Designing a house drain By Peter Mentha - South West Institute of TAFE 1
Drainage Design Tasks Step 1 Obtain the house plan Step 2 Identify fixture type and locations Step 3 Identify the type of sewer main connection required Step 4 ORG - Can an ORG be installed? Locate the ORG Step 5 Connect fixtures to the drain Step 6 Identify downstream ventilation Step 7 Locate the upstream vent Step 8 Check unvented branch drain connections Step 8 Label fixture connection methods 2
1. Obtain the house plans Easement Sewer main (B. T. area) From the plans supply determine: The builder willyou can a full set of plans for the project which may include: • Location of the structure • Floor of construction eg Slab on Type plans ground or elevated floor • Elevations • Sections Floor height above ground level • Detail drawings of bathrooms etc Fixture locations • Specifications 105 -1/1 3
2. Identify the fixtures Easement Sewer main (B. T. area) Laundry trough Clothes washer Water closet Bath Shower Sink Symbols are used on house plans to identify the fixtures and appliances. Basin Shower Basin Water closet 105 -1/1 4
3. Identify the sewer connection Easement Sewer main (B. T. area) Details This sewer of sewer main, and of the type main requires the required connection method for any the installation of a property, can be obtained from the Boundary Trap Local Sewerage Authority. The connection will be either: Boundary Trap Or Inspection Shaft 105 -1/1 5
4. ORG location Easement Sewer main (B. T. area) An ORG must be: • Within the property boundary • Outside the building An ORG protects the property against • 75 mm above ground level surcharge from the sewer main. • 150 mm below the lowest fixture • Accessible and noticeable • Have 2 metres clear access above 105 -1/1 6
4. ORG location Easement Sewer main (B. T. area) The ORG can be used to connect waste fixtures to the drain, so a good location is near a suitable fixture. Near the laundry trough on this job is a suitable location Use a dot to locate the ORG 105 -1/1 7
5. Connect the fixtures Easement Sewer main (B. T. area) Use the most direct method to connect each fixture to the drain. Multiple connections may be made to branches. 105 -1/1 8
6. Downstream ventilation Easement Sewer main (B. T. area) BT - GV A property drain with a boundary trap connection requires ventilation at the down stream end. A ground vent is the simplest way to provide the ventilation. A ground vent is suitable for this job. Identify it with a label. 105 -1/1 9
7. Upstream ventilation Easement Sewer main (B. T. area) BT - GV All property drains with require ventilation at the upstream end. The vent must be fitted downstream of the most upstream fixture connection. This is a suitable location for a vent on this job. DV 105 -1/1 10
7. Upstream ventilation Easement Sewer main (B. T. area) BT - GV Once the vent locations are established, the section of the installation which is vented can be identified as the main drain. DV The other sections of the drain can now be checked to decide if they may be installed without additional venting. 105 -1/1 11
8. Unvented branch drains Easement Sewer main (B. T. area) BT - GV Unventilated branch drains: • 10 metres maximum length from vented drain to weir of fixture trap • No more than 2 WC’s connected DV • No more than 30 fixture units connected if DN 100 pipe used. 105 -1/1 12
8. Unvented branch drains Easement BT - GV Sewer main (B. T. area) Maximum length – This is the longest branch on this job. It is less than the 10 m maximum. 7 metres DV This branch has the following number of fixture units connected: Bath 4 Basin 1 Shower 2 Sink 3 Total 10 Fixture units Less than the 30 allowed on a DN 100 drain No branch has more than 2 WC’s 105 -1/1 13
8. Unvented branch drains Easement Sewer main (B. T. area) BT - GV None of the branch drains on this job exceed the requirements of Clause 3. 10 of AS 3500. 2. Therefore, no additional drainage vents are necessary. DV 105 -1/1 14
9. Inspection openings Easement Sewer main (B. T. area) BT - GV Inspection openings are required at: • the point of connection to the sewer main • at the lead-off from the boundary trap • at WC branches • at changes of direction over 45 o DV 105 -1/1 15
10. Labels Easement IO Sewer main (B. T. area) BT - GV IO CWM to Tr. (L) DN 100 PVC(u) drain at 1. 65% Tr. (L) to ORG Label the following items: IO • I. O. ’s WC to 100 x 880 bend • Fixture connections Bth, B, Shr to 100 x 880 bends • B. T. S to 100 x 880 bend • D. V. ’s B, Shr to 100 x 880 bends IO DV • Drain size and gradient WC to 100 x 880 bend 105 -1/1 16
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