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Marong map unit Dgb

Back to: A Land Capability Study of the Rural City of Marong

Map Unit: Devonian granodiorite, steep slopeMap Unit Symbol:Dgb
% of Study Area: 0.2

Land-form diagram for Marong map unit Dgb

General Description:
The steep slopes in the granodiorite are only a minor component of the Rural City. They are generally rocky and located adjacent to rocky crests on the rolling hills. The soils are very similar to those on the rocky crest; shallow, uniform coarse sands with dark brown sandy loam top soils. Pockets of deeper uniform sands and duplex soils can occur between outcropping tors.

Site characteristics:

Parent material age: DevonianDepth seasonal
watertable:
>10 m
Lithology: GranodioritePotential recharge to groundwater:Very High
Landform Pattern:Rolling low hillsFlooding risk:Nil
Element:SlopeDrainage:Rapidly drained
Slope common:33%Depth to hardrock: 0.6 m
Slope range: 32 - 35%
Rock outcrop: 10 - 20%

Major vegetation: Long-leaf Box, Yellow Box, Grey Box, Blackwood, Buloke, Black Wattle, Wallaby Grass.

Present land use: Partially cleared, grazing


Land
degradation:
Water erosion
Wind erosion
Salting
Acidification
Sheet/rill
Gully
Susceptibility
High
Low
Moderate
Low
Low
Incidence
Moderate
Very low
Low
Low
Low


Soil profile characteristics:

Permeability (measured - average, range):20080, 12923 - 29583 mm/day
Permeability (estimated):-
Available water capacity:96 mm H2O
Linear shrinkage (B horizon):Low (estimate)


Soil profile description:

A0 - 20 cmDark red brown (5YR3/2) sandy loam, apedal, sandy fabric, loose consistence, high organic matter, pH 5.5. Clear transition to
C 20 - 60 cm Dull red brown (5YR4/4) clayey sand, apedal, sandy fabric, loose consistence, many quartz fragments, pH 5.4. Gradual transition to
60+ cmRock


Soil classification:


Factual Key (Northcote): Uc 1.23 (major) Dy 3.11 (minor)
Australian Soil Classification:Arenic, Rudosol; shallow, thin, loamy, non-gravelly
Unified Soil Group: SM


Interpretation of soil analyses*

Horizon
pH
Gravel
%
E.C.
(salts)
Nutrient
Status
P
K
Al
Organic
Matter
Dispersibility
A
5.5**
21.2
VL
L
D
S
T
H
L
C
5.4**
29.0
VL
VL
D
S
T
L
L
VL : Very Low; L : Low; M : Moderate; H : High; VH : Very High; D : Deficient; S : Satisfactory; T : Toxic; **: Acid * See Appendix 4 for analytical results


Land capability assessment

Land Use
Class
Major limiting feature(s)/ landuse
Agriculture (CTS values)
C3T5S4
Steep slope
Effluent disposal (septic tanks)
5
Steep slope, excessive permeability – risk of polluting groundwater
Farm dams (earthen)
5
Steep slope, shallow depth to hardrock, very low suitability of subsoil, excessive permeability.
Building foundations - slab
5
Steep slope
Building foundations - stumps/footings
4
Steep slope, high risk of slope failure
Secondary roads
5
Steep slope
Urban residential
5
Urban residential 5 Secondary roads, building foundations (slab)
Rural residential
5
Farm dams, effluent disposal, secondary roads, building foundations (slab)



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