How to Calculate Grade, Fall, and Length for the Trades Person. Inches per foot, percent, and ratio

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I go over how to calculate grade given length and fall. Also the differences between inches per foot, percent grade, and slope as a ratio. I show how to do these problems on the whiteboard and also with a level and what the second line on the level is for. Help for trade exam, especially for the plumber's exam. How to calculate grade.
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Пікірлер: 61

  • @denisewhite478
    @denisewhite4785 ай бұрын

    Ty Ty Ty. You have saved me a lot of aggravation. Plus you didn’t make me feel like a total idiot😊

  • @ColfaxMath

    @ColfaxMath

    5 ай бұрын

    Glad to hear it, good luck

  • @davidbarber5356
    @davidbarber5356 Жыл бұрын

    You are great, explaining it so anyone can understand your math. Thank you so much.

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Great to hear, thank you

  • @readplanet23
    @readplanet232 жыл бұрын

    Thank You sir for the educational video. I have been a fan of Trigonometry for many years. Keep up the good work. Have A Good Day!

  • @ColfaxMath

    @ColfaxMath

    2 жыл бұрын

    Thank you, have a great day

  • @dominickquitoni8668
    @dominickquitoni8668 Жыл бұрын

    Thank you. I have an existing water main in conflict with new stormwater drainage. Your lesson helped determine the exact elevation that conflict occurs and help facilitate an approved redesign with minimal owner expense.

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Great to hear the video was helpful

  • @noahfigueroa3534
    @noahfigueroa35344 ай бұрын

    You were born to teach! Great video. Thanks.

  • @ColfaxMath

    @ColfaxMath

    4 ай бұрын

    Thank you

  • @diamondstateexcavationllc6478
    @diamondstateexcavationllc64782 жыл бұрын

    This was a great video! Just bought my first rotary laser and this helped a lot!! thanks!!

  • @ColfaxMath

    @ColfaxMath

    2 жыл бұрын

    Glad to hear it

  • @genis8530
    @genis85302 жыл бұрын

    Learned this in heavy equipment Operator school but haven't used it in awhile a good refresher I'm mostly doing slopes 3to1 4to1 grade.

  • @ColfaxMath

    @ColfaxMath

    2 жыл бұрын

    Good to hear

  • @DottieA
    @DottieA6 ай бұрын

    i,ve watched lots of videos on this subject and this is the only one i understand, THANK YOU1

  • @ColfaxMath

    @ColfaxMath

    6 ай бұрын

    Great to hear, thank you

  • @osslv
    @osslv Жыл бұрын

    Thank you! You keep it simple.

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Thank you

  • @mateusrosa1
    @mateusrosa1 Жыл бұрын

    Awesome explanation

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Thank you

  • @thomassmearcheck2819
    @thomassmearcheck28196 ай бұрын

    you are a very good teacher !

  • @ColfaxMath

    @ColfaxMath

    6 ай бұрын

    Thanks again

  • @thomassmearcheck2819
    @thomassmearcheck28196 ай бұрын

    you are a great teacher !

  • @ColfaxMath

    @ColfaxMath

    6 ай бұрын

    Thank you

  • @joshuawelborn7936
    @joshuawelborn793611 ай бұрын

    About the clearest explanation!!

  • @ColfaxMath

    @ColfaxMath

    11 ай бұрын

    Thank you

  • @aammiranda
    @aammiranda4 ай бұрын

    Basic math but great presentation; very helpful

  • @ColfaxMath

    @ColfaxMath

    4 ай бұрын

    Glad it was helpful

  • @stepheneurosailor1623
    @stepheneurosailor16233 жыл бұрын

    Very helpful.

  • @ColfaxMath

    @ColfaxMath

    3 жыл бұрын

    Glad to hear it

  • @genebush791
    @genebush791 Жыл бұрын

    Great video

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Thank you

  • @krismettrick6371
    @krismettrick637127 күн бұрын

    I want to learn how to calculate grade for water drainage on a slope. Water is running downhill into our basement. I am excavating in front of our house to prevent water from draining under our house by reversing the slope in front of our house. thank you for helping me with the calculations. it made sense. Does anyone know the slop needed in compacted granite/dirt etc to drain water away from..

  • @ColfaxMath

    @ColfaxMath

    27 күн бұрын

    Not sure how the water actually travels through different types of soil,

  • @irmaguzman4586
    @irmaguzman4586 Жыл бұрын

    Thank you

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Thanks for watching

  • @Skashoon
    @Skashoon7 ай бұрын

    Good stuff, thanks. I’m installing a tankless water heater and it requires a 3 degree slope for the exhaust pipe to prevent rain from flowing back into the combustion chamber. Now I’m befuddled. I used to know all this from geometry and trigonometry but that was in 1971-72. All I want to figure out (or be told) how much drop in inches do I need for a 16” length pipe?

  • @ColfaxMath

    @ColfaxMath

    7 ай бұрын

    Thank you

  • @harryrantz6748
    @harryrantz67482 жыл бұрын

    I'm building a N scale Talmadge Bridge and coming off the Bridge it has a left hand curve then straight for about 2ft with a 2 inch fall. I'm trying to figure out what the grade should be, and what would the angle be in order for it to go from a 2 inch to a 0 degree with a curve at the top. Is that even possible? Can you help me out? Harry

  • @ColfaxMath

    @ColfaxMath

    2 жыл бұрын

    You can measure the height and calculate the run and get the average slope that way

  • @bentleynabigon-froese4484
    @bentleynabigon-froese44847 ай бұрын

    I was trying to understand this for my own math class, but I'm confused! The total length seems to be a horizontal distance (as in your diagram) but you later refer to total length as the length of the pipe! In fact the pipe will be longer than the "total length" from your diagram, because the pipe is your "hypotenuse". Is this a mistake or am I missing something? Thanks for the video though, it is very helpful!

  • @ColfaxMath

    @ColfaxMath

    6 ай бұрын

    Yes that is correct

  • @t.n.1953
    @t.n.1953 Жыл бұрын

    You explained that a 1% slope is the same as 1/100 but how is it expressed as a ratio? Can you explain how ratios are used to express slope, for example a "3:1 slope." Is it for every unit of fall (3) there's a unit (1) of run? That seems extremely steep. Also, how does that translate to percentage?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    1 over 100 is a ratio. Rise of 1 and a run of 100

  • @t.n.1953

    @t.n.1953

    Жыл бұрын

    @@ColfaxMath Thank you for your reply. So is a 3:1 slope a rise or fall of 3 and a run of 1? I hear this used in instances where it would make for sense to be a 1:3 slope

  • @TheBigdoggg33

    @TheBigdoggg33

    7 ай бұрын

    3 to 1 pitch is 3inches of drop for every foot of run. 1st number represents inches

  • @-stealthy-cricket8209
    @-stealthy-cricket820910 ай бұрын

    So, if you have a 6” pipe at an 1/8 “ slope what percentage is 1/8” ? There are no lengths available.

  • @ColfaxMath

    @ColfaxMath

    10 ай бұрын

    If you do 6 divided by 1/8 you get a slope about 1 in 48 which is about 2 percent

  • @kennydixson7851
    @kennydixson7851 Жыл бұрын

    I knew all of that. What I really wanted to know was how much length you lose on account of the grade.?!?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    If I understand your question correctly, you lose the difference between the hypotenuse and the bottom leg

  • @teewithey5879
    @teewithey5879 Жыл бұрын

    What about if I only know the length and have to work out the fall by only knowing the degree at which it should fall at?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    If you have one length and angle have to use trigonometry to find the other pieces. There is a table you can use, or similar triangles

  • @teewithey5879

    @teewithey5879

    Жыл бұрын

    @@ColfaxMath could you elaborate on what to google because I’ve struggled finding anything like it. Could I convert degree to a percentage and work it out that way?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    @@teewithey5879 Tee, I'll try and get around to making a video on it.

  • @user-nv4ke8io4z
    @user-nv4ke8io4z Жыл бұрын

    Am not aware of the numbers,do we have constants?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Just the measurements that you get off the site

  • @user-nv4ke8io4z

    @user-nv4ke8io4z

    Жыл бұрын

    What's the formula?

  • @samanthafranklin9159
    @samanthafranklin9159 Жыл бұрын

    How many inches difference 24 feet2% the fall So what’s the cut to the toe?

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    2% is 2 in a hundred or 1 in 50 or 1/2 in 25 approximately. If you 2% grade you would have to drop a half inch in 25 inches.

  • @reddye2331
    @reddye2331 Жыл бұрын

    Bro takes the longest way home every day I guarantee u tht.

  • @ColfaxMath

    @ColfaxMath

    Жыл бұрын

    Probably