Skip to main content
Feb 26, 2016 / Haseeb Jamal -

5 Travel Myths You Need to Stop Believing Right Now

Feb 26, 2016 / Haseeb Jamal -

Canal Comes Alive with Lighted Boat Parade.

Design of Sanitary Sewer - Solved Example # 2

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 Slope (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 (qw)

= P * Return flow (%) * q
  = 5000 * 0.7 * 400
  = 1,400,000 lpcd
  = 0.0162 m3/sec

Let take peaking factor (P.F)

= 3

Peak Hourly Waste Water Flow

= 3 * 0.0162
  = 0.0486 m3/sec
Now finding the diameter of sewer pipe line

Using discharge formula;

Q = AV

0.0162 = (\frac{\Pi }{4}D2) (\frac{1}{n} R2/3 S1/2)

D = 0.264 m (264mm or 10.40”)

Use 12” Dia pipe

Checking the minimum self cleaning velocity

V = ( \frac{1}{n} R2/3 S1/2 ) Where R = (D/4)2/3 for circular pipe

V = 0.96 m/sec

Vmin = 0.6 m/sec < V = 0.96 m/sec < Vmax = 2.5 m/sec

PART 2

Doubling the slope i.e. 2 S = 0.01

Q = ( \frac{\Pi }{4} D2) ( \frac{1}{n} R2/3 S1/2)

Q = 0.0331 (m3/s)

Q = P * qw

P = Q/qw Where qw = Return flow (%) * q (= 280 lpcd )

P = \frac{2,860,429.78}{280} \frac{(Liters/Day)}{(Liters/Capita/Day)}

P = 10,216 Persons

So, if the slop is doubled then total of 10,216 extra persons can be served.

Comments

preyasi Jun 27, 2019

Wishing you the best of luck for all your blogging efforts.This is my first opportunity to chat this website. I found some interesting things and I will apply to the development of my blog.
best engineering college in punjab
top engineering college in chandigarh

samuelddarden Jul 01, 2019

The information and facts talked about within the post are a few of the most effective obtainable.  free fire garena

preyasi Jul 09, 2019

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.
top school in greater noida
premium school in greater noida

burtblart Jul 21, 2019

Something you don't normally think about. good article!

https://bugbros.com/

preyasi Jul 24, 2019

Apple products are revered for its quality, precision and great design. SRSG started its operations as Apple technology partners in the year 1997.
apple reseller in guwahati
apple authorized service center in delhi
FM Channel License

Denis01 Aug 01, 2019

I really like your article.  It’s evident that you have a lot knowledge on this topic.  Your points are well made and relatable.Thanks for writing engaging and interesting material. happy wheels

Subscribe to our Newsletter

Stay informed - subscribe to our newsletter.
The subscriber's email address.

Search AboutCivil

Related Civil-Engg. Content