1 the ratio of maximum water demand to average water demand

1)- the ratio of maximum water demand to average water demand is 
a) peak factor
b) fire fighting demand factor 
c) critical flow factor
d) design flow factor

2)-a two stage airobitic design factor is used to treat a combined primary and secondary stage the hydraulic detention time is
a) less than solid retention time
b) greater than solid retention time
c) equal tosolid retention time
d) not important in design

Solution

1) Option D is correct. Maximum water demand to average water demand is design flow factor. This represents the fluctuations in water demands. Sewers or water pipes are designed for both the demands.