The only reason any of us know God is because he chose us before the foundation of the world. Nothing we’ve done can earn our way to him — it’s all grace. Snow Depths Disclaimer. Snowy Hydro undertakes snow depth readings as required for operational purposes during the snow season. Updates on our website Available bulk resistivity values (ρ) and relative permeability (μr)used to calculate skin depths (δσ) can vary considerably depending.