Environmental Engineering

A. contains pathogenic bacteria
B. consists of undesirable substances rendering it unfit for drinking and domestic use
C. is safe and suitable for drinking and domestic use
D. is contaminated

A. more depth
B. less depth
C. more discharge
D. less discharge

A. air relief valve
B. reflux valve
C. pressure relief valve
D. sluice valve

A. at a distance R from the well
B. close to the well
C. at a distance R/2 from the well
D. none of the above
where R is the radius of influence