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03/27/2013 Env Bd Packet
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03/27/2013 Env Bd Packet
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Environmental Board
Env Bd Document Type
Env Bd Packet
Meeting Date
03/27/2013
Env Bd Meeting Type
Regular
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Table 2. Design Storm Events <br />Recurrence Interval <br />(years) <br />24 Hour Rainfall <br />Amount (inches) <br />1 <br />2.4 <br />2 <br />2.8 <br />5 <br />3.6 <br />10 <br />4.2 <br />25 <br />4.8 <br />50 <br />5.3 <br />100 <br />5.9 <br />Source: U.S. Weather Bureau TP-40 (Hershfield, 1961) <br />3.4. Topography <br />The City's hydrologic system includes streams, lakes and wetlands. The City is characterized by gently <br />rolling topography interspersed with lakes, streams, floodplains, various judicial and county ditches, and <br />wetlands that are primarily a result of glaciation. This is due to its location in the North Central Hardwood <br />Forest Eco- region that can be sub - divided into three geomorphic settings: the McGrath Till Plain, the <br />Twin Cities Formation and the Anoka Sand Plain. This system is typical of a glaciated area with outwash <br />plains and terminal moraines. The thinly spread glacial drift is characterized by circular level - topped hills <br />with smooth side slopes averaging between 2 -3% grades. Ground surface elevations range from 850 to <br />950 feet above mean sea level (MSL). Lacking a uniform drainage pattern, many small streams end in <br />lakes or depressions. Low -lying areas contain closed basins with numerous lakes and peat bogs. Water <br />table levels normally occur within three to ten feet of the surface. All ground water levels vary seasonally. <br />3.5. Geology <br />Surficial Geology <br />The surficial geology of Lino Lakes is composed of 2 distinct areas. The City is divided almost evenly <br />between portions of the Anoka Sandplain and an area of loamy till typical of the Eastern Saint Croix <br />Moraine. Organic deposits are present throughout both areas (Figure 3). <br />The northwestern portion of the City is considered to be part of the Anoka Sandplain geomorphic area. <br />The Anoka Sandplain is an outwash plain formed during the retreat of the Grantsburg Lobe. The material <br />making up the plain is principally fine sand. Depressions are common in the plain and were formed when <br />isolated blocks of ice later melted. They are now filled with peat deposits or are marshes and lakes. The <br />landscape within the Anoka Sandplain is generally considered to be a gently undulating plain. Water <br />tables are near the surface in depressions and from 2 to 10 or more feet deep in rises. <br />The southeastern portion of the City is composed of New Ulm loamy till. This area was formed by the <br />Grantsburg sublobe of the Des Moines lobe and is characterized by gently rolling terrain (Figure 3). <br />Bedrock Geology <br />Three bedrock layers exist beneath the study area; Mt. Simon - Jordan, Prairie Du Chien and St. Peter - <br />Platteville. The Mt. Simon -Jordan was formed during the Upper Cambrian and parallels the same extent <br />as the Anoka Sandplain. The Prairie Du Chien and St. Peter - Platteville areas are from the Ordovician <br />period and parallel the glacial till in the southeast portion of the City (Figure 4). <br />City of Lino Lakes SWMP 1 February 8, 2013 Draft' 12 <br />
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