R code that determines groundwater and surface water source fractions for public-supply water service areas, counties, and 12-digit hydrologic units

This child item describes R code used to determine water source fractions (groundwater (GW), surface water (SW), or spring (SP)) for public-supply water service...本子项描述了用于确定公共供水服务的水源占比（water source fractions，即地下水（groundwater，缩写GW）、地表水（surface water，缩写SW）与泉水（spring，缩写SP））的R代码……