Shielding, grounding and protective layers, or accompanying humidity in the case of underground drains may contribute to increase the conductivity of soil and ground surface directly above them by several orders of magnitude.
Shielding, kutuliza na tabaka ya kinga, au unyevunyevu kuandamana katika kesi ya chini ya ardhi Machafu inaweza Kuchangia Kuongeza conductivity ya udongo na uso ardhini Moja kwa moja juu ya mandhari kadhaa kwa amri ya ukuu.