In addition to the flows in the standard mode of operation, the PHC facility has the ability to manage surge capacity during incidents such as disease outbreaks, extreme weather events or natural disasters, where the site is required to deal with far greater numbers of patients. The open space around the main building is crucial in providing space to erect temporary shelters on-site to manage the increased numbers. Covered spaces at the end of the ward wings typically used for gathering or family spaces can be set up as surge triage points to feed the temporary spaces. Vehicles can access this zone via the ambulance entry, and reach the back of the site where space is also provided for temporary containerized support spaces. Additional water supply at the rear of the site also services patient care in this area.