The frequency of cleaning of slow sand filters is 1-3 months, hence is the typical duration of operation. Filtration rate for design is taken as
100−200 l/hr/m2. Operation cost is low since it is worked over by gravity and no other energy source is required.
The minimum density (g/cc) of corrugated and semi-corrugated asbestos cement sheets considered acceptable for construction purposes by the Indian standard is:
The actual discharge of liquid through an orifice is determined by multiplying ideal discharge by a factor called coefficient of discharge. The coefficient of discharge is given by __________.
