My drainage plan, critiques invited.

[epsilonGreedy]

My floor beams arrive tomorrow then the underfloor drainage and floor goes in next week.

 

Here is my plan for the drainage excluding roof rainwater drains. The site is gradient challenged which means the main horizontal runs are at 1 in 80. A surface water flood risk requires a raised FFL so plenty of drop below the block & beam floor for rest bends.

 

On large square on the plan = 1m.

 

DW = disk washer

WM = washing machine

SP = soil pipe.

 

[PeterW]

Looks complicated. 

 

Can simplify and lose some of the ICs. 

 

SP pickups from upstairs as per previous - rest bend and into a 45 Y connector. 

 

On  right side, feed the sink into the toilet branch, come out at the right into a rodding point or even a back inlet gully with a rod point. 

 

Make sure you bench the rest bends properly - they need to be encased in concrete, stand them on a block dug into the oversite for good measure. 

 

And don't forget - on most inspection chambers, the flow run is 30-50mm lower than the side branches ..!