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Frequently Asked Questions

Topic: Sustainable Drainage

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• Describe the differences between the 2 rainwater harvesting kits?
• How can a Waterloc installation be designed to provide access to the inlet pipe and allow inspection of the soakaway?
• How much storage capacity do the rainwater harvesting kits provide, in M3 and litres?
• It is recommended that an infiltration system is installed at least 1m above ground water table level. Why is this?
• There is a 1:3650 chance of a 10 year storm happening tomorrow. How is this probability arrived at?
• What are the maximum flow rates for water entry using the different methods?
• What does the acronym SUDS stand for?
• What is minimum distance between a building and an infiltration installation?
• What is PPG25?
• What is the difference between infiltration and attenuation?
• What is the difference between the CIRIA and BRE methods of hydraulic design of an infiltration system?
• What is the function of the solenoid valve supplied with the USW200 rainwater harvesting kit?
• What is the key advantage of the Marley rainwater harvesting system?
• What is the minimum cover above the Waterloc cells for areas subject to vehicular traffic?
• What is the recommended material for a) Bedding? b) Side/backfill?
• What is the recommended maximum installation depth for: a) Waterloc? b) Waterloc HD?
• What part of the Building Regulations relates to SUDS?
• What recommendation should be given regarding the depth of attenuation systems relative to ground water level?
• What storm return period is required, according to the Building Regulations for the design of infiltration systems?
• What types of fabric/material are/is used with: a) an infiltration system? b) an attenuation system?
• What’s the main principle of SUDS?
• When designing attenuation systems for greenfield sites, what is the maximum allowable discharge rate generally required by the Environment Agency?
• Why should cell connectors be used?