Landscape Units

Soils/Landforms of the Wimmera Irrigation Area

Landscape and Soil Relationships in the Wimmera Irrigation Area

The Wimmera Irrigation Area landscape and soils map covers approximately 55,600 hectares. Fifteen broad landscapes have been mapped in this area. These landscapes are listed in the Table below together with probable original vegetation, characteristic soil types and landforms. These are clickable and lead to further information. The sixteenth broad landscape is a compound unit made up of a number of (single) lake and lunette units. This was necessary due to the scale of the map produced. It was delineated from the surrounding landscape north east of Murtoa. Due to the complexity of soil formation, landscapes are at best only a general guide to the distribution of soil types. The landscapes in the Table below are listed in the same order as on the map legend.

Characteristic Features of Landscape Mapping Units

Landscape and Mapping Unit Symbol	Probable Original Vegetation	Characteristic Soil Type	Landform General Description
Gently Undulating Plains (GP)	Buloke, Spear and Wallaby grass	Kalkee clay	Undulating plains with long gentle slopes and occasional slight rises.
Moderately Undulating Plains (MP)	Buloke	Longerenong clay, Drung sandy clay loam	Moderately undulating plains.
Eroded Ridge Crest (EC)	Buloke	Kalkee clay, Drung sandy clay loam	Undulating plains, occasional sharp rises with associated depressions.
Eroded Plain (EP)	Buloke	Drung sandy clay loam, Longerenong clay, Kalkee clay	Level to gently undulating plains
Eroded Slope (ES)	Buloke	Drung sandy clay loam, Longerenong clay, Kalkee clay	Gentle to moderate slopes.
Flood Plain (FP)	Grey Box	Horsham clay, Murtoa clay, Drung sandy clay loam	Level areas, occasional slight rises.
Level Plain (LP)	Spear and Wallaby grass	Kalkee clay	Level areas.
High Plains (HP)	Spear and Wallaby grass, Grey Box, Box, Buloke and Yellow Gum	Type E, Drung sandy clay loam, Horsham clay and Murtoa clay	Level, gently undulating in some areas, typically sloping down to the Flood Plain unit.
Lake and Lunette (single unit) (LS) Lake and Lunette (clustered unit) (LC)	Black Box on lake beds, Buloke and occasionally grasslands on lunettes	Bungallally clay on lake beds, Drung sandy clay loam and Drung sandy loam on lunettes	Lake beds or depressions with rises, crescent shaped in plan, on eastern sides.
Dune and Swale (DS)	Brown Stringbark, Apple Box, Yellow Box and Yellow Gum with heath understorey	Quantong sand, Haven sandy loam, Haven sandy clay loam, Norton Sandy Clay	Sand sheets, sand dunes, typically east-west, interdune corridors.
Sand Plain (SP)	Box, Buloke and Yellow Gum Tall Woodland	Haven sandy loam, Quantong sand shallow phase and Murtoa clay	Level to gently sloping plain.
Prior Stream Flood Plain (PS)	(Grey) Box, Buloke and Yellow Gum, Spear and Wallaby grass	Murtoa clay, various red and grey soil complexes	Level plain, occasional slight rises, shallow stream courses and associated levees.
Black Box Flats (BB)	Black Box	Murtoa clay, Horsham clay	Level areas or narrow valley flats.
River Frontage (RF)	Black Box	Murtoa clay, various unclassified soils, Norton Sandy Clay	Generally narrow low lying often dissected areas bordering the Wimmera River.
Valley Floor (VF)	Black Box	Unclassified soils	A low lying area at the southern end of the Yarriambiack Creek.

Location:

Soil Profile Morphology:

Surface soil horizon
Surface Soil	Depth (cm)	Description

Subsoil horizon
Subsoil	Depth (cm)	Description

Soil Profile Characteristics:

Soil Site Characteristics
	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)
Subsoil (B21 horizon)
Deep Subsoil (at cm)
Surface (at cm)

Soil Profile Graphs:

Chemical Analysis

Chemical Analysis
Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC (dS/m)	NaCl %	Exchangeable Cations (meq/100g)				Organic Carbon	Oxidisable Organic Carbon g/100g	Total Nitrogen	Exchangeable Acidity meq/100g	Exchangeable Aluminium mg/kg	Exchangeable Boron mg/kg	Available Boron mg/kg
						Ca	Mg	K	Na

Physical Analysis

Physical Analysis
Horizon	Horizon Depth (cm)	Bulk Density g/cm³	Field Capacity pF2.5 w/w g/g %	Wilting Point pF4.2 w/w g/g %	Coarse Sand (0.02-2.0mm) %	Fine Sand (0.02-0.2mm) %	Silt (0.02-0.002mm) %	Clay (<0.002mm) %	Gravel %

Landscape Units

Location:

Soil Profile Morphology:

Soil Profile Characteristics:

Soil Profile Graphs:

Chemical Analysis

Physical Analysis

Management Considerations

Whole Profile:

Surface (A) Horizons:

Subsoil (B) Horizons:

Landholder Comment:

Described By:

Reference: