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Past Year Questions: Design of Sewers and Sewerage System | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE) PDF Download

Q1: A system of seven river segments is shown in the schematic diagram. The R1's, Q1's and Ci's (i = 1 to 7)are the river segments, their corresponding flow rates, and concentrations of a conservative pollutant, respectively. Assume complete mixing at the intersections, no additional water loss or gain in the system and steady state condition. Give Q1 =5m3/s; Q2 = 15 m3/s; Q4m3/s; Q6 = 8m3/s; C1= 8kg/m3; C2 = 12 kg/m3; C6 = 10kg/m3. What is the steady state concentration in kg/m3 , rounded off to two decimal place) of the pollutant in the river segment 7 ? ____    [2023, Set-2]
Past Year Questions: Design of Sewers and Sewerage System | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)Ans: (10.58 to 10.78)
Sol: 
Past Year Questions: Design of Sewers and Sewerage System | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

At 1-1, for R3
Q3 = Q1 + Q2
=5+15=20 m2/sec
Past Year Questions: Design of Sewers and Sewerage System | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)= 11 Kg/m3
At 3-3 for R 7
Q7 = Q6 + Q5 = 17 + 8 = 25 m 3/ sec
Past Year Questions: Design of Sewers and Sewerage System | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)Answer : 10.6 kg/m3 .

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FAQs on Past Year Questions: Design of Sewers and Sewerage System - Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)

1. What are the primary factors to consider in the design of a sewer system?
Ans. The primary factors to consider in the design of a sewer system include the expected population density, wastewater flow rates, material selection for pipes, the gradient of the sewer line, potential for infiltration and inflow, environmental impact, and local regulations and standards.
2. How do you determine the capacity of a sewer?
Ans. The capacity of a sewer can be determined by calculating the peak flow rates expected from the contributing area, considering factors such as population density, daily water usage, and any industrial discharges. Hydraulic calculations using Manning's equation or other formulas can help assess the sewer's ability to handle these flows without overflow or backflow.
3. What is the difference between a combined sewer and a separate sewer system?
Ans. A combined sewer system collects both sewage and stormwater in a single pipe, which can lead to overflow during heavy rainfall. In contrast, a separate sewer system has distinct pipes for sewage and stormwater, reducing the risk of overflow and allowing for more effective treatment of wastewater.
4. What are the common materials used for sewer pipes and their advantages?
Ans. Common materials used for sewer pipes include PVC, ductile iron, and concrete. PVC pipes are lightweight, resistant to corrosion, and easy to install. Ductile iron pipes are strong and durable, suitable for high-pressure applications. Concrete pipes are robust and have a long lifespan, making them ideal for large diameter sewers.
5. What maintenance practices are essential for a sewerage system?
Ans. Essential maintenance practices for a sewerage system include regular inspection and cleaning of sewer lines, monitoring for blockages and leaks, maintaining lift stations and pumping systems, and managing stormwater drainage to prevent overload. Preventive maintenance helps ensure the efficiency and longevity of the sewer system.

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