from showers and thunderstorms at this time of year. Average rainfall is around 800–900 mm (31–35 in). About 8–15 days of snowfall is typical. November to March have the highest mean wind speeds, with June to August having the lightest; the prevailing wind direction is from the south-west. Midsomer Norton flood alleviation scheme For many years, the centre of Midsomer Norton was prone to flooding. Sometimes several times a year, the Somer rose up during prolonged rainfall and flooded shops, particularly where the high street is at its lowest point in the middle between Martin's newsagent and the former Palladium cinema. To prevent future deluges, a major flood alleviation tunnel — completed in 1977 – was constructed beneath the high street to remove excess water when the town centre was threatened with flooding. The infrastructure comprises a sluice gate situated at the top of the high street near Somervale School through which the water is carried under the town via a pre-cast concrete culvert several metres in diameter to an outlet further downstream at Rackvernal. Since it began operation, no flooding has occurred to the high street and an Environment Agency report confirms that the relief scheme remains in good condition and continues to serve to its 100-year standard. Despite the success of the scheme, some outlying areas of the town are now rated at increased risk of flooding from Wellow Brook due to climate change and the increased provision of housing in the vicinity. In 2008 a new monitoring station was installed at nearby Welton through which data on water pressure and flood levels can be collected via metal tubes placed in the river linked to a telemetry box. This facility is now providing the Environment Agency with extremely useful information for use in future assessments of flood risk. Industry and commerce For hundreds of years mining was an important industry for the area, and there were a number of mines in Midsomer Norton, e.g. Old Mills, Norton Hill, and Welton. However the seams were thin and with the hilly nature around, not easily worked. Generations of miners who worked in the difficult conditions of the local collieries are remembered at the Radstock Museum. The coming of the railways, particularly the Bath extension of the Somerset and Dorset Joint Railway (S&D) in 1874, transformed the conveyance of coal out of the area. The last pit in the town, at