CCP 09-10-2001 - Laserfiche WebLink

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GENERAL DESIGN CONSIDER\TIONS FOR WILDLIFE POND CONSTRUCTlON AND WETLA.'m ALTER.-I.TIONS The Rice Creek Watershed District h::ls reviewed inform::ltion from t.':!e U.S_ Army Corps of Engineers and the evIinnesot::l Department of Natural Resources on the design and construction of wildlife ponds. The RCWD recommends th::lt the foilowing considerations be incorporated. to the gre::ltest possible extent, when constructing wildlife pond. or wnrking within wetland areas. SIZE: The wildlife pond should be at le::lst lJ4 acre in sur6ce area size. although brger ponds (u.p to 1 acre) are preferred. SHORELINE CONTO~ It is recommended th::lt a variable (rather th= an even- sided) shoreline be conatructed. This will increase the amount of shoreline per unit area thereby creating isolated areas conducive for waterfowl usage. BOTTOM CONTOUR: The bottom contour should be varied tn promote the growth of emergent vegetation. A 50% open water and 50% veget..:ltive cover (including the emergent vegetadon around the shoreline) will provide the greatest diversity of wildlife species. Watar depth should be abuut 12 co 18 inches in t.':!e sh::lllow are::l of the b::lsin and about 3 to 4 t'eet illo.."timum in the deepest areas. SIDE SLOPES: The upbnd side slopes towards the pond should range from 3:1 to 10:1. The pund bottom side slope should be 8:1 to 12:1. BUFFER ZONE: It is imoort=t to re-est::lblish and mainw.in an upl=d veget.o.ti~e buffer zone around the perimetar of the wildlife pond to provide nesting habit.o.t =d filtar runnff. Mowing of upl=d areas should be avoided. if possible, until August 1 to pro tact nesting areas and allow for brood dispersal. BOTTOM :'I'1ATERIAL: If possible, topsoil should be placed on the bottom of the basin to provide a mare suir..J.bie base for aquatic '1egec.:J.tive growt.':!. In addition, "muck" from an existing wetland should be added to the topsail, providing a "seed" for a benefici::ll biologic::l1 aquatic community to be established. DREDGED SPOILS, All dredged spoils from pond exc::lvation activity will need r.n be placed above the existing lOa-year flood elevation for the site. Erosion control measures such as silt fences and/or st.o.ked hay bales will need to be provided around the spoils. The spoils should be placed within a diked upland area to allow the spoils to dewatar into the soil. I .1 I I I I I I I .. I I I I I I I .. I