Naylor Industries plc   Naylor Drainage Limited   Naylor Concrete Products Ltd   Naylor Gardenware ABOUT NAYLOR DRAINAGE LOCATIONS LINKS NEWS GET IN CONTACT METROCELL Attenuation Infiltration Structural Design Criteria Installation & Maintenance METRODRAIN METROTUNNEL Domestic Soakaway Installation NAYLOR PAVING SYSTEM Installation Accessories RAINWATER HARVESTING LEGISLATION BROCHURE MetroCell - Structural Design Criteria The following information is offered as general guidance. Project designers and qualified engineers should be engaged to guarantee and ensure both hydraulic and structural design of infiltration and attenuation systems. Due to their strength and versatility, MetroCell units are suitable for both light and heavy duty eg: Landscape areas, back gardens, light traffic areas and also heavy traffic areas (contact the Naylor Technical Department for specific advice) Guidance Tables for minimum cover: Minimum Cover Depths Domestic Garden Landscape Light Traffic Area <2,500kg Car Parks Vehicle >2.500kg Heavy Traffic Vehicle Minimum Cover over Units 0.5m 0.5m 0.6m 0.75m 1m LOW WATER TABLE Maximum Installation Depth - Structures with groundwater over 1m below base of units   Stiff Clay (London Clay) Silty Sandy Clay (made ground) Loose sand and gravel Medium Dense sand and gravel Dense sand and gravel Shear Resistance of Soil 24º 26º 29º 33º 38º Landscape Loading 2.7m 2.9m 3.35m 3.7m 4.75m Car Loading 2.5m 2.75m 3.2m 3.5m 4.6m HGV Loading Suitable for HGV loading, design is specific to frequency and type of loading. HIGH WATER TABLE Maximum Installation Depth - Attenuation structures, groundwater at 1m below ground level   Stiff Clay (London Clay) Silty Sandy Clay (made ground) Loose sand and gravel Medium Dense sand and gravel Dense sand and gravel Shear Resistance of Soil 24º 26º 29º 33º 38º Landscape Loading 1.9m 2.0m 2.2m 2.4m 2.65m Car Loading 1.8m 1.9m 2.1m 2.3m 2.5m HGV Loading Suitable for HGV loading, design is specific to frequency and type of loading. NB the tables are for guidance only. Car park usage includes for occasional refuse vehicles. Reference should be made to a chartered geotechnical engineer to confirm angle of shear resistance. For HGV use and specific advice outside the above please refer to Naylor Drainage technical department. Home: News : Contact : Sitemap Website produced by Red: Copyright © 2006 Naylor Industries plc All Rights Reserved.