5 in connection 450mm inspection chamber configuration

[lu1]

I'm currently using Inkscape to draw a Building Contol Application for flat roof extension to / renovation of my suspended wooden floor bungalow - please see a screenshot of the drainage (with calculation) as a work in progress attached.

The image currently displays 450mm foul Inspection Chamber "IC5" with:

1/ left 90° branch in connected to internal bathroom stubstack
2/ left 45° branch in connected to ensuite shower
3/ main in connected to ensuite basin
4/ right 45° branch in connected to ensuite WC
5/ right 90° branch in connected to upstream "IC2 main out (which acts as a collector for the planned kitchen stubstack and several other items (including garden hot tub).

As currently configured the bends connecting directly to the Inspection Chamber for items 3/, 4/ & 5/ are greater than 45° with 5/ being greatest at around 60°

Is it known if those connector angles (i.e. adjustables greater than 45) are acceptable, possible or definitely unacceptable in the circumstances?

Any comment appreciated - including if there are any other "obvious" mistakes.

PS:
a/ The fall across the 450mm main channel has been modelled at 10mm while the invert of the Main In to Branch in is odelled at 60mm.
b/ The black drain is a land drain related to rear oversite concrete being 125mm below patio FGL.
c/ It is currently a combined system. With no space for a soakaway I am attempting to separate foul/storm until a final IC before connecting to the public sewer to give it a chance.

 

[noseall]

View attachment 402251

I'm currently using Inkscape to draw a Building Contol Application for flat roof extension to / renovation of my suspended wooden floor bungalow - please see a screenshot of the drainage (with calculation) as a work in progress attached.

The image currently displays 450mm foul Inspection Chamber "IC5" with:

1/ left 90° branch in connected to internal bathroom stubstack
2/ left 45° branch in connected to ensuite shower
3/ main in connected to ensuite basin
4/ right 45° branch in connected to ensuite WC
5/ right 90° branch in connected to upstream "IC2 main out (which acts as a collector for the planned kitchen stubstack and several other items (including garden hot tub).

As currently configured the bends connecting directly to the Inspection Chamber for items 3/, 4/ & 5/ are greater than 45° with 5/ being greatest at around 60°

Is it known if those connector angles (i.e. adjustables greater than 45) are acceptable, possible or definitely unacceptable in the circumstances?

Any comment appreciated - including if there are any other "obvious" mistakes.

PS:
a/ The fall across the 450mm main channel has been modelled at 10mm while the invert of the Main In to Branch in is odelled at 60mm.
b/ The black drain is a land drain related to rear oversite concrete being 125mm below patio FGL.
c/ It is currently a combined system. With no space for a soakaway I am attempting to separate foul/storm until a final IC before connecting to the public sewer to give it a chance.

That drawing gives me a headache.

The shower and basin don't need 110mm drainage extending all the way into the building. Both could discharge into a single external gully, depending on where the shower waste exits the tray.

 

[Hugh Jaleak]

It looks a mess to be honest, and very overcomplicated. Which parts are existing and what are you planning to add?

Keep runs as short and direct as possible, you're showing one run from the bottom left going around 3 sides of the Building, could that go straight across the bottom? Again, the en Suite Bathroom, one 110mm run for the WC and the basin at least could connect to that, possible the shower could too.

 

[stuart45]

I thought I was looking at the London Underground map.

 

[stevie888]

Most drainage plans get amended once you get into the ground: the more complicated the plan the greater the chance. KISS principle.