(1) Water flows, including rivers, canals, etc., to keep the center width of the water at the center depth. At the checkpoint, except bacteria, total coliform and fecal coliform bacteria. Keep at a depth of 30 cm at a checkpoint.
(2) Still water such as lakes, marshes, reservoirs, etc., shall be at a depth of 1 meter at a checkpoint for water with a depth greater than 2 meters and so on collected at the midpoint depth of monitoring points for water with a depth of less than 2 meters. unless the bacteria total coliform and fecal coliform bacteria. Keep at a depth of 30 cm at a checkpoint.