Laserfiche WebLink
In order to assess total cover by invasive and native species in the wetland, weighted averages <br /> were calculated (Table 4). <br /> Table 4.Weighted averages of vegetation cover. <br /> Total Invasive Target Invasive <br /> Wetland Plant Wetland Vegetation in Vegetation in Native Vegetation in <br /> Community Acres Wetland(%cover) Wetiand(%cover)' <br /> Wetland(%cover) <br /> Wet Meadow 2.14 40 40 76 <br /> Vegetated Deep Marsh <br /> (open water excluded)b 0.09 10.5 10.5 6 <br /> Enhanced Lowland Forest 0.35 <br /> (wetland portion)` 32 17 66.5 <br /> Weighted Average 37.9 35.9 72.3 <br /> a Per performance standards,values represent percent cover by cattail,purple loosestrife,and reed canary grass. <br /> b Vegetated Deep Marsh calculated as 18%vegetation cover in the 0.82 acre Deep Marsh. <br /> `Represents Enhanced Lowland Forest within the delineated wetland boundary. <br /> Hydrology <br /> From January through August 2015, precipitation at the nearby Chanhassen weather station <br /> indicated 0.98 inches above average. During our September 2, 2015 monitoring, the vast <br /> majority of the Wet Meadow was observed to be saturated; scattered small pockets of shallow <br /> inundation were observed in areas due to the site's variable microtopography. The Deep <br /> Marsh and associated swales were observed to be inundated. No surface water was observed <br /> leaving the wetland's outlet culvert on the west edge. Figure 3 illustrates "S" for saturated <br /> areas, "I"for inundated areas, and "(1)"for small pockets of inundation. <br /> Performance Standards <br /> For 2015,the performance standard called for<-20% invasive species cover of invasive cattail, <br /> purple loosestrife and reed canary grass in the wetland plant communities. AES's field <br /> monitoring on September 2, 2015, in conjunction with calculated weighted averages, estimated <br /> total invasive plant cover in the wetland to be 35.85%(Table 5); however, invasive plant control <br /> interventions have occurred on the site since our September 2, 2015 monitoring(see Discussion <br /> section below). <br /> MN Board of Water and Soil Resources <br /> Nelson Restoration Site(12-0975)—2015 Monitoring Report 9 <br />