Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 72
the ET result won’t be correct.
WindUnits
Specify the units of the wind speed measurement input (“WS”). Choices are ft/sec,
km/hr. knot, mph. or m/s. Be sure you configure the wind speed input to produce a
result in the selected units, otherwise the ET result won’t be correct.
ETUnits
Specify the units of the evapotranspiration calculated output. Choices are cm, in. or mm.
ETType
Specify the type of evapotranspiration calculation to make. Choices are ETo
(Standardized Reference Evapotranspiration, short grass), ETr (Standardized Reference
Evapotranspiration, tall alfalfa), or ETWater (Same as ETo except uses albedo of 0.06,
characteristic of open water).
WindElevation
Elevation in meters at which wind measurements are taken.
Input Type (AT, BP, RH, Solar, and WS)
Each input has an InputType property and associated fields for configuring how to make
the corresponding measurement. When creating the ET measurement for the first time,
the system prompts you to create and configure inputs for each of the input types.
Since the inputs are expected to be averaged, you will typically use the Reference input
type to select an averaged output you’ve already set up.
Property Changes
When making changes to an evapotranspiration measurement property, you may be
prompted, “Reset ET data?” Press SET/YES to have the final result computed using
samples taken only from the point of reset on. Press CANCEL/NO to have the final result
computed using the samples taken so far, as well as those to come (if you’ve made
changes to a property that will cause samples so far taken to be invalid, then select
SET/YES).
Calculation Technique
The calculation technique is based, in part, on an example presented at the New Mexico Climate
Center web site:
http://weather.nmsu.edu/math/penmans.html
The web site provides a link to an Excel spreadsheet with the example.
The ASCE Task Committee reports are available at:
http://www.irrisoft.net/downloads/literature/ASCE%20Standardized%20Equation%20Jan%2020
05%20Apendix%20A.pdf
http://www.irrisoft.net/downloads/literature/ASCE%20Standardized%20Equation%20Jan%2020
05.pdf
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