Passing water through sand beds (slow sand and rapid sand filters) to trap impurities.
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Population forecasting techniques, including arithmetical, geometrical, and incremental increase methods. Passing water through sand beds (slow sand and
Water Supply Engineering Authors: Dr. B.C. Punmia, Ashok K. Jain, Arun K. Jain Publisher: Laxmi Publications Ashok K. Jain