Problem Solved: Flow Rate Formula - Water Treatment, Distribution and Wastewater Math

American Water College Presents - Problem Solved!
This is the solution to a typical flow rate problem, found on state certification exams. It is also an important calculation for water treatment, distribution system and wastewater treatment operators.
americanwaterco...

[@AmericanWaterCollege]

Thank you for your comment. Using the numbers from the problem, the common equivalent 7.48 gal/cubic ft and the formula for the area of a circle as 0.785 x D x D, the answer works out to be 7,046.16 gpm which we rounded to 7,046 gpm. If you solve for the cross-sectional area of the pipe using the formula A = π x r x r , the answer works out to be 7049.73 gpm which would round to 7050 gpm. (π in this calculation came from the pi button on the calculator) I hope this clears up any confusion

[@hm4ahmeth993]

American Water College plz how did u get 7,046 gpm can u explain

[@tyronemckinley2016]

Thank you very much for explaining it clearly.

[@feztoys]

Omg I was converting gpm to ft/s and spent like 2hrs trying to figure out what I did wrong. Found this video. And as soon as you said to convert the inches to ft for the diameter it clicked lol thank you. Go my answer correct now.

[@andyradin7992]

What an arcane formula for area of a circle! It's Pie-R-squared! Taught in every middle school in the world!

[@kingofkong510]

This is starting to make sense. Thank you

[@michaelgreene2817]

The area of a circle (cross section of a round pipe) is pi * radius-squared, which is the same as pi * diameter-squared / 4 (radius-squared = [diameter/2]-squared = diameter-squared / 4)

[@2Allanmr]

The 0,785 is (Pi/4) as the formula is (pi*D^2)/4, its actually same as pi*r^2, just a different way to express

[@MasterCivilEngineering]

Step by step solution videos

[@juanmanuelespinoza4309]

the large treatment plant in texas can treat 500 mgd and uses 15 % bleach for disinfection.the bleach has a specific gravity of 1.25. at maximum flow rate, how many gallons of bleach will be used per day of the effluent demand is 7.0 mg/l and 1.0 mg/l residual is required

[@CivilTech696]

Sir I have question. I have a multi storey building which contains 80 people and they use 200 gallons of water per person per day. For them how do I calculate the required diameter of sewerage pipe?

[@sweeyong7756]

Area of circle is it not pi (3.14) x r2? I looked up online. Can you explain why area is calculated using 0.785xdxd?

[@richarddenny3897]

Was very informative . Thank you for your time.

[@siguenciajulio]

This helped me out for my pharmacy technician test 😆

[@zaina9828]

is there any youtube for water supply subject ?

[@coreyform563]

please explain where you get the .785 from. is this a standard

[@gosula.amaralingeswararao8698]

Tqs sir ur explanation is good

[@jeremyfort2259]

You have to make it make sense where are you getting the other numbers like the A=0.785

[@aishysharif2442]

Can i ask what mathematics concept is used in this?

[@asyo27]

i want to know how much valve opening with respect to the flowrate of tank to optimized backwashing and rinsing

[@ziajaanbazsohailkhan4293]

Pls. can you explain from where did you get 0.785

[@brandonflores2331]

Where are you getting 0.785 from?

[@seanneeley8133]

.785 is one quarter or pi or 3.14. So there are 2 formulas you can you use to figure area of a circle. 1) pi r2 or 3.14 times radius time radius or 2) diameter time diameter times .785. Hope this helps.

[@cheerdiver]

@@seanneeley8133 .785 expresses Pi/4, as the equation is commonly expressed Pi(D^2)/4 As opposed to 4/3(D^3)Pi, area of a sphere. Double a liner measurement, 2^1=2 Double the Diameter of a pipe (or sides of a sq), the area increases 2^2=4 Double the Diameter of a sphere (or sides of a cube) the volume increases 2^3=8

[@saruulbayarbatkhuyag6047]

Is there any formula to calculate a wear rate of slurry pipeline? it does not matter what kind of material the pipe is made and what velocity it has. I have some information about the thickness in mm according to the clock position.

[@ranasaleem6792]

If velocity is not given, only head of liquid and diameter of pipe is available. Then how can be calculated flow.

[@dinehkumar8053800869]

Sir, Please tell me, How to calculate, In a pipeline, how much water will be discharged in one hour from a 10 mm hole. If the pipeline has a pressure of 10Kg / cm2.

[@trishamcmillan8171]

I'm a bit confused about the flow rate formula. Why do you divide Pi by 4 for this equation?

[@Sheshe661972]

Good question.

[@sachinchakravarthys1807]

For deep well (250feet) 5HP 8 stage 3 phase submersible Motor pump under 220v what is the pump impeller size and specifications to give out the water at high pressure and is it impeller size proportional to high pressure water out . Pipe size 2 inch and also high discharge rate that is LPM is same the so called pressure

[@deantaylor5177]

The Imperial Measurement System makes this problem more difficult. Why do some people use it again?

[@bmag2653]

Wow... the 3.14 thing is making me thing "pie" which is round, which tricks the brain into thinking it's a default part in equation even those not more than 2x2ft

[@omaribrahim9271]

This will save me points. thank you!

[@leewade9798]

Thank you!

[@phoebelovecandano5103]

Is flow rate and flow weighted average somehow the same in solving wastewater? I'm just confused.

[@TheStealx5]

question i went to school on this and was taught to use ,7854 so which one is it cause in my watertreatment class he mark me wrong because of the 4 and i have a final on monday for this class!

[@MasterCivilEngineering]

Step by step solution videos

[@kroisen]

Why are you using a funky formula for area, instead of pie-r- squared, showing that r= 1 ft? That's so much more reasonable and it ties in with what everyone learned about the area of a circle!

[@abhisheksangam4078]

Kathi Roisen s

[@Flee-the-matrix]

Kathi Roisen I don't like the pie formula it's harder for me

[@ivanpadilla9875]

3.14x1= 3.14 squared, its the same but obviously for pie for you use 1x1 you use half the diameter, and for .785 you use the entire diameter.. eaither way works

[@sgm4324]

Dear sir thankyou so much to guide me

[@MR-nl8xr]

Simple & great!

[@lawrencesand1693]

sir which one consume more energy a 1hp. or a 2 hp. (horsepower) both going to fill up a 21 gallon pressure tank.?

[@plumbercanicon1524]

2 horse power because that double means 1492 watts. 1.5 horsepower for booster pump.

[@axelroseenimes2880]

Sir can you please explain, where you can get the 0.785 is it the constant no?thank you...

[@benweber1191]

.7854 is the diameter of a 1 inch circle

[@benweber1191]

I'm sorry it is the area of a 1 inch circle not diameter

[@samuraiNishant]

please folk i have a question for u ..............Q- a source of water supply to a town on a hill is under investigation and following data are being considered: population - 2 lakh , water demand - 200lpcd, height of point of inlet to water works above the lowest water level in the source- 30m , friction and minor losses in the intake pipe system to be around 4 m, efficiency of pump- 80%, duration of pumping- 20 hrs/day, flow velocity through pipe- to be about 1.0 m/sec. Determine the size of rising main and the horse power of the pump required .

[@abdusalamkrim6651]

hi..I want to know how can I calculate the flowing in the pump and compreesoren of HM 299 PC

[@jonathanrivera218]

What is velocity the pipe 3/4 please help me please

[@salmanp2580]

Amazing!

[@tmz90]

I hope anyone can help me out, im applying for a water plant operator which requires type d licence. How do i get this license?

[@dragonmaster8314]

Where do he got the 7.48?

[@varnoclarke3600]

What do I do to get the diameter of the pipe?

[@NetSkillNavigator]

Where did u get 0.785 in area?

[@nirmalneyyal6308]

Ex. Total discharge is 965.3cumsec . Then how to convert to cusec this value

[@rajrupalisarkar1961]

plz ans me the lengths of stream use by map rotameter

[@jstang34]

what about when you have a 10inch pipe, or a pipe smaller than 1 foot diameter

[@Waterworks77]

jstang34 divide by 12..12 representing a foot.

[@johnlyons1119]

jstang34 convert measurements

[@giyau4999]

Pipe area isn’t equal to (pi)(r)(r)? Why (0.785)(D)(D)?

[@cskfanclub198]

But how to calculate velocity water in pipes

[@pirytorres1814]

I cant find a video for. Weir overflow rate

[@MasterCivilEngineering]

Step by step solution videos here

[@ashwathnarayana986]

nice video and useful

[@cavemanstone323]

what is the flow rate in 6 inch diameter pipe in gallons per minute (gpm) if the flow velocity is 1.2 feet per second? can anyone help me with that?

[@saraism4557]

Put the same formula Q=V*A

[@plumbercanicon1524]

Thank you sir for lecture. To those who confused, they are displacement about the factor of conversation.

[@yoshiomaki1517]

Hi Sir, the factor 0.785 in the formula came from 3.14159 / 4？

[@benweber1191]

.7854 is the area of a 1 inch dia.circlr

[@kamalahamed8586]

Genius

[@jackkkozzlovsky4372]

LOL that slide through though!!! lmao!!!!

[@andrewly8623]

How to this problem

[@cskfanclub198]

And how to know velicity

[@downesboat1]

you should us a davidson pie to do the math it is easyer

[@Kaleemkhanpatafi]

Good

[@aftabhussain5496]

Nice sir

[@abidsaleemdesconian3528]

125.93 gpm water, plz recheck your cal.

[@tejashivinimonikasri3e153]

❤

[@madderubasavaraja5596]

How come A 0.785 sir

[@nirmalneyyal6308]

How to convert cumsec to cusec.

[@venkatanarayana706]

Tnq u

[@rajputrajatbaba4774]

Why we use .785 -

[@angdejes2870]

joke equation

[@arun4846]

👍

[@thelordlopez5134]

yeah thaks man

[@kanaklatasinaganiya4173]

Mathematics manna achcha samjhao ki hamare practical se jivan mein samajh sake aur hamare exam mein sahi number

[@melissamoore6539]

ffs america.... why don't we use the metic system. Its so so so so so much easier.

[@samuraiNishant]

yes

[@UliSwag]

I agree. 'Merica being individuals

[@mgtowbooboo8530]

For the same reason we cut parts of babies penisus off. Because we are fucked up.

[@sekarkrishnan713]

You are right

[@38Achilles]

All of our car parts are metric, you know its difficult to count to 10.

[@daverabideau1075]

I took the 15.7 and multiplied it by 7.48 and then multiplied that number by 60 for seconds in a minute. 7,046 gpm. Why do any of the cancelation stuff? It convolutes the entire equation. I thought mathmaticians were always classified as lazy lol

[@swagchadd6925]

Bro i have no idea why i chose to take this class i ain’t understanding ANY of this

[@bgrajen]

answer is 117.4 Gal per min

[@vamnews]

Rajendra Bg They are correct, you must of made a error along the way. Do it on paper to check your answer.

[@wendyjg123]

Where is the 0.785 coming from?

[@vijayshankarpandey2063]

Pipe diameter =[ pi ÷4 ]Diameter squere.

[@juanmanuelespinoza4309]

How can solve this problem 👇

[@jayjanuary4357]

All paying attention yet?

[@bluecavemen]

I hate math. Is this what I expect to do on the test is arithmetic with math like this?

[@กิตติพลขาวงาม]

กิตติพล ขาวงาม

[@wtfMYRONL]

'Merica still using Imperial lol

[@UliSwag]

we should use metric honestly. so much simpler.

[@fwandersson9328]

Why are you not using SI-units? This is just stupid.. Get a grip to follow the development of the world. Please

[@jhunudey960]

hindi translate

[@jamesgraham7390]

Can't see the calculations under neath the hearing impaired shit!!

[@itsChristinaJ]

7,049 gpm not 7,046

[@aishysharif2442]

Can i ask what mathematics concept is used in this?

[@josefreja7649]

can you explain where did u get 0.785? thanks...

[@GuitarMan1117a]

GuitarMan1117a sorry the right hand side of the 3rd line should be (3.14/4)*d*d

[@arthercasillas2755]

0.785 is the factor of a circle. 0.785 is used instead of pi,(or pi,r,squared).

[@GuitarMan1117a]

The equation for area is A= PI * R^2 . R=D/2 so the equation becomes A= PI *(( D^2)/4). PI=3.1415... PI/4= 0.785