43Drainage of roads and tracks

43 Drainage of roads and tracks

43 Drainage of roads and tracks

(1) This clause applies to the following—

(a) a road or track that existed after the lodgement of the application for authorisation of the plantation on which it is located,

(b) a road or track that existed before the lodgement of the application for authorisation of the plantation on which it is located, and that is not operationally stable.

(2) All reasonable steps must be taken to minimise soil erosion from roads and tracks. Accordingly, at least one of the following measures must be adopted, as appropriate in the circumstances—

(a) establish or maintain vegetative cover (that is, plant material, living or dead, that protects the soil surface from erosion),

(b) crossfall drain the road or track with outfall or infall drainage (preferably with the outward or inward slope being between 4% and 6%), or by shaping the road or track to a crown so that water drains to both of its sides,

(c) construct drainage structures to convey water away from the road or track formation (for example, crossdrains, mitre drains, or relief culverts).

(3) Any drainage structure must be designed so as to convey the peak flow from a 1-in-5 year storm event (that is, a rainfall event predicted to occur more than once in five years).

(4) Any rollover banks must be constructed and maintained to provide a minimum effective height of 15 centimetres consolidated.

(5) Where drainage structures are established on a road or track, the structures must be placed in accordance with the Table below if the concentrated water flow on the surface of the road or track or table drains is likely to exceed the distances specified in the Table.

| If the slope of the road or track is— | Then the drainage structure must be placed at least every— | If the slope of the road or track is— | Then the drainage structure must be placed at least every— | | 1° | 250 metres | 16° | 38 metres | | 2° | 200 metres | 17° | 36 metres | | 3° | 150 metres | 18° | 34 metres | | 4° | 125 metres | 19° | 32 metres | | 5° | 100 metres | 20° | 30 metres | | 6° | 90 metres | 21° | 28 metres | | 7° | 80 metres | 22° | 26 metres | | 8° | 70 metres | 23° | 24 metres | | 9° | 65 metres | 24° | 22 metres | | 10° | 60 metres | 25° | 20 metres | | 11° | 55 metres | 26° | 19 metres | | 12° | 50 metres | 27° | 18 metres | | 13° | 45 metres | 28° | 17 metres | | 14° | 40 metres | 29° | 16 metres | | 15° | 40 metres | 30° | 15 metres |