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2002 Natural Resources Management
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2002 Natural Resources Management
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5. LAKE INVENTORY <br />METHODOLOGY AND RESULTS <br />INTRODUCTION <br />The City of Roseville directed that two lakes be included in the Natural Resources Inventory <br />project. They are Langton Lake in Langton Lake Park and Bennett Lake in Central Park. Key <br />information for these lakes is summarized in Table 5.1 below. <br />Table 5.1 - Lake Data Summary <br />Lake Data Summary - City of Roseville <br />Bennett <br />Langton <br />MN DNR -ID <br />48W <br />204W & 49W <br />Surface Area (ac.) <br />27.5 <br />23 <br />Direct Watershed Area (ac.) <br />141 <br />121 <br />Total Watershed Area (ac.) <br />706 <br />188 <br />Percent Watershed within Roseville <br />100% <br />100% <br />Watershed Area /lake area ratio <br />26:1 <br />8:1 <br />Average Depth (feet) <br />5 <br />3 <br />Maximum Depth (feet) <br />9 <br />5 <br />Residence ( "flushing ") time <br />70 days <br />170 days <br />LAKE WATER QUALITY PRIMER <br />One of the most acute concerns regarding management of lakes in general and urban lakes in <br />particular is the effect of nutrient enrichment or eutrophication. The most obvious symptom of a <br />nutrient enriched lake is an abundance of certain types of algae. Algae are small, often <br />microscopic plants usually suspended in the water column of a lake. They obtain almost all of <br />their nutrients from the water column in a dissolved form. A balanced population of algae is an <br />City of Roseville 34 <br />Parks Natural Resource Management <br />
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