TY - RPRT TI - Determination of vadose zone and saturated zone nitrate lag times using long-term groundwater monitoring data and statistical machine learning AU - Martin J. Wells AU - Troy E. Gilmore AU - Natalie Nelson AU - Aaron Mittelstet AU - J.K. Bohlke PY - 2021 DO - 10.5194/hess-25-811-2021 UR - https://pubs.usgs.gov/publication/70218255 ID - 70218255 ER -