11-16-2017 Agenda and Packet - Laserfiche WebLink

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Canopy cover can be measured directly, through photogrammetrx(measmement from aerial photographs or digitized aerial images) or ground surveys. These methods can be relatively easy to use, and do not necessarily require expensive equipment. Tree density, the number of trees per unit area, is indirectly related to tree canopy cover. Tree density can also be used to estimate tree cover, if the average canopy spread per tree is known. Tree density can be calculated for areas that have a complete tree inventory. 2. Maintain trees in a healthy condition through good cultural practices. A community is not likely to realize most of the benefits that the urban forest can provide if its trees are in poor health. Promoting tree health helps communities protect their investment in the urban forest. Public health and safety also depend on healthy trees. Improperly maintained and unhealthy trees often have an increased risk of breakage or failure, which can result in personal injury and property damage. Cultural practices have a major impact on the health of urban trees. Proper and timely pruning can promote good tree structure and health, whereas topping and other improper pruning techniques can result in hazardous structure and decay. Irrigation is necessary for tree survival in many situations, but excess or improper irrigation practices can contribute to the decline of established trees. By providing for proper tree care and eliminating destructive practices, communities can go a long way toward maintaining their urban forests in a healthy and safe condition. ®rdinance provisions Tree ordinance provisions related to this goal include those that regulate tree maintenance practices (such as pruning) and prohibit or regulate various activities that may harm trees. Management of specific disease or pest problems, such as Dutch elm disease, may be facilitated by provisions that limit species selection, require removal of diseased trees, or authorize other pest management measures. Specific provisions: o Designate administrative responsibilities o Develop a comprehensive management plan o Resolution of conflicts between trees and structures o Help for citizens performing tree maintenance o Topping prohibited o Planting requirements o Harming public trees forbidden o Situations which are declared to be public nuisances o Abatement of hazards and public nuisances o Licensing of private tree care firms o Permit required for activities that may damage city owned trees o Permit required for activities that may damage rotected private trees o Conservation of forest and woodland resources during development