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Updated Storm Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />IV. LAND AND WATER RESOURCES INVENTORY <br />Each plan must contain an inventory of water resource and physical factors affecting the water <br />resources based on existing records and publications. If data publications and maps are available <br />at a convenient central location, they may be included by reference. The plan must include a <br />brief summary of the data and must identify where the publication can be obtained. The <br />following subsections are required. <br />A. Precipitation <br />The state climatology office has records of all official rain gauges throughout Anoka <br />County. The monthly precipitation totals and county -wide monthly averages for Anoka <br />County are available online at: <br />http://climate.unm.edu/HIDENannual/ <br />The two closest high-density rain gauges are: <br />1. No. 211785, Coon Creek <br />2. No. 217308, Saint Francis <br />Information is readily available from 1971 to the present. Over this time period, the <br />aggregate annual precipitation ranged as follows: <br />Lowest annual precipitation 16.5 inches in 1976 <br />Highest Annual Precipitation 39.09 inches in 1983 <br />Average Annual Precipitation 29.54 inches per year <br />The following is the average annual precipitation per decade: <br />1970s 26.8 inches per year <br />1980s 29.9 inches per year <br />1990s 31.2 inches per year <br />2000s 29.6 inches per year <br />2010s 29.2 inches per year <br />On the average, June is the wettest month, followed by July and May. <br />B. General Geology and Topographic Data <br />The City of Ramsey is nestled between the Rum and Mississippi Rivers and within 2 <br />miles of the confluence of these rivers. The general terrain is relatively flat and is often <br />called the Anoka Sand Plain. The elevations range from approximate elevation 920 feet <br />above mean seal level in northwestern Ramsey to near 840 feet at the lower Rum River. <br />The straight-line distance between these points is approximately 60,000 feet, making the <br />average slope less than 1 percent. In general, the land slope is in the 2 to 5 percent range. <br />Section IV <br />February 20, 2015March 6, 2015 Page 13 <br />