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1.) Material have adequate strength and durability.

2.) Diameter of drain to be as small as possible.

3.) Accessibility- every part of drain within reach for inspection and maintenance.

4.) Laid in straight runs as far as possible.

5.) Drains laid to a gradient.

6.) Inlet be trapped. To prevent entry of foul air into building.

7.) Access fittings - Inspection chamber, rodding eye, manhole - placed at changes of direction and gradient.

8.) Inspection chambers placed at junctions.

9.) Junctions between drains arranged so that incoming drain joints at oblique angle in direction of flow.

10.) Avoid drain under buildings if possible.

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