2002 Natural Resources Management

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grass monotype. This is the area that is only temporarily flooded as most normal flows are confined to the channel. The outlet under the trail on west end of this basin allows water levels in the wetland to be lowered. Currently the basin contains reed canary grass and draw down of the water levels in the basin occurs between storm events. In order to control the reed canary grass, the water levels will need to be maintained at 16- inches below top of trail outlet. This could be accomplished with a wood control structure. There is also connectivity to W3 to the south through a 12 -inch CMP. An upland buffer of native vegetation could be planted upslope of the wetland on the south side to replace the turf directly adjacent to the wetland basin. The recommended width of this buffer is 25 feet to provide pretreatment of the adjacent turf area. It would be a good location for educational signage regarding buffers due to the pedestrian traffic and proximity to the arboretum area. Purple loosestrife in this basin appears to be at a manageable level to be spot sprayed. Due to the trails close proximity to the shallow marsh portion of these basin active landscaping with native shallow marsh plant material could be pursued to enhance the plant community and aesthetics along portions of the trail. Community Activity Priority Estimated Cost Comments CP -W2 Control purple High $800.00 Spot spray to prevent spread. loosestrife CP -W2 Plant native Medium $750.00 Aesthetic vegetation along trail CP -W2 Outlet control Medium $3,500.00 Restore hydrology outside of main structure channel. CP -W2 Plant buffer High $150.00 Replace turf between trail and wetland near arboretum area. CP -W2 Install High $500.00 Use in conjunction with buffer educational planting. signage City of Roseville 96 Parks Natural Resource Management