8.1. SR 11-04-2013 - Laserfiche WebLink

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SECTION 2 2. LAND AND WATER RESOURCE INVENTORY 2.1. Location The City of Elk River(population 22,974)is located in Sherburne County roughly 34 miles northwest of Minneapolis. It is bordered by the City of Ramsey to the east,the City of Otsego to the south, Big Lake Township to the west, and Livonia Township to the north. U.S. Highways 10 and 169 and State Highway 101 are the three main arterial routes,as well as a station on the Northstar Commuter Rail line to downtown Minneapolis. Refer to Figure 1 for the location of Elk River as it relates to the Minneapolis-St. Paul Metropolitan area. 2.2. Regulatory Environment There are no watershed districts or water management organizations within Elk River and therefore are no regulations on development impacts on water resources that are regulated by such organizations. Land Development Activities within the City are regulated by other organizations including the Minnesota Pollution Control Agency,Minnesota Department of Natural Resources, Minnesota Board of Soil and Water Resources, Sherburne County, and potentially others. 2.3. Topography and Geology Surface water in Elk River generally drains toward the Elk River and ultimately into the Mississippi River.The City of Elk River has 2-foot contour interval topographic maps that cover the entire City and are based on 2011 LIDAR(Light Detection and Ranging)data.This LIDAR data can be further detailed down to half-foot contours.Additional available mapping includes various development plans and the Elk River,Minnesota USGS 10-foot contour interval topographic map. More information is available in the Sherburne County geologic atlas from the Minnesota Geological Survey. 2.4. Climate and Precipitation The climate within Sherburne County is described as a humid continental climate with moderate precipitation,wide daily temperature variations,warm humid summers and cold winters. The total average annual precipitation is approximately 28 inches,of which approximately one-third occurs in the months of June,July, and August. The annual snowfall average is about 45 inches and is equivalent to approximately 5 inches of water. Atlas 14 was published by the National Oceanic and Atmospheric Administration(NOAA)in 2013. Atlas 14 contains recently updated rainfall frequency duration data for Minnesota and the surrounding area. This data replaced Technical Paper 40 JP 40)that was published in 1961. In general,Atlas 14 contains significantly more rainfall data that results in an updated frequency duration and intensity probabilities. Atlas 14 identifies a rainfall event having a 99% chance of occurrence in a 24-hour period is approximately 2.5 inches in the City of Elk River. A rainfall event having a 1%chance of occurrence in a 24-hour period is approximately 7.0 inches. Site specific rainfall recurrence intervals from 1 year to 1000 years and durations from 5 minutes to 60-days can be obtained on the Surface Water Management Plan City of Elk River Section 2 WSB Project No.1992-030 Page-1