A property plumbing system comprises the supply of water to a home or building that is clean and usable to supply fixtures throughout the home including a hot water system that then provides heated water to showers, toilets, tap fixtures and outlets in bathroom, laundry and kitchen areas.  This water supply once passed through these fixtures then enters what is known as the sewerage and/or drainage system. This needs to be removed from the property by way of common effluent to council infrastructure or through septic tanks and soakage trenches that are common in outer metro areas. The water and drainage must comply with Australian Standards for things like pipe sizing, correct falls, water pressure and health and safety to ensure occupants are not using dirty water supply, have insufficient or incorrect drainage and are provided with adequate water for the house requirements.  Gas components in the house or property also carry their own standards that must be adhered to, with town gas supply or mains being provided and regulated through a gas meter the property gas line then supplies fixtures and appliances like, gas heaters, cooktops, hot water systems and bbq’s. With a home or building comes a roof that collects water from rainfall, this is then removed or stored through rainwater tanks and utilised where possible for gardens and limited water fixtures in the home like toilets or laundry sinks. This is a separate system to the sewer and must remain separate for requirements set by Australian Standards to prevent surging and over supply to sewer systems during a rainfall. The sizing for the stormwater system is calculated to allow sufficient flow and removal of the rain to ensure nothing floods or falls back into the property causing damages. There are different types and methods of retaining and using rainfall for the benefit of the property that a plumber can identify and discuss.