Total Discharge Head (hd) : The reading of a pressure gauge at the discharge of the pump, converted to meters (feet) of liquid, and referred to datum, plus the velocity head at the point of gauge attachment
NFPA 20 Standard for the Installation of Stationary Pumps for Fire Protection, 2007 ed. http://www.saltech.co.il/_Uploads/dbsAttachedFiles /NFPA_20.pdf, (Std: Instll of Stnry Pumps for Fr Prac - Amer) {188 NFC}