Water Filtration Works

acre per day aeration algæ Altona alumina amount of sediment Antwerp apparatus average bacteria bacterial efficiency beds bottom capacity cent chemical cleaning clogging coagulant concrete construction cost covered filters Cyanide Process depth designed discharge drains economical effect effluent Engineering experiments feet fill-and-draw method filter plants filter-bed filtered water filtered-water reservoir float flow gallons per acre gravel gravity groined arches Hamburg inches intake Lawrence Experiment Station layer loss of head Louis Manual masonry Materials Mechanics million gallons morocco necessary number of bacteria operation organic matter orifice outlet particles pipe placed PLATE practice Pressure Filter protection pumping purification rapid sand-filters rate of filtration raw water regulating removal river roof Rudolph Hering sand grains scraping sediment settling basins sewage slopes slow sand-filters Somersworth storage streams subsidence supply surface suspended matter thickness tion Treatise turbidity typhoid fever underdrains valve velocity wash-water washing water-supply