When drainage to sewage ratio is 20, the peak dry weather flow is
A. 20% of the design discharge
B. Slightly less than 5% of the design discharge
C. Slightly more than 5% of the design discharge
D. None of these
Answer: Option B
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Qd/Qs = 20.
Qd = 20 Is ---- (1).
In rainy weather;
Q = Qd+ Qs.
from eq (1)-
Q = 21 Qs ----- (2).
In peak dry weather;
Q= Qd + Qs (here Qd = 0 since no storm water).
Hence,
Q= Is ----- (3).
From ek (2) & (3).
Dry weather condition/ Rainy weather condition = (Qs/ 21Qs)*100 = 4.76...
Therefore, the peak dry weather flow is slightly less than 5% of the design discharge.
Qd/Qs = 20.
Qd = 20 Is ---- (1).
In rainy weather;
Q = Qd+ Qs.
from eq (1)-
Q = 21 Qs ----- (2).
In peak dry weather;
Q= Qd + Qs (here Qd = 0 since no storm water).
Hence,
Q= Is ----- (3).
From ek (2) & (3).
Dry weather condition/ Rainy weather condition = (Qs/ 21Qs)*100 = 4.76...
Therefore, the peak dry weather flow is slightly less than 5% of the design discharge.