Arcs Representing Potential Streamflow-loss Zones in Lawrence County, SD

This data set provides information for evaluation of streamflow loss
as mechanism of transport of potential contaminants when assessing
sensitivity of ground-water to contamination in Lawrence County, SD.
This data set is a result of a larger work (WRIR 00-4103 cited above),
which includes a paper plate titled: "Map showing drainage areas
upstream from potential streamflow-loss zones and locations of
selected streamflow-gaging stations in Lawrence County, SD."
Streamflow loss is an important source of recharge to the Minnekahta,
Minnelusa, and Madison aquifers. Water recharged from streamflow
loss compared to direct infiltration of precipitation is more likely
to enter rapid flowpaths through the unsaturated zone and aquifer
media because of solution openings. This data set
includes arcs that represent the stream reaches that cross the
outcrops of the Minnekahta Limestone, Minnelusa Formation, and
Madison Limestone that have potential to recharge the aquifers from
streamflow loss. The source data includes digital data that
characterizes the geology of the Black Hills area, which
has been compiled at 1:100,000 scale and published
in 1999 as part of the Black Hills Hydrology Study.
USGS digital line graphs were used to describe the hydrography.
The loss-zone data set has been archived at the USGS
Water Resources National Spatial Data Information Node.