1. BSI (British Standards Institution) (2012) BS EN 13508-1:2012. Investigation and assessment of drain and sewer systems outside buildings – General requirements. BSI, London, UK.
2. BSI (2014) BS ISO 55000:2014. Asset management – Overview, principles and terminology. BSI, London, UK.
3. BSI (2017a) BS EN 752:2017. Drain and sewer systems outside buildings – Sewer system management. BSI, London, UK.
4. BSI (2017b) BS ISO 24516-3:2017. Guidelines for the management of assets of water supply and wastewater systems – Wastewater collection networks. BSI, London, UK.