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4. Air and Water Quality <br />(a) Trees aid in the filtering of storm water as it passes through the <br />soil to the ground water; <br />(b) Trees maintain permeable land areas essential to the surface <br />water management and aquifer recharge; and <br />(c) Trees aid in the purification of the air through the removal of <br />carbon dioxide, the generation of oxygen, and the precipitation of <br />dust and other airborne pollutants. <br />5. Socioeconomic <br />(a) Trees enhance property values; and <br />(b) Trees protect and preserve the unique identity and environment <br />of the City and aid in the development of the economic base attracted <br />to the City by such factors. <br />6. Erosion and Flood Control <br />(a) Trees aid in the stabilization of soil by the prevention of erosion <br />and sedimentation; and <br />(b) Trees reduce storm water runoff and the costs associated <br />therewith and aid in the replenishment of groundwater supplies. <br />Subd. 4. Definitions. The following words and terms, wherever they <br />occur in the Tree Ordinance, shall be construed as herein defined. The word "shall", where used <br />within the Tree Ordinance, indicates a mandatory action. Words not defined shall be interpreted <br />in accordance with definitions in any standard dictionary. <br />Abuse - Any action that does not follow good arboricultural practices. Abuse <br />also includes damage inflicted upon roots by machinery, changing the natural grade above <br />the root system or around the trunk, changing drainage patterns around the tree, <br />destruction of the natural shape of the tree or any action which causes infection, infestation <br />or decay. <br />Alter - To change the appearance or function of a tree. <br />