The minimum recommended diameter of sewers, is

In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is

Clogging of sewers, is caused due to

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

A nuisance is experienced in diluting water if dilution factor is less than

If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

Dilution method of disposing off sewage, is not preferred to

The most dangerous pollutant in vehicular emissions is

The sewage is pumped up

The rate of accumulation of sludge in septic tanks is recommended as

To maintain aerobic biological activity, the moisture content of the compost mass should be about

Flocculated particles do not change their

Sewer pipes need be checked for

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is