Friday 28 December 2012

Water levels up and down the Kennet Valley

With 2012 drawing to a close, and the national media full of articles and images reporting flooding around the country or warning of worse to come, the Kennet Valley has continued to produce high river flow rates and the River Kennet has over-spilled it's banks at a number of locations.

The upper reaches of the River Kennet

It's not often that the upper reach of River Kennet provides sufficient levels for paddling, but access to the water and around obstacles in the water course limit its potential.

The view from West Overton Bridge on Boxing Day was almost identical to that recorded a month ago at this location.

Downstream at Marlborough, the weir below Pewsey Road Bridge is the site of the EA gauging station.  Although levels were falling when this photo was taken after a Christmas Day high of 0.48m (the typical river level range for this location is between 0.04m and 0.37metres), at the time of writing today the river was still sitting at 0.43m.

From the northern slope of the Kennet Valley between Stitchcombe and Axford, where the River Kennet was out of its banks on the 26th December.

The river was already lapping over the fisherman's footpath downstream from Ramsbury bridge on Christmas Eve, whilst the extensive flooding of downstream fields from Knighton could be easily seen from the B4192.  The Knighton main river gauge is currently reading 0.61m (the more usual river level range for this location is between 0.08m and 0.43m).

At the broad bridge at Lackbridge Cottage below Littlecote the gauge marker was running out of numbers on the 26th.

The middle reaches of River Kennet

With limited access to the River Kennet along much of the middle reach inhibiting paddling, the riverine loop from Benham Weir provides the potential to detour away from the Kennet & Avon Canal all the way down to Newbury.

The left hand sluice by the old WW2 defence emplacement (be careful if walking here as the concrete base is being undercut and is gradually collapsing) is open for business...

...which has noticeably raised the river pool level, making an easy descent down the shortened main weir face...

...before proceeding downstream.  Note the sluice outflow cuts across the river and recirculates against the left bank before flowing away.

The river level was raised to the extent that it was overlapping the bank opposite the weir, and was sufficiently high on Boxing Day to submerge the end of the fish ladder and hide the steel bar that is located between the concrete arms at the bottom of the ladder.

For more images of what might be expected downstream from Benham Weir see the description from halfway down the post titled "The middle reach of River Kennet", but note that this was written in late 2009 (ignore the December 2008 date) and that river conditions may have changed.

It's also worth noting that with many flooded areas on the approach to Marsh Benham it's worth taking extra care on the roads.

 Milkhouse Lane, travelling back to the A4 from the Marsh Benham put-in.

The lower reaches of the River Kennet

Newbury's Victoria Sluices have been opened to help maintain the Navigation cut levels.

The Padworth to Ufton run has been demonstrating high flow rates and high water levels.  All of the following images were taken yesterday.

The gauge at Padworth Bridge showed the increase over the already high levels from 11 days previously.

Upstream from the bridge towards Padworth Mill on the public footpath, the river level has breached the bank top.

The view downstream from the put-in just above the bridge on the left bank.  It's still possible to pass under the bridge but watch your head.

Once beyond Padworth Bridge it's just a question of keeping to the river course, avoiding trees...

...and other well hidden hazards.

The River Kennet at bank full levels and beyond at Padworth.  These conditions continue down to Ufton bridge.

Once at Ufton the current water level may require portaging around the road bridge (unless you have a squirt boat perhaps), which, looking back upstream, begs the question how this tree debris got underneath.

Still further downstream at the Sulhamstead loop, there are also some interesting conditions.

Sulhamstead Weir hiding its collection of potentially lethal anti-scour rocks with fast flowing water...

...which has raised the level of this section to the height of the bank by the public footpath river left below the weir for an easy put-in.

The usual tree-fall hazards are avoidable with care.

Draper's Osier Bed Stream has enough water to go without scraping the bed at present, but mind your head and be aware of the upright angle iron embedded right in the centre of the middle channel.

Once below the weir a new willow tree-fall hazard from the right bank should be passable to the left, but watch out for other trees and branches as there is little room for manoeuvre once beyond the weir pool.

There's also an old footbridge framework not long before you reach Station Road bridge (unless it's been removed - this image is from 2009)...

...and with the water at this height - here shown looking upstream from the Station Road bridge - passage under the bridge itself might be blocked. 

Once back to the Kennet above Barbel Bar, be aware that the water flowing down from Shenfield Mill is at a very high level; note the submerged decking in this image.

Once through to Barbel Bar, you'll probably find that a reasonable playwave has returned.  Although almost washed out yesterday, the EA gauge shows that levels are now dropping.

Wednesday 26 December 2012

Eddington Bridge, Hungerford hazard to paddlers

For paddlers making the most of the unusually high water levels to explore sections of the River Kennet that are normally too shallow to navigate without risking criticism on the basis of environmental damage, please be aware of the potential danger from the old strands of barbed wire on the upstream side of Eddington Bridge at Hungerford.

The first picture below is a scan of a postcard sent in 1963 (although the date of the actual photograph is not clear).

At the time that this photograph was taken at Eddington Bridge there does not seem to have been a perceived risk of anything passing underneath the arches.

More recent experience of the River Kennet, as it broadens before passing under the A4, has meant that there has often been insufficient water levels to guarantee hull clearance.

In November 2011 the drought then affecting the Kennet meant that you could have walked through the the eastern-most arch whilst barely wetting your feet.

The gauge at Eddington Bridge at that time marked the fact that there was only a few centimetres of water depth across the breadth of the river.  The 2011 images also illustrate that, at some point in time since the '1963' photograph, someone had felt it necessary to install steel stanchions to support twin strands of barbed wire.

The current level of the River Kennet at Hungerford (and elsewhere on the upper and middle reaches) provides a satisfactory depth to avoid contact with the river bed when paddling.  However, should you decide to do so, you may wish to consider rapid disentanglement strategies.

The stanchions and the wire have clearly not been maintained, but should anyone attempt to paddle this section at the current levels, the wire may constitute a serious risk to health and safety.

Sunday 16 December 2012

Christmas paddling on the River Kennet

For those lucky enough to have some time off over Christmas, the lower River Kennet is looking likely to be in good form for paddling on it's riverine loops and detours, but the raised water levels are combined with a large number of potentially dangerous tree falls.

The BBC weather forecast for Newbury is currently predicting heavy rain on Wednesday 19th and Thursday 20th, with light rain anticipated daily from Friday right through into Christmas Day, the following Tuesday.  Taken with the ground water levels lying in the saturated valley, river levels are like to remain in the upper quartile of their normal range, if not well above in certain locations.

A quick tour of potential holiday paddle points illustrates what might be found.

Padworth to Ufton.

The gauge above Padworth Bridge shows that there is plenty of water in the run down to Ufton.
The River below the bridge was running deep and wide today.

Easy to put in just above the bridge river left where the overhead power lines mean that there shouldn't be any conflicting use by anglers.

Sulhamstead loop.

Sulhamstead Weir was helping to balance raised levels on the canalised sections of the Kennet Navigation last weekend.  Remember that if you decide not to portage, you'll have even less headroom under the footbridge, less time to pick a route, and limited visibility of the anti-scour boulders that lie beneath the weir.

Downstream of the weir, the island was disappearing rapidly.  The main channel flow is river left (next to the public footpath),...

...but you'll need to go river right as the Kennet turns sharply right below the weir to avoid this solid obstruction.

View from upstream, left bank.

View from upstream, left bank.
 
View from upstream, left bank. Other tree falls further down this section have been partially cleared of debris by the recent flow rates and are negotiable, but there is less time to pick your line due to the flow rate.
 
Southcote loop.
 
This section is now more accessible as the height of the weir pool has significantly increased by comparison to normal levels, but there are significant strainers along this section.
 
At more usual levels the narrow public footpath to the right of Southcote sluice weir requires caution to prevent falling over the bank (image from 2008)...
 
...but today the water was over the footpath, which would provide any easy put in to this section.
 
The normal choice of channels is normally fairly obvious but current water levels have produced a range of increased 'options' (head river left below the weir pool for the main flow)...
 
 
 
 
...and beware of the multitude of potential strainers.  After the first few tree obstacles where the footpath above the right hand bank remains inaccessable, the heightened river level provides for easier portage options.

Saturday 24 November 2012

Upper Kennet flood risk reality

At 15:07 today the Environment Agency's website flood warning status for the River Kennet and its tributaries from Berwick Bassett down to Newbury stated

"The river and flooding forecast is as follows:  River levels on the River Kennet have now fallen and the river remains in its banks in all locations.  The river remains sensitive to further rainfall.  This may cause the river to spill out into the floodplain.  No property flooding is currently expected.  The weather prospects are: There is further heavy rain forecast for Saturday afternoon through to the early hours of Sunday morning.  The rest of Sunday will be mainly dry."

The view on the ground is somewhat different.

The upper Kennet looking upstream at Overton Bridge...

...and, turning to the right, the water spreading out to the back of The Bell pub on the A4.

The Kennet at George Bridge (also looking back upstream).

The EA river gauge at Pewsey Road Bridge in Marlborough reported levels at the upper limit of the Kennet's normal range this morning...

...but just downstream the water was lapping over at the back of Town Mill a couple of hours later.

Below Marlborough at Stitchcombe, locals are anticipating that the current levels flowing through the sluice weir...

...will raise the weir pool river to a height that may breach property (note the wall in the extreme right in image)...

...and are preparing for the worst.