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Wetland Natural Community Descriptions and Management <br />Recommendations <br />The five wetlands in the park have all been altered by urbanization. W1 has most recently <br />changed wetland type from a marsh to a shallow open water habitat through stormwater inputs. <br />The floating vegetative mat of W2 has decreased in size and is being invaded by purple <br />loosestrife. W3 has increased in size and has taken on the characteristics of a stormwater pond. <br />Historically W4 was an open water wetland and has lost hydrology becoming a seasonal basin <br />dominated by reed canary grass. Locations of the improvements discussed in the following <br />paragraphs are shown in figure 6.8 <br />Community RW -W1 <br />Shallow Open Water/Wet Meadow/Lowland Hardwood Forest <br />Qualitative Rank: Medium <br />Acres: 5.7 acres <br />This wetland is a large depressional basin with fringes of wet meadow and a small forested <br />wetland area on the south end. The open water habitat consists of predominantly duckweed and <br />dead trees. The forested wetland and fringe are dominated by reed canary grass, touch -me -not, <br />boxelder, silver maple, and buckthorn. <br />Several discharge points for storm water enter the basin. An increased water level is evident by <br />the inundation and mortality of trees along the fringe of the basin. The National Wetland <br />Inventory Map indicates this basin is Shallow Emergent Marsh. Recent inundation has <br />converted this to open water, however emergents may encroach along the fringes. <br />The only observed potential outlet is a swale at the northeast end of the basin. With the increase <br />drainage to this wetland and the current outlet, it has the potential to become a substantially <br />larger open water area. <br />Currently this wetland has high waterfowl and wildlife values due to the snags and open water. <br />This wetland should be monitored to determine additional expansion of water levels. The outlet <br />elevation should be determined and referenced to the current open water to determine the <br />potential expansion of the open water of this basin. <br />City of Roseville 131 <br />Parks Natural Resource Management <br />