Groundwater monitoring underpins administration of the Nice Fen



Great-Fen
The Nice Fen stretches between Peterborough and Huntngdon, and comprises many farms and villages, in addition to two nationwide nature reserves.

Securing a sustainable future for the Nice Fen relies upon, in lots of respects, upon restoration derived from managing water ranges. Wendy Pressure from OTT HydroMet explains how a monitoring programme helps to attain the bold targets which were set for this nationally vital fen panorama.

Strolling by the Nice Fen, watching Chinese language water deer grazing within the distance, while a raven calls close by and a pair of buzzards hover within the rising warmth, guests could possibly be forgiven for considering that they’re surrounded by a pure setting untouched by human palms. Nonetheless, as Henry Stanier, Wildlife Belief Monitoring and Analysis Officer, explains; “Nothing could possibly be farther from the reality; human exercise, largely pushed by agriculture, has centered totally on water ranges, and this has had a profound impact on the native ecology.”

In 2001, 5 organisations got here collectively to set out a imaginative and prescient for the Nice Fen, with the goal of offering a extra sustainable future for the realm. In lots of respects, this work focuses on restoration by managing water ranges, so a community of monitoring wells has been established.

The realm can also be the main target of a habitat restoration undertaking involving the native Wildlife Belief, Pure England, the Atmosphere Company, Huntingdonshire District Council and the Center Degree Commissioners. Two nationally vital nature reserves are situated there: Holme Fen and Woodwalton Fen.

The Nice Fen covers 14 sq. miles of land that’s being restored to wild fen over a 50-100 12 months timescale, creating an enormous nature restoration community, offering a Dwelling Panorama for fenland species together with threatened fen wildlife, comparable to bitterns and otters. A mosaic of various wetland habitats has been established to assist all kinds of wildlife, comparable to dragonflies, butterflies and amphibians. This habitat can also be appropriate for flowers and different crops, a few of that are discovered virtually nowhere else within the UK, such because the Fen violet and the Fen woodrush.

In 1630 a gaggle of rich landowners, headed by the Earl of Bedford, got down to drain the fens for agriculture and to minimise winter flooding. Most of the native individuals had been fiercely against the draining, believing it could deprive them of their conventional technique of livelihood from wildfowling, fishing and reed reducing, and a gaggle referred to as the ‘Fen Tigers’ vandalised the dykes, ditches, sluices and reedbeds. However, by the top of the seventeenth Century the drainage undertaking was full.

This drainage trigger extra issues, comparable to peat shrinkage, and extra drainage initiatives adopted. Within the 1800s, acutely aware of the probably shrinking impact of draining the peaty soil round Whittlesea Mere, William Wells, and different rich landowners, instigated the burial of a measurement publish at Holme Fen, which was anchored within the bedrock and reduce off on the soil floor. Immediately, round 4 metres of the publish is exhibiting above floor, recording the bottom subsidence since 1852. The bottom stage at Holme Submit is now 2.75 metres beneath sea stage – one of many lowest land factors in Nice Britain.

A number of points have arisen on account of the drainage. Firstly, there was a big impact in native ecology and biodiversity with the loss of a giant space of wetland. Additionally, as the bottom stage subsided it grew to become much less sustainable to pump water up into the primary drain. The lack of peat has develop into a serious concern, as a result of, as a carbon sink, peat is vastly necessary within the struggle towards international warming.

Peat types in waterlogged, acidic situations when layers of partially decomposed mosses and different lavatory crops accumulate. The method may be very gradual; it may possibly take as much as 1,000 years to kind only one meter of peat. However, round 60% of the world’s wetlands are made from peat. The crops which kind peat seize carbon dioxide from the ambiance and in consequence, giant portions of carbon are trapped within the peat. Nonetheless, if the peat is drained, it decomposes a lot sooner; releasing the saved carbon. Peat burning has the identical impact, however a lot sooner.

It has been estimated that the discount of peat loss within the Nice Fen, coupled with the capturing of carbon by vegetation is saving 325,000 tonnes of CO2 from being launched annually.

The undertaking can also be a great instance of pure flood administration (NFM) as a result of it offers additional water storage after heavy rainfall, which slows water stream and helps to guard surrounding cities, villages and farmland from the chance of flooding.

Water stage administration
The drainage of the fens incurred widespread ecological hurt, however the resolution is considerably extra sophisticated than merely elevating water ranges to create wetlands. Henry Stanier explains: “There are a variety of things that affect the restoration course of. Firstly, the geology of the realm is sort of a layer cake, and every layer has completely different hydrological properties. Secondly, the Nice Fen consists of numerous business farms, so you will need to perceive and handle their groundwater standing. Thirdly, the floor water requirement varies in keeping with the time of 12 months, because of the wants of all kinds of natural world, together with breeding birds. Fourthly, together with numerous companions, we’re conducting quite a few analysis applications, most of that are affected by water stage. For instance, we have now trial plots with raised water ranges, through which we’re investigating the efficiency of various plant species. These embrace Sphagnum or ‘lavatory moss’ which shops water, prevents the decay of useless plant materials and finally types peat, and we’re additionally trialling the wetland cropping potential of Glyceria fluitans, a sturdy perennial aquatic candy grass.”

Great-Fen-groundwater-well
A groundwater effectively.

Water stage monitoring
Working with a workforce of over 60 volunteers Henry delivers a monitoring program for the undertaking space, which is at the moment round 3,700 Hectares. 40 wells have been put in in strategic areas, every to a depth of round 5 metres. 37 of those have OTT Orpheus Mini water stage loggers, which file groundwater stage each hour, each day of the 12 months. Henry collects the information from these loggers a couple of times per 12 months, or extra steadily the place the information is of higher significance.

Three of the wells have been fitted with OTT ecoLog water stage loggers. These units have the flexibility to transmit each saved and reside information to a safe web site which Henry can entry with any internet-enabled system at any time, and from wherever. “It is a super benefit,” he explains. “With such a big space to cowl, discipline visits might be time-consuming and subsequently pricey, so we set up the OTT ecoLogs within the wells of biggest curiosity, in order that we are able to, for instance, view the consequences on groundwater ranges once we switch floor water into an space.”

Henry’s workforce operates numerous trial plots by the dipwells; investigating how the vegetation is altering. His workforce additionally correlates groundwater ranges with vegetation progress, in an effort to higher perceive optimum rising situations.

The Nice Fen space consists of numerous business farms, which function each drainage and irrigation processes, so the groundwater monitoring program additionally helps to grasp the consequences of those actions. As well as, new farms are often acquired and integrated into the Nice Fen, so the monitoring work helps to handle the restoration of this land from agriculture to fenland.

Abstract
Henry says: “Fenland restoration relies upon closely on a deep understanding of the geology and the water desk, and the consequences of water standing on the native ecology. The water stage monitoring that we undertake offers the information that underpins the science that informs the necessary administration selections which can be made. The standard and reliability of the OTT water stage loggers is subsequently very important, and we stay up for increasing our community of displays because the undertaking continues to develop.”



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