Average annual potential ET minus actual ET, for long-term (1958-2005) (mm/yr)

dataset: ENSYM_ET100_LAA_58TO05
Calculated using the Ensym model. The potential evapotranspiration minus actual un-saturated evapotranspiration calculation can be used to set an upper limit to groundwater evaporation rates. Ensym estimates daily spatial evapotranspiration by solving for physical processes using analytical solutions and empirical equations. Evaporation of water from the soil surface is calculated using a Ritchie's two-stage evaporation algorithim. After infiltration , drying occurs at the potential rate up to a specified limit (stage I) and thereafter at a rate reflecting diffusion processes that are assumed proportional to the square root of time (Stage II). In general transpiration is calculated as a function of pan evaporation, leaf area index, soil moisture content, plant density and temperature however the specifics of the calculations vary with landuse and the particular plant growth model utilised. For further information: https://ensym.dse.vic.gov.au/home/aboutensym Beverly, C., 2007. Technical Manual - Models of the Catchment Analysis Tool. Victoria. Department of Sustainability and Environment.
 
Citation proposal Citation proposal
(2013)

Average annual potential ET minus actual ET, for long-term (1958-2005) (mm/yr)

Department of Energy, Environment and Climate Action
 

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Description

Title
Average annual potential ET minus actual ET, for long-term (1958-2005) (mm/yr) 
Alternate title
ENSYM_ET100_LAA_58TO05 
Purpose
Modelled evapotranspiration data can be used for: - water balance estimates - groundwater modelling inputs - landuse change impact modelling 
Supplemental Information
Related Documents: None 
Status
Completed  
 
 

Temporal

 
 

Spatial

Horizontal Accuracy
100m  
Code
4283 
 
 

Maintenance

Maintenance and update frequency
As needed  
 
 

Format

Title
DIGITAL - ArcView ascii grid 3 
 
 

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Keywords

Topic category
  • Inland waters
  • Farming
  • Climatology, meteorology, atmosphere
 
 

Resource Constraints

Use limitation
Available under license. All use must be approved by the DSE ecoMarkets data custodian. 
Classification
Unclassified  
 
 

Lineage

Statement
Dataset Source: Evapotranspiration estimates are sourced from the DSE Ensym model. Dataset Originality: Primary 
 
 

Metadata Constraints

Classification
Unclassified  
 
 

Quality

Attribute Quality
Comments
Estimates of evapotranspiration vary in accuracy based on input datasets. Variability in temperature recordings and plant growth modelling add the highest uncertainty in ET estimates. 
Positional Accuracy
Comments
Precision: 10 - 100m Determination: Based on the scale of input datasets 
Conceptual Consistency
Missing Data
Comments
State of Victoria 
Excess Data
 
 

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