2002 Draft Natural Resources Management

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• Both water quality and the diversity of the native aquatic plant community appear to have improved significantly over the last 15-25 years. • Water level fluctuations in the lake in response to precipitation events are small to moderate for an urban la�Ce. This is important in fostering a stable and diverse frin�e of emergent vegetation. Expansion of the watershed and increases in imger�ious coverage without full rate control sho�ld be avoided to protect this condition. • The north cell of the Lake is dominated by emergent ve�etation. This condition likely exists because of the shallow depth of the basin and may be exacerbated by high nutrient loadings to this cell from its watershed. SENNETT LAKE Lake and Watershed Ove�view Bennctt Lake and the approxirz�ate bounds of the land area draining to it is shown in Figure 52. Bennett Lake occupies 27.5 acres, about a third or rnore of the total area of Central Park. The lake has mean depth of about 5 feet and maximum depth of about 9 feet. Bennett drains to Lake �wasso to the northeast via the wetla�d in Central park. Prior ta 1980's �vater was pumped aut of the lake. In 1996, an open channel that connected Lake Bennet �vith the wetland replaced the �ift station. Bennett Lakc has a total watershed area oi approximately 758 acres. It extends east to Victoria Avenue, wcst halfway beiwcen Hamline and Snelling, north up to County Road C2 and south to Larpentcur Avenue. The direct drainage to Bennett Lake (i.e. the area whose runoff reaches the Lake without first traveling throu�h another lake or pond) comprises about i40 acres. A large portion of the direct draina�e, abaut 28 %, comes frozn� Central park, �vhile residential use accounts for 62 %. Indirect draina�e (i.e., that portion of the watershed that drains throu;h other ponds first before reaci�ing Bennett Lake) is 620 acres and is dominated by resiclential use mixed with some industrial. Ciry of Roseville `�G Parks Natirral Resai�rce Nlc�nagelaae�at