Extract from the Eden District Council Strategic Flood Risk Assessment with added Environment Agency mapping information
The River South Tyne flows to the north and west of the village of Garrigill. Environment Agency Flood Zone modelling shows that Flood Zones 2 (medium probability of river flooding) and 3a (high probability) both extend into the village area. If this map does not show your area, use the search facility.
© Ordnance Survey and the Environment Agency
The dark blue line shows the main rivers; these are usually larger streams and rivers.
Light blue shading shows the area that could be affected by flooding from rivers, if there were no flood defences. This area could be flooded from a river by a flood that has a 1 per cent (1 in 100) or greater chance of happening each year. (For planning and development purposes, this is the same as Flood Zone 3.)
Light green shading shows the additional extent of an extreme flood from rivers. These outlying areas are likely to be affected by a major flood, with up to a 0.1 per cent (1 in 1000) chance of occurring each year. (For planning and development purposes, this is the same as Flood Zone 2.)
Where there is no blue shading, this shows the area where flooding from rivers and the sea is very unlikely. There is less than a 0.1 per cent (1 in 1000) chance of flooding occurring each year. The majority of England and Wales falls within this area. (For planning and development purposes, this is the same as Flood Zone 1.)
There are numerous minor watercourses in and around Garrigill that flow into the River South Tyne. Any development in and around this village could be at risk from flooding from these watercourses. No modelling being available for these smaller watercourses, any development within the village would require an assessment of the level of fluvial flood risk.
The risk of flooding from surface water runoff is highest in areas where there is a combination of steep topography and impermeable surfaces. Garrigill is located at the base of a steeply sloping valley which is noted as having an impermeable superficial geology (clay silts and sands). Consequently, there is a high potential for surface water flooding at this location. The risk of flooding from surface water runoff should be considered as part of any planning application.
A review of the OS maps shows that there are numerous wells and springs within the vicinity of the village. This is indicative of high water levels within the underlying geological stratum. The solid geology of the area is a carboniferous limestone which may be indicative of an aquifer containing relatively high volumes of groundwater. Future development should therefore consider the risk of groundwater flooding.