List of the dataset
The dataset summarizes the populations and public water systems that receive surface drinking water supply from National Forest System (NFS) lands managed by the USDA Forest Service in the contiguous United States.
This SPEI is calculated using R's SPEI package in 'kernel -- rectangular', 'distribute -- log-Logistic' and 'fit -- ub-pwm' mode, with AWAP's monthly rainfall and ALWB's potential evapotranspiration.
SPEI package: https://cran.r-project.org/web/packages/SPEI/index.html
AWAP website: http://www.csiro.au/awap/
Australian Landscape Water Balance website: http://www.bom.gov.au/water/landscape/
A bit information of Irrigation & Water Use
Spatial subsets of the land products are available for predefined areas of about 8 X 8-km centered on the selected Eddy Flux sites.
Freshwater is primarily used for thermoelectric power (45%), irrigation (32%), public supply (12%), self supplied industrial (5%), and aquaculture (3%) in the United States. Report
https://datacatalog.worldbank.org/dataset/world-maps-k%C3%B6ppen-geiger-climate-classification