Drainage - Not working

[nick@dunsdale]

so who does camera surveys is drainage service type people.

[lutonlagerlout]

if its a brand new installation it has to work,
i reckon they have a back fall someplace between C and B
what is the invert of the pipe between C and B?
time to get digging I reckon
LLL

[flowjoe]

Whats the post code of the site Nick, i might know someone in the area.

[nick@dunsdale]

Whats the post code of the site Nick, i might know someone in the area.

td7 5eb

likely miles and miles from anybody you know lol

[nick@dunsdale]

Over 40 inches the pipe should fall an inch. Or converted you could also say that over 40mm it should drop 1mm. Thats a fall of 1:40

So the maths...

The total length of the run of pipe is 36m. To work out the fall, 36000mm divided by 40. Will tell you how many mm the drop should be.

Or 36m divded by 40 equals 0.9m

I hope this helps

Over 40 inches the pipe should fall an inch. Or converted you could also say that over 40mm it should drop 1mm. Thats a fall of 1:40

Just so i can get my head round all these drainage calculations once and for all lol, maths was never my strong point. I understand the above.

The total length of the run of pipe is 36m. To work out the fall, 36000mm divided by 40. Will tell you how many mm the drop should be.

Or 36m divded by 40 equals 0.9m

I also understand this sum so the caculation above gives a run of 1:40 witch means the pipe drop's 40mm per meter, is that right ??
And it would require 900mm overall drop from start to finish to achieve this.

Okay if i am understanding that part correctly, what i cant get my head round, this must make me bottom of the class lol

If you halved that caculation to a run of 1:20
20 divided by 36000 that gives you 1800mm, if the run is decreased to dropping 20mm per meter why does the overall depth over the full run increase.

Lol i can just see all the guys shaking their heads and saying this guy is so thick


p.s. i know this cant be done on my site as i dont have the depth, i am just using the post and it's figures to try and rid me of my thickness

[Carberry]

Over 40 inches the pipe should fall an inch. Or converted you could also say that over 40mm it should drop 1mm. Thats a fall of 1:40

So the maths...

The total length of the run of pipe is 36m. To work out the fall, 36000mm divided by 40. Will tell you how many mm the drop should be.

Or 36m divded by 40 equals 0.9m

I hope this helps

Over 40 inches the pipe should fall an inch. Or converted you could also say that over 40mm it should drop 1mm. Thats a fall of 1:40

Just so i can get my head round all these drainage calculations once and for all lol, maths was never my strong point. I understand the above.

The total length of the run of pipe is 36m. To work out the fall, 36000mm divided by 40. Will tell you how many mm the drop should be.

Or 36m divded by 40 equals 0.9m

I also understand this sum so the caculation above gives a run of 1:40 witch means the pipe drop's 40mm per meter, is that right ??
And it would require 900mm overall drop from start to finish to achieve this.

Okay if i am understanding that part correctly, what i cant get my head round, this must make me bottom of the class lol

If you halved that caculation to a run of 1:20
20 divided by 36000 that gives you 1800mm, if the run is decreased to dropping 20mm per meter why does the overall depth over the full run increase.

Lol i can just see all the guys shaking their heads and saying this guy is so thick


p.s. i know this cant be done on my site as i dont have the depth, i am just using the post and it's figures to try and rid me of my thickness

Over 40mm it should drop 1mm , or swap mm for whatever unit of measurement that you want ie: over 40" it should drop 1".

Over 1m ie: 1000mm it should drop 1000/40 = 25mm

If you halve the ratio you are doubling the fall so it would be a fall of 50mm over 1000mm ie: 1000/20

[nick@dunsdale]

a to b should be 119mm not 64mm. As it is The first run is 1:123
My brain hurts.....

okay getting the picture now just read the graidents and falls page as well

So if B had been down to 119mm instead of 64, do you chaps thinks that could also make a difference.

Lol this may be my last question for awhile, till i get onto the contractors

[Carberry]

That would make a difference and it could solve your problems, but as others have said there could be other issues.

[nick@dunsdale]

That would make a difference and it could solve your problems, but as others have said there could be other issues.

yes i was giving that some more thought, the waste is not traveling 8 meters on the straight run.

I dont know much about this kind of thing but that is not far at all is it ??

So i suppose there may well be additional problem

For instance my pipes are quite close to the surface and there is a concrete pad over the top of them for the door step, perhaps this has caused the pipe to sag

[digerjones]

from my experience you can put plastic in with hardly any fall at all and it will work, i would say you have a problem with the ic or something else. sounds a easy fix if close to surfase, shame about the concrete. good look