hazard classification is a statement of the most realistic adverse impact on human life and downstream developments should a designated dam fail. Hazard classification is used as a tool for prioritizing program activities, allocating resources for accomplishment of objectives, and scheduling safety of dams reassessments. See high hazard, low hazard, and significant hazard. Haul distance. The distance measured along the center line or most direct practical route between the center of the mass of excavation and the center of mass of the fill as finally placed. It is the distance material is moved. Average haul is the average distance a grading material is moved from cut to fill. See overhaul. Hardness. A characteristic of water determined by the levels of calcium and magnesium. Water hardness is largely the result of geological formations of the water source. Public acceptance of hardness varies. Hardness of more than mg/l as calcium carbonate is considered excessive for a public water supply and results in high soap consumption as well as objectional scale in heating vessels and pipes, and sometimes causes objectionable tastes in drinking water. Many consumers object to
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