Volume Two 25. Definitions Diversion means altering the natural course or flow of water from a surface water or ground water resour ce. Domestic bore means a bore from which water is taken and used for domestic purposes or for stock. Domestic livestock means livestock bred, reared and/or kept on the property for home consumption, or as pets, or for hobby purposes and from which little or no income is derive d. Drainage channel means an artificial or other watercourse maintained or created for the purposes of removing unwanted wat er. Drainage Channel as mapped on the Drainage Channel Network Map. Network Dredging means any activity involving the dredging of the seabed to provide an adequate water depth for any purpose, and includes dredging activity necessary to maintain water depth levels. Dumping has the same meaning as in Section 2 of the Act. Dwelling has the same meaning as dwellinghouse in Section 2 of the Act that is fully self-contained and used by one household and includes an apartment and a unit (but not the whole building containing the apartment or the unit) but does not include visitor accommodation, workers accommodation and retirement accommodati on. Ecologically as mapped on the Ecologically Significant Marine Sites Maps 1 to Significant Marine 16 . Site Efflux velocity means the velocity of the gases leaving a chimney, pipe or other exhau st. Emergency service means an organisation that is essential to the community’s initial response to an emergency incident or hazard event. Environment has the same meaning as in Section 2 of the Act. Environmental flows has the same meaning as in the National Policy Statement for and/or levels Freshwater Management 2014. In the Marlborough context these are identified in Freshwater Management Unit in Appendix 6. Ephemeral means a wetland, lake, river, or reach of river that only exists or flows for a short period following heavy or persistent precipitation or snowmelt. Erosion means any particulate or mass movement of soil under the influence of wind, water or gravity or combinations there of. Esplanade reserve has the same meaning as in Section 2 of the Act. Esplanade strip has the same meaning as in Section 2 of the Act. Excavation means to dig out soil or natural material from the ground such that the surface contour of the land is permanently altered. 25 – 7