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City of Arden Hills-Comprehensive Plan- DRAFT <br /> o Rarity of community type within the watershed: Natural community types <br /> that are rare due to specific site requirements (fens, bogs, etc.), or have <br /> become rare due to historic land use changes or degradation (prairie, oak <br /> savanna, etc.)were considered more important than more common <br /> natural community types. <br /> o Adjacency to other natural areas: Natural areas that are immediately <br /> adjacent to several other natural areas were considered to be more <br /> important than natural areas that are adjacent to one or no other natural <br /> areas. <br /> o Proximity of healthy natural areas to other healthy natural areas: Healthy <br /> natural areas that are in close proximity to each other(within 1/8 of a <br /> mile)were considered more important than isolated healthy natural <br /> areas, healthy natural areas in close proximity to degraded natural areas, <br /> or degraded natural areas in close proximity to each other. <br /> These natural resource characteristics were combined to form the overall natural <br /> resource assessment ranking for each area shown on the map. <br /> 10.5.2 Wetland Restoration Assessment <br /> All wetland areas within the RCWD were evaluated to determine their potential <br /> • for vegetation and/or hydrologic restoration. A wetland's potential for either type <br /> of restoration was determined in the following manner: <br /> o Vegetation Restoration: The MLCCS data includes information on whether <br /> or not a natural area is dominated by invasive species. Wetlands <br /> dominated by invasive species represent an opportunity to restore native <br /> vegetation. Taking this into account, wetland communities that were <br /> recorded in the MLCCS as dominated by invasive species and greater <br /> than 2 acres in size were included in this category and displayed on the <br /> map. <br /> o Hydrologic Restoration: National wetland inventory (NWI) data and ditch <br /> inventory data were used to identify wetlands with the potential for <br /> hydrologic restoration. The location of partially drained wetlands in the <br /> NWI data and the location of known ditches were used to identify wetlands <br /> that have been partially drained and could be restored to more natural, <br /> flow through hydrology without necessarily changing the hydrologic <br /> regime. Only polygons 1 acre or larger were included and displayed on the <br /> map. Wetland areas with these characteristics that were in close proximity <br /> to existing infrastructure (homes, businesses and roads)were removed <br /> from consideration. <br /> 10.5.3 Lake water quality assessment <br /> • DRAFT 65 <br /> 3/14/2008 <br />