At last! MPs are beginning to get the message about HS2. According to yesterday’s Observer:

I’m coming to like the idea of beavers. And no, I don’t mean those, I mean the animated furry kind. Oh maybe not that either … the animals what build dams in rivers, m’lud.
I used not to think much of these animals, but research seems to be showing that they really do have a beneficial effect on water management, otherwise known as flood control.
And beavers are back on the agenda (well, maybe) because a large part of southern England is under water thanks to a record breaking deluge over the last 2-3 months. December and January rainfall has been the heaviest in England and Wales since records began 240 years ago — and it looks as if February is about to join them.
According to New Scientist the rains have been exacerbated by the weather in Indonesia and the tropical west Pacific — no I don’t get that either but then I’m not a meteorologist. But regardless, we’ve had several oceans of rain recently and consequently there is much flooding in southern England.
There is an argument going on about whether rivers were dredged sufficiently, and whether if they were it would have made any difference. On the one side we appear to have the UK government who say rivers must be dredged more and they’ll pay — mainly because they’re trying to appease agribusiness. On the other hand every hydrologist being quoted is saying dredging would, at best, have made no difference and would likely have made things worse.

“Dredging of river channels does not prevent flooding during extreme river flows … The concept of dredging to prevent extreme flooding is equivalent to trying to squeeze the volume of water held by a floodplain within the volume of water held in the river channel. Since the floodplain volume is usually many times larger than the channel volume, the concept becomes a major engineering project and a major environmental change.”

He then says:

Is that not bleeding obvious? A river’s capacity is tiny by comparison to the catchment from which it draws its water. You can increase the flow of a river by dredging, but that is likely to cause faster and more dangerous floods downstream when the water hits the nearest urban bridge … If you cut it off from its floodplain by turning it into a deep trench, you might raise its capacity from, say, 2% of the water moving through the catchment to 4%. You will have solved nothing while creating a host of new problems.
Among these problems, the Environment Agency points out, are:
1. Massive expense. Once you have started dredging, “it must be repeated after every extreme flood, as the river silts up again”.
2. More dangerous rivers: “Removing river bank vegetation such as trees and shrubs decreases bank stability and increases erosion and siltation.”
3. The destabilisation of bridges, weirs, culverts and river walls, whose foundations are undermined by deepening the channel: “If the river channels are dredged and structures are not realigned, ‘Pinch Points’ at structures would occur. This would increase the risk of flooding at the structure.” That means more expense and more danger.
4. Destruction of the natural world: “Removing gravel from river beds by dredging leads to the loss of spawning grounds for fish, and can cause loss of some species. Removing river bank soils disturbs the habitat of river bank fauna such as otters and water voles.”

Yep, that’s right: dredging is a tool for improving navigation not land drainage. If you want to prevent flooding you need to do things like:

• More trees and bogs in the uplands — reconnecting rivers with their floodplains in places where it is safe to flood …
• Making those floodplains rougher by planting trees and other deep vegetation to help hold back the water — lowering the banks and de-canalising the upper reaches, allowing rivers once more to create meanders and braids and oxbow lakes. These trap the load they carry and sap much of their destructive energy.

So how should all this be done?
Well one answer appears to be beavers!

Beaver are considered to be a ‘key-stone’ species because they have the ability to create and maintain wetlands by building dams and digging ditches. They also create coppice, selectively felled areas of woodland. In doing this they provide essential habitat for many other species of plant and animal. Wetland areas and coppice must currently be maintained artificially, at significant cost to the public. Beaver damming activity has also been observed to filter pollutants out of the water, leaving streams cleaner.
Wetlands are … fragile ecosystems, but they can also act as a flood defence and could protect homes across the country. After heavy rainfall, wetland areas and flood plains act as a sponge, holding excess water and releasing it slowly, preventing sudden rises in water level and flash floods …
Beavers have been reintroduced across Europe, and have not caused any serious ecological problems. Reintroductions have been extremely successful as long as the population density is low enough that the beavers do not come into conflict with human activity.

There’s a fuller report, by Natural England and People’s Trust for Endangered Species, on reintroducing beavers to England here.
Sure, beavers likely aren’t going to do a lot of good actually on the Somerset Levels. But they will help if they are present on the uplands which drain into the Levels. One of the keys seems to be the need to manage water flow much higher up the valleys than the actual areas currently being flooded.
But of course that’s counter-intuitive both to the affected residents and to politicians. And of course neither trusts the experts who they employ. If you’re not going to listen to experts — insisting instead on a DIY fuck-up — then don’t waste money employing them.
So the bottom line is we need to reintroduce beavers.
What a great idea!
Meanwhile I’ll leave you with George Monbiot’s final salvo:

Cameron’s dredge pledge is like the badger cull. It is useless. It is counter-productive. But it keeps the farmers happy and allows the government to be seen to be doing something: something decisive and muscular and visible. And that, in these dismal times, appears to be all that counts.

FFS what sort of madman can even start to think that new trees are equivalent to ancient woodland. Just for a start the biodiversity is completely different.

Ancient woodlands could be cut down under ‘biodiversity offsetting’ proposal

So who should be most in favour of HS2, the proposed high-speed rail connection from London to Birmingham and the north?
Well if it is as essential to the economy as we are told it is, business should be lobbying hard in its favour.
Are they? … No, they are not!

Businesses know value for money when they see it, and our research shows that they don’t see it in the Government’s case for HS2 … The IoD cannot support the Government’s current economic case for HS2 … We agree with the need for key infrastructure spending, but the business case for HS2 simply is not there. The money would be far better spent elsewhere and in a way that will benefit much more of the country. Investment in the West and East Coast main lines, combined with a variety of other infrastructure projects, would be a far more sensible option.
[Simon Walker, IoD Director-General]

Interestingly there was another report in the Telegraph last December (which I had not previously picked up) exposing the fact that the projected passenger numbers also do not stack up with the business case.
Hurrah for some common sense! I’ve been saying this since HS2 was first mooted. Cynically I’d say that HS2 is the rail industry willy-waving and indulging in self-aggrandisement to distract from the fact that is hasn’t/can’t sort out the current rail infrastructure and get that working efficiently — something which should cost a lot less than the currently projected £50billion price tag for HS2. Let’s sort out what we have first and then see if we still need such a massive, environmentally and financially destructive project as HS2.
And anyway, in the current economic climate, do we really have this amount of money to throw around?