modeling pvc pipes in gravel swale

[balkisantana]

i currently have a gravel swale in one of the subcatchments

i want to embed pvc pipes in the swale for storage

how to i do this? do i model them as ponds?

 

[balkisantana]

sorry

its not a pvc, its a series of hdpe pipes

 

[TerryScan]

Read the HydroCad Help on "embedded storage".

 

[psmart]

Also please see

http://www.hydrocad.net/chambers.htm

Pipes are embeded exactly the same as chambers.

 

[balkisantana]

can I model these on a slope

continuous x-section area with both top and bottom sloped @ 7%, side slope = 0

??

 

[psmart]

You can specify a slope for horizontal cylinder storage (your pipe), but the other storage volumes are always level. However, you should be able to model this by using custom storage and entering surface areas.

 

[balkisantana]

psmart, thanks for your help but I am trying and can not figure it out, I have tried custom stage data but it keeps telling me that my pipe is extending above my stone?

do I need to fill ou the incremental storage and cum storage?


is there any way you could kind of walk me through it if you have a few minutes of spare time?

could you kind of walk me through an example

say I have a 12" pipe imbedded in a 2'x2' stone, both sloping @ 10% for 10'


start
top stone: 2.5'
top pipe: 2'
inv pipe:1.5'
bot stone:1'
end
top stone:1.5'
top pipe:1'
inv pipe:.5'
bot stone:0'

if anyone can help it would be greatly appreciated

thanks in advance

 

[balkisantana]

i think i figured it out, i was forgetting to multiply the length by the width of the bed for the sa

thanks

 

[balkisantana]

nope i didnt figure it out

im stuck again

the program keeps saying my pipes are above the imbedded storage

arrrrgh

 

[psmart]

The message means that the top of the pipe extends above the highest stage in the storage definition.

Remember the invert elevation for any storage volume is always the lowest point, which corresponds to the "outlet" of a pipe. Perhaps you've entered the upper (inlet) elevation instead?

 

[balkisantana]

thanks again psmart,

after traying over and over I realized that I was modeling from the invert in down stream when i should have been modeling from the downstream invert