GGSD Program Details for UNSODA

UNSODA

Category	Hydraulic properties
Publisher	US Environmental Protection Agency
Platform	DOS
Status	Public domain
Description	UNSODA is a database of unsaturated soil hydraulic properties (water retention, hydraulic conductivity, and soil water diffusivity), basic soil properties (particle-size distribution, bulk density, and organic matter content), and additional information regarding the soil and experimental procedures. The program can be used to: (1) store and edit data, (2) search for data sets based on user-defined query specifications, (3) write the contents of selected data sets to an output device, and (4) describe the unsaturated hydraulic data with closed-form analytical expressions. The unsaturated hydraulic functions are key input data in numerical models of vadose zone processes. These functions may be either measured directly, estimated indirectly through prediction from more easily measured data based upon quasi-emperical models, or approximated by using hydraulic data from similar soils. It serves as a repository of data sets that can be used as a source of surrogate hydraulic data, or for the development and evaluation of indirect methods for estimating the unsaturated hydraulic properties. Three examples are provided to show the reader step-by-step instructions on how to use the program.
Cost	Free on WWW
Data formats supported	None stated
Supplier in United States of America	US Environmental Protection Agency
Supplier in United States of America	USDA Salinity Laboratory