5 Wetlands Habitat Action Plan
A Biodiversity Action Plan for Hertfordshire < Return to contents page 5 Wetlands habitat action plan 5.1 Wetland habitats 5.1.1 Summary channel but also for the influence they exert, from spring source to floodplain, on the plants and animals The term ‘wetland’ covers a diverse range of of adjacent habitats. Unconstrained rivers spill onto habitats. Within Hertfordshire alone this includes floodplains and inundate habitats on a regular basis, rivers, streams, springs, water-cress beds, ponds, allowing the development of wet grassland, marsh, lakes, reservoirs, sewage works, marshes, fens, swamp, fen and carr woodland. These natural swamps, wet grassland and carr woodland. These functions of river systems bring huge benefits to wetlands are hugely important for both wildlife human society. and people. Many of the wetlands of Hertfordshire, especially open waters, have been created by human However, few rivers have not been physically altered activity. In fact, all wetlands within the county have by human activities. Engineering works with the aim of been influenced by human activities to some degree. reducing problem flooding or improving land drainage In many cases this is due to the range of benefits they can also have serious adverse environmental effects, have provided. Over the centuries wetlands have leading to degradation both of the main channel and supplied food, drinking water, power, transport and adjacent habitats. Such works tend to hydrologically leisure opportunities as well as their natural purifying isolate the river from its floodplain habitats. Rivers and flow regulating functions. relatively unaffected by these activities are a particularly valuable wildlife resource. All wetlands are characterised by the presence of water; static or flowing.
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