Climate As part of the United Kingdom, the Holderness area generally has cool summers and relatively mild winters. The latitude of the area means that it is influenced by predominantly westerly winds with depressions and their associated fronts, bringing with them unsettled and windy weather, particularly in winter. The wind sometimes causes depositions to happen. Between depressions there are often small mobile
anticyclones that bring periods of fair weather. In winter anticyclones bring cold dry weather. In summer the anticyclones tend to bring dry settled conditions which can lead to drought. For its latitude this area is mild in winter and cooler in summer due to the influence of the
Gulf Stream in the northern Atlantic Ocean. Air temperature varies on a daily and seasonal basis. The temperature is usually lower at night and January is the coldest time of the year. The two dominant influences on the climate of the Holderness are the shelter against the worst of the moist westerly winds provided firstly by the
Pennines and then the Yorkshire Wolds and the proximity of the North Sea. Generally, rainfall is 600 to 700 mm per year which is low compared with the national average rainfall of 1125 mm.
Geology and topography Geologically, Holderness is underlain by
Cretaceous chalk but in most places it is so deeply buried beneath glacial deposits that it has no influence on the landscape. The landscape is dominated by deposits of till, boulder clays and glacial lake clays. These were deposited during the
Devensian glaciation. The glacial deposits form a more or less continuous lowland plain which has some peat filled depressions (known locally as meres) which mark the presence of former lake beds. There are other glacial landscape features such as
drumlin mounds, ridges and kettle holes scattered throughout the area. The well-drained glacial deposits provide fertile soils that can support intensive arable cultivation. Fields are generally large and bounded by drainage ditches. There is very little woodland in the area and this leads to a landscape that is essentially rural but very flat and exposed. The coast is subject to rapid marine erosion.
Erosion The Holderness coastline suffers the highest rate of
coastal erosion in Europe: a year on average or 2 million tonnes of material a year. Some of this is transported by
longshore drift with about three percent of material being deposited at
Spurn Point spit, to the south. The growth of Spurn Point is demonstrated by a series of
lighthouses that have been built on the point. It is thought that approximately of land has been lost since the
Roman era, including at least 23 towns/villages, including
Ravenspurn. The Holderness coastline is susceptible to erosion due to the long north-easterly fetch, allowing for powerful waves, and the softness of the geology that make up the cliffs. Holderness is also a former bay that was filled in during the
ice age and is now made up of
chalk/glacial compounds that are easily eroded such as
boulder clay. All the villages affected by the erosion are located on the north side of the
Humber estuary. The area stretches from
Flamborough Head (high chalk cliffs, just north of Bridlington) down to
Spurn Point (sand spit, on above map). Villages such as Ravenser, which sent representatives to the parliament of
Edward I, have totally disappeared. The local authorities are endeavouring to prevent the effects of erosion.
Hard defences in the form of a concrete seawall and timber groynes have given some protection. It has been suggested that a large underwater reef made of
tyres could be built off the Holderness coast to mitigate this erosion, but it would be costly to build. Other defences include sea walls,
groynes, and
gabions but business people say that if the erosion is not stopped then there will be millions of pounds of damage. However, one or more such groynes has had a detrimental effect further along the coast, in some areas resulting in erosion of up to per year initially, though over the long term erosion rates have been seen to revert to their original yearly average of closer to a year.
Drainage The Holderness area is drained by the
River Hull and its tributaries and a number of coastal streams. The valley of the River Hull is broad and shallow and in its lower reaches the river is contained within flood banks. The River Hull Tidal Surge Barrier at the mouth of the river can be used to prevent surge tides overwhelming the flood defences. Large areas of Holderness are too flat and low to drain naturally so in these areas a low level drainage system operates to collect the water. In the middle and lower reaches of the River Hull water is pumped from the low level drains into a high level system. This system consists of elevated water courses bounded by embankments. It drains by gravity into the sea. The main drain is the
Holderness Drain, begun in 1764 by the engineer
John Grundy Jr. In the east and south-east of Holderness there is a complex network of drains and streams that flow south into the Humber or east into the North Sea. To mitigate the effects of high tides stopping the water flow from these outlets, several have had pumping stations constructed at their outfalls. ==Natural history==