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5. LAKE INVENT�RY METHUDOL�GY <br />AND RESULTS <br />IN'TRODUCTION <br />The City of Rosevzlle directed that two lakes be included in the NaturaI Resources Inventory <br />pro�ect. They arc Langton Lake in Lanb on Lake Park and Bennett Lake in Central Park. Key <br />information for these la�Ces is summarized in Table 5.1 below. <br />Table 5.1 - Lake Data Surnmary <br />Lake Data Summ�ary - City of Roseville <br />Bennett Langton <br />MN DNR-Ill 48W 2Q4W & 49W <br />Surf'acc Area (ac.) 27_5 23 <br />Direct Watershed Area (ac.) 141 121 <br />Total Watershed Area (ac_) 70b 188 <br />Percent Watershed within Roseville IOO�Ic 100�In <br />Watershed Area/iake area ratio 26:1 8:1 <br />Average Depth (feet) 5 3 <br />Maximum Depth (feet) 9 5 <br />Residence ("flushing") time 70 days i7Q days <br />LAKE WATER QUALITY PRiMER <br />One of the mast acute concerns regarding mana�emcnt of lakes in general and urban lakes in <br />partieular is the effect of nutrient enrichment or eutrophication. The most obviaus sym�tom of a <br />nutrient enriched lake is an abundance of certain types of algae. Al;ae are sma�l, often <br />microscopic plants usually suspended in the water column of a lake. They obtain almost all of <br />their nutrients from Che water column in a dissolved form. A balanced population of algae is an <br />Ciry of Roseville 32 <br />Parks Nattrral Resorcrce Maiiagence�at <br />