Sanitary Sewer Design Example # 1
Problem Statement
Design a sanitary sewer to serve a population of 5,000 people, if the average consumption is 400 liters per capita per day (lpcd). How many extra persons can be served if the slope is doubled? Using "n" value of 0.013 in the Manning's formula & the return flow as 70%. Check the minimum self-cleaning velocity. Neglect infiltration & inflow?
Given Data: | |
Population (P) |
= 5000 Persons |
Average water consumption (q) |
= 400 lpcd |
Manning Coefficient (n) |
= 0.013 |
Return Flow |
= 70 % |
Assume Slop (s) |
= 0.005 |
Required: |
1. Find the Velocity (V) =? Also check minimum self cleaning velocity |
2. When the slope is doubled find the extra population to be served =? |
Solution: |
||
PART 1 | ||
Average waste water flow (q_{w}) |
= P * Return flow (%) * q | |
= 5000 * 0.7 * 400 | ||
= 1,400,000 lpcd | ||
= 0.0162 m^{3}/sec | ||
Let take peaking factor (P.F) |
= 3 | |
Peak Hourly Waste Water Flow |
= 3 * 0.0162 | |
= 0.0486 m^{3}/sec | ||
Now finding the diameter of sewer pipe line |
||
Using discharge formula; |
||
Q = AV |
||
0.0162 = ( D^{2}) ( R^{2/3} S^{1/2}) |
||
D = 0.264 m (264mm or 10.40”) |
||
Use 12” Dia pipe |
||
Checking the minimum self cleaning velocity |
||
V = ( R^{2/3} S^{1/2}) Where R = (D/4)^{2/3} -------- for circular pipe |
||
V = 0.96 m/sec |
||
V_{min} = 0.6 m/sec < V = 0.96 m/sec < V_{max} = 2.5 m/sec |
||
PART 2 | ||
Doubling the slope i.e. 2 S = 0.01 |
||
Q = ( D^{2}) ( R^{2/3} S^{1/2}) |
||
Q = 0.0331 (m^{3}/s) |
||
Q = P * q_{w} |
||
P = Q/q_{w }Where q_{w} = Return flow (%) * q (= 280 lpcd ) |
||
P = |
||
P = 10,216 Persons |
So, if the slop is doubled then total of 10,216 extra persons can be served.
Comments
Nice blog
Nice blog, the article you have shared is good.This article is very useful. My friend suggest me to use this blog.
mba college in chandigarh
cgc placement
Our academic
Our academic pursuits, along with a range of extracurricular activities, help in honing a child's skills and ensuring that he/she grows to be a mature and responsible citizen.
best school in greater noida
google
google
This example is better than…
This example is better than all the other examples that you've shared with us on this website. I wish you can tell us about the assignmentmasters.co.uk reviews website now. I would appreciate that more than anything in the world.
This sewer design is unique,…
This sewer design is unique, and I like it a lot. Can you show us a design where you focus on the main aspects of real money pokies game in New Zealand? I have asked some friends here in New Zealand to do this, but they haven't replied to me yet.
We are known
We are known for our quality of support and customer service. This high quality support is delivered through our regional and branch offices across the country.
apple authorized service center in kolkata
macbook pro reseller in mumbai
apple reseller in Kolkata