedon Marine Lake is sampled before and after each series of overtopping tides (approximately those over 12.5m) to provide a baseline health check.  The test results are shared to allow lake users to make an informed decision about entering the water.

Poor bathing water quality test results occur from time to time.  The causes include:

  • A prolonged warm spell. Although UV in sunlight kills off harmful bacteria, it is only effective at surface level where the light can penetrate.
  • Heavy usage stirring up sediment from the lakebed.
  • Heavy rainfall causing run-off into the Severn Estuary, entering the lake on overtopping tides.
  • Contamination from human or dog waste.

Clevedon Marine lake is a semi-natural environment.  It is a living space filled by sea water from the Severn Estuary.  Faecal coliforms are present all around us and inside us.  They live in our gut.  Mammals (including humans), fish and birds produce them all the time.  Faecal coliform bacteria can enter aquatic environments through direct discharge of waste from these species, from agricultural and urban storm runoff, and from human sewage.

There is a year-round ‘NO DOGS’ order in place at Clevedon Marine Lake and the splash pool for public health protection, to reduce the risk of unfriendly bacteria draining into the lake.  A single gram of dog waste can contain millions of faecal coliform bacteria, known to cause cramps, diarrhoea, intestinal illness, and serious kidney disorders in humans.  Faecal coliform bacteria can also present as eye or ear infections.

Updates on the water quality in Clevedon Marine Lake are shared here.  If a poor result is reported, it is recommended that the public do not swim in the lake until the water has refreshed and been retested.  People may choose to use the lake at their own risk in the meantime.  Any swimmers doing so are advised to wear ear plugs and goggles to protect against infection.  All visitors having contact with the lake water are advised to wash hands before eating.

In addition, the water quality in the Severn Estuary, which refills the lake, is monitored regularly by the Environment Agency throughout May to September, with samples taken from Clevedon Beach adjacent to Clevedon Marine Lake.  Poor water quality warnings are issued on-line – and the most recent water quality test results also can be checked.

 

Splashing out on the splash pool

From Monday 11th to 20th March, Clevedon Marine Lake will be partially drained to enable contractors to access the inner lake wall to install an inlet valve in the splash pool wall – timed to avoid overtopping tides.  The splash pool area will be fenced off for the week from 10th March.  As the water level will be lowered, the lake will also be unavailable to users.  The lake should refill on Tuesday 19th March at around 6pm.

The new drain works for the splash pool, costing over £4,000, will make sluicing and maintenance of the splash pool a lot easier for volunteers – as it normally requires pressure washers and electric pumps to clean it thoroughly.  In future, thanks to this project, the same will be achieved using the sea wall valve to drain the pool and the lake wall valve to let water in to flush everything through.  The investment will be well worthwhile, also enabling youngsters to enjoy good, clean fun every time they visit the splash pool.

There’s lots to do from Sunday afternoon on March 10th until March 19th, in terms of litter picking, muscle work and site management, so if you can spare any time to help out, please contact volunteer@marlens.org.uk

Ship shape and Bristol fashion

Ship shape and Bristol fashion

The Marlens’ technical team have been kept busy around Clevedon Marine Lake during the winter months doing lots of essential maintenance and repair work as well as installing new facilities such as the concrete benches and donation boxes. As Lake Day approaches on Saturday 24th March, the pace will pick up to ensure everything’s ship shape to kick start lake season.

Alan Wilson, who heads up all things technical at the lake, fills us in:

The Lake doesn’t exactly care for itself! There will be litter picking sessions occurring with increasing frequency over the next few weeks. As the weather improves, and spring is anticipated, we will have more visitors to the lake and that inevitably generates more work for us!

On 10th March we will be carrying out the first deep clean of the season in the splash pools.  We stop the water entering the pool, drain it and then pressure wash it to remove silt and any algae. We’re currently exploring a paint treatment for the bottom of the splash pools to help reduce any build up. 

On 17th March we will replace the flags on the upper promenade (supplied by North Somerset Council) and put the splash pool hand pump back in place.

If we can get a few dry days without seawater lapping over the lake edges, we will also be painting new ‘NO DIVING’ notices around the lake border. The donation boxes will also go back up over the next few weeks following the initial vandal attack.

Subject to funding being available, we will also try to get more concrete plinth benches in place this year.

De-silting the lake bed has been deferred until late autumn to avoid draining the lake during peak season.

Any volunteers or BLOG readers with useful DIY skills are welcome to join our technical team. We can always use more help! 

To offer help or enquire about 2018 lake maintenance and improvement projects, please contact info@clevedonmarinelake.co.uk  To keep up-to-date on all lake news, follow us on Facebook

Alan Wilson, 26th February 2018