Ain designing a setting tank the control design parameter is

A)in designing a setting tank the control design parameter is ?

1-depth
2- detention time
3- percent removal on suspended solids
4- flow rate
5- percent removal of BOD

B) a basic assumption of rational method for determining peak runoff from watershed

1) occurs if rainfall duration is equal to or grateer than the time of concentration
2)independent of rainfall intensity
3) occurse if rainfall area increase as drinage decrease
4- occurs if rainfall duration leaa than time of concentration

Solution

A)in designing a setting tank the control design parameter is ?

Ans-1)depth ( because while designing settling tank detention time is calculated by depth)

B) a basic assumption of rational method for determining peak runoff from watershed

Ans-1) occurs if rainfall duration is equal to or grateer than the time of concentration (because When using the Rational Method, the rainfall duration used to determine intensity should typically equal the time of concentration of the drainage area.)