TY - RPRT TI - Tile drainage as karst: Conduit flow and diffuse flow in a tile-drained watershed AU - K. E. Schilling AU - M. Helmers PY - 2008 DO - 10.1016/j.jhydrol.2007.11.014 UR - https://pubs.usgs.gov/publication/70033651 ID - 70033651 ER -