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Waste Water Engineering
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When drainage to sewage ratio is 20, the peak dry weather flow is

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Correct Answer: Option B
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2 Comments
Atif Muneer
Atif Muneer 5 years ago
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.
Priyanshi Thakur
Priyanshi Thakur 5 years ago
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.