GATE 2014
At a site,
based on percolation test, the allowable rate of treated sewage application was
determined as 65 L/m2/day. The effective depth (m) of a soak pit
with a diameter of 2.5 m for the disposal of 1020 L/day of septic tank effluent
is ______________
Answer: 1.98 to 2.02
Soln:
Let the depth of cylindrical pit be ‘h’ and
radius = 1.25 m (given)
Total surface area for absorption= πr2
+ 2πrh
= πr (r + 2h)
Total absorbed effluent= πr (r +
2h) ×1020
= 3.14× 1.25(1.25 + 2h) = 1020
Solving it, h= 2m
No comments:
Post a Comment