In a city of population 2 Lakhs, the average per capita water demand i...
About 80% of the water supplied in the city enters in the Sewer.
Average discharge through the Sewer
QAvg = 0.25 m3/sec
QDesign = 3 × QAvg
QDesign = 3 × 0.25 = 0.75 m3/sec
QDesign = 0.75 m3/sec
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In a city of population 2 Lakhs, the average per capita water demand i...
Calculation of Design Discharge through Branch Sewer
Given:
Population of the city = 2 Lakhs
Average per capita water demand = 135 L/c/day
Sewer is designed to carry 3 times the average discharge
80% of the water supplied in the city enters the sewer
To find:
Design discharge (m3/s) through the branch sewer
Solution:
1. Calculation of Total Water Demand
Total water demand = Population * Average per capita water demand
= 2,00,000 * 135 L/c/day
= 27,00,00,000 L/day
2. Calculation of Water Entering the Sewer
Water entering the sewer = 80% of Total water demand
= 0.8 * 27,00,00,000 L/day
= 21,60,00,000 L/day
3. Calculation of Average Discharge
Average discharge = Water entering the sewer / 24 hours
= 21,60,00,000 L/day / 24 hours
= 90,00,000 L/hour
4. Calculation of Design Discharge
Design discharge = 3 * Average discharge
= 3 * 90,00,000 L/hour
= 2,70,00,000 L/hour
= 2,70,00,000/3600 m3/s
= 0.75 m3/s
Therefore, the design discharge through the branch sewer is 0.75 m3/s.
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