Download and crop the National Hydrography Dataset.Source:
get_nhd returns a list of `sf` objects extracted
from the National Hydrography Dataset.
A `Raster*`, `Spatial*`, or `sf` object to serve as a template for cropping.
A character string naming the study area.
Extract data from the USGS NHDPlus High Resolution service (experimental)
A character string indicating where the extracted and cropped NHD data should be put.
If an extraction for this template and label already exists, should a new one be created?