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3.2

Part 3.2 Earthworks

Part 3.2 Earthworks

(1) A site cut using an un-retained embankment must be—

  1. within the allotment; and
  2. not within the zone of influence of any existing structure on the property, or the allotment boundary as defined in Table 3.2.1 and Figure 3.2.1a; and
  3. not deeper than 2 m from the natural ground level at any point.

(2) Fill, using an un-retained embankment must—

  1. be placed within the allotment; and
  2. be placed at a gradient which complies with Table 3.2.1 and Figure 3.2.1b; and
  3. be placed and mechanically compacted in layers not more than 150 mm; and
  4. be not more than 2 m in height from the natural ground level at any point; and
  5. where used to support footings or slabs, be placed and compacted in accordance with Part 4.2; and
  6. have surface water diverted away from any existing structure on the property or adjoining allotment in accordance with 3.3.3.
Table 3.2.1 Un-retained embankment slope ratios
Soil class (see 4.2.2 for material description) Site cut (excavation) (maximum embankment slope ratio, angle of site cut H:L Note 1) Compacted fill (maximum embankment slope ratio, angle of batter H:L Note 1)
Stable rock (Class A) 8:1 3:3
Sand (Class A) 1:2 1:2
Firm clay (Class M-E) 1:1 1:2
Soft clay (Class M-E) 2:3 Not suitable
Table Notes
  1. See Figures 3.2.1a and 3.2.1b for some examples of un-retained embankment slopes.
  2. Retaining walls must be installed in accordance with H1D3(2) where—
    1. the embankment slope is steeper than described in this Table; or
    2. the soil type is not described in this Table.
Figure 3.2.1a Site cut and fill using un-retained embankments — Site cut commencing at the allotment boundary or affecting an adjoining property
image-3-2-1a-site-cut-fill-unretained-embankments-commencing-allotment-boundary-or-affecting-adjoining-property.svg
Figure Notes
  1. The angle for line A-A is defined as the maximum embankment slope ratio H:L in Table 3.2.1 and is taken from the bottom of the footing and identifies the area suitable for excavation.
  2. Consideration must be given for drainage of surface water, particularly where fill affects an adjoining property.
Figure 3.2.1b Site cut and fill using un-retained embankments — Fill commencing at the allotment boundary or affecting an adjoining property
image-3-2-1b-site-cut-fill-unretained-embankments-commencing-allotment-boundary-or-affecting-adjoining-property.svg
Figure Notes
  1. The angle for line A-A is defined as the maximum embankment slope ratio H:L in Table 3.2.1 and is taken from the bottom of the footing and identifies the area suitable for fill.
  2. Consideration must be given for drainage of surface water, particularly where fill affects an adjoining property.