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Posted: Sat Jul 28, 2007 6:09 pm
by HayDown
I have two downpipes (one on left one on right) on the back of a garage. Each one will go into a bottle gully. I will then run a pipe below ground to connect each gully. From the gully on the left I will run another pipe to a brook.
Do surface water drains have to be roddable?
How deep should the pipe be that connects the two gullies?
Is this completely the wrong way to do this?!!!!
Please Help!!!!!!!!! 
Thank You
Posted: Sat Jul 28, 2007 7:19 pm
by seanandruby
yes they have to be rodable. go to the index and look under drainage.
Posted: Sat Jul 28, 2007 9:41 pm
by lutonlagerlout
why sean?
if they are going to a bottle gully,then any deitrius gets caught in the gully,and the water flows through
i would be tempted to put mesh or summat over the outlet to stop rats or such coming up the pipe
cheers LLL
Posted: Sat Jul 28, 2007 9:53 pm
by Mikey_C
Can't you just join them a bit futher down the line using Y connector, failing that have two straight runs into the brook. Either way the bottle gullies and the system should roddable, which most are now days.
Best of luck. 
Posted: Sun Jul 29, 2007 7:41 am
by seanandruby
LLL the question was . . . . "do surface water drains have to be rod-able?" well yes they do. that's why we install bottle gullies, ic chambers etc; especially as he is discharging to a brook, with vermin using it as a nesting place in dry weather. also on large construction sites it is the norm to install an i c below and above ground. hope this answers your question. i am not in the habit of giving diyers the wrong info. the law is the law.
Posted: Sun Jul 29, 2007 8:46 am
by lutonlagerlout
ahhh i see,thats why we use "roddable back inlet gullies"
on domestic stuff i have never seen an IC used on RW runs though
cheers LLL
Posted: Sun Jul 29, 2007 8:49 am
by Dave_L
I like using roddable bottle gullies - the ones with the removeable plug to allow rodding.
Posted: Sun Jul 29, 2007 11:46 am
by seanandruby
sorry for the confusion, i meant access chamber above ground. i will post some photos of a few rainwater i c chambers and manholes i have been working on and the need for them. i am also a great believer in a ball of chicken wire in the hopper of gullies.
Posted: Sun Jul 29, 2007 12:40 pm
by HayDown
Thanks for all the info.
I could not understand why rain water drain had to be rodable, but the rat thing has answered my question.
Whats the minimum depth for PVC pipes?
Thank you
Posted: Sun Jul 29, 2007 5:08 pm
by seanandruby
depending on what is going on top of it, IE, garden, patio, driveway etc: 600 to 900 to top of pipe. also if you are going into a brook you may have to build a header wall out of sand bags, or, similar to stop erosion of the bank. if you cant get the depth on the pipework you can go shallower if you surround in concrete. good luck