Drainage from Garden office.

[Andy7]

(Also posted in Plumbing... but probably more suitable here in Building)

I'm constructing a garden office and would appreciate a little advice on spec for a waste pipe from the installation to the nearest foul junction. The junction is on my property and about 20m from the location (straight line, no bends needed in the run).

There's a nice gentle incline down from the office. I'd say ground level is about 1-1.5m higher at the office to where the junction is.

I'm hoping to have a single toilet, hand-washing basin and small sink for washing up coffee mugs. Not expecting a massive load on the system.

So, questions:
- Pipe diameter? 110mm?
- Depth of pipe?
- Is the incline enough to allow for the drainage to work with just the pipe?
- Is it worth diverting part or all of the gutter drainage through this to help keep things flushed through and clean (roof area ~36sqm).

I'm hoping to avoid needing a macerator in the toilet.

Cheers all.

 

[noseall]

So, questions:
- Pipe diameter? 110mm?
- Depth of pipe?
- Is the incline enough to allow for the drainage to work with just the pipe?
- Is it worth diverting part or all of the gutter drainage through this to help keep things flushed through and clean (roof area ~36sqm).

Pipe diameter correct - 110mm.

You are advised to have a minimum of 300mm cover.

A 20m run of pipe at recommended fall (1:40) would require a fall of 500mm so you have plenty of depth to work with.

The gutter should ideally have its own storm soakaway. However, there have been more than one occasion where i have been to blocked drains where the homeowner has recently returned from a holiday. I guess this is down to poorly laid drains, having a build up of silt that has crusted whist the drain has been dry.
Probably.

A well laid plastic drain with adequate fall will not need to be kept flushed.

 

[Andy7]

Thanks noseall - reassuring advice.

 

[artificialgrass]

good drainage is the foundation to your landscape. It's one of the first issues I tackle when planning a new yard and garden