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2002 Natural Resources Management
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2002 Natural Resources Management
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7/13/2012 10:46:09 AM
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The relatively low water quality grades for Bennett and Langton lakes are not unusual in an <br />urban environment. Shallow lakes (i.e., those with mean depths of less than 10 feet) like Bennett <br />Lake and Langton Lake are extremely productive environments, meaning that even under <br />pristine conditions they are rich in aquatic vegetation. The main reason for this is sunlight can <br />penetrate to the bottom almost anywhere in the lake at adequate intensities to support both <br />vegetation rooted to the lake sediments well as other types of plants like algae that float in the <br />water column. In addition, nutrients washed into the lake from the surrounding watershed — <br />whether held in the lake sediments or suspended in the water column — are available to support <br />plant growth. <br />In contrast, deeper lakes often have a significant portion of the lake bottom that does not receive <br />enough sunlight to support plant growth. Also, the deep portion of a lake is separated from the <br />upper shallow portions of a lake for much of the growing season through a process known as <br />thermal "stratification ". With the warmer water layer on top and cooler layer on the bottom, <br />relatively little water is exchanged between the two layers for most of the recreation season. The <br />deeper portion of these types of lakes can act as "storage" for excess nutrients, holding high <br />concentrations in areas of the lake that are too deep to allow the light intensities necessary to <br />support algae growth. <br />Each of the two lakes is described in detail below in terms of its basin and watershed <br />characteristics as well as its ecology, use and quality. <br />LANGTON LAKE <br />Lake and Watershed Overview <br />Figure 5.1 shows the location of Langton Lake and the approximate bounds of its watershed. <br />Langton Lake occupies a total surface area of 23 acres. Average depth of the lake is around 3 <br />feet, while the maximum depth is around 5 feet. <br />City of Roseville 38 <br />Parks Natural Resource Management <br />
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