L1 - http://journals.pan.pl/Content/101873/PDF-MASTER/Lach%20Opyrchal.pdf L2 - http://journals.pan.pl/Content/101873 PY - 2017 IS - No 33 KW - earth-fill dams, monitoring, piezometers, safety of hydraulic structures, scalar product A1 - Lach, Stanisław A1 - Opyrchał, Leszek PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute T1 - Using the modified scalar product approach for testing the direction of seepage through the earth-fill dam in Pieczyska UR - http://journals.pan.pl/dlibra/publication/edition/101873 T2 - Journal of Water and Land Development