Finally, groundwater is a “hidden resource” which is quantitatively much more significant than surface water and for which pollution prevention, monitoring and restoration are more difficult than for surface waters due to its inaccessibility.
Go deireanach, “acmhainn cheilte” atá i screamhuisce atá i bhfad níos tábhachtaí de réir méide ná uisce dromchla agus dá bhfuil cosc truaillithe, monatóireacht agus tabhairt ar ais níos deacra ná mar atá i gcás uiscí dromchla de bharr é a bheith dorochtana.