This project was carried out by the Society of Fire Protection Engineers (SFPE) and was supported by the Department of Homeland Security's (DHS's) Science and Technology Directorate and the United States Fire Administration (USFA). SFPE is an engineering association for advancing the science and practice of fire protection engineering. Water supply is an important subject to the fire service, fire protection engineers, and city managers. These manuals (volumes I & II) are intended to provide a reference for concepts and terminology to facilitate communication and understanding among these organizations.