Black Hills Hydrology Study
http://sd.water.usgs.gov/projects/bhhs/Intro.html

USGS


This USGS site contains information on the geology units, topography, and precipitation rates of the Black Hills as it relates to the hydrology. Included is a map defining the study area, precipitation graphs, a stratigraphic column, a map denoting the distribution of hydrogeologic units, a geologic cross section, and a photo of the hydrogeologic setting. Links to an introduction to this study, objectives, products, references, and digital map services are also available through this site.

This resource is referenced here:
Subject: Geoscience:Geology, Hydrology:Surface Water
Resource Type: Scientific Resources:Overview/Reference Work
Topics: Solid Earth, Hydrosphere/Cryosphere:Surface Water