CC WORKSESSION PACKET 01302018 - Laserfiche WebLink

Home Browse Search

CITY OF ST. ANTHONY VILLAGE WATER RESOURCES MANAGEMENT PLAN SECTION 2 Page 1 2. LAND AND WATER RESOURCE INVENTORY 2.1. Topography and Geology The City of St. Anthony Village is located in both Ramsey and Hennepin Counties. The City is bordered by the Cities of New Brighton, Roseville, Minneapolis, and Columbia Heights. The total area within the City is approximately 2.5 square miles. Glacial activity has created an undulating landscape within the City. According to the Bedrock Geologic Map and Bedrock Topographic Map of Ramsey and Hennepin County (Minnesota Geologic Survey 1992), the geomorphology of the City in the uppermost geologic formation is quaternary deposits. The unconsolidated quaternary deposits of glacial and post glacial material conceal a majority of the bedrock within the City. All of the bedrock formations are marine sedimentary rocks from the Early Paleozoic age when shallow seas covered southeastern Minnesota and the surrounding regions. The surface till is composed of a complex mixture of loamy sand and clay. The bedrock formations include St. Peter sandstone, Prairie Du Chein Group, Jordan sandstone, St. Lawrence and Franconia formations, and a small amount of Decorah Shale, Platteville, and Glenwood formations. Depth of the bedrock can vary from approximately 700 to 850 feet above sea level. Four aquifers are located within the City boundaries: the St. Peter Aquifer, the Prairie Du Chien- Jordan Aquifer, the Franconia-Ironton-Galesville Aquifer, and the Mt. Simon Aquifer. Additional geologic information for areas within the City can be found in the following plans: Ramsey County Geologic Atlas Hennepin County Geologic Atlas Rice Creek Watershed District Watershed Management Plan 2.2. Climate and Precipitation The climate within the Minneapolis/St. Paul metropolitan area 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 in this area is approximately 29 inches, of which approximately one-third occurs in the months of June, July, and August. The annual snowfall average is about 56 inches and is equivalent to approximately 5.6 inches of water. The 1-year rainfall event occurring over a 24-hour period produces approximately 2.47 inches. The 100-year rainfall event occurring over a 24-hour period produces approximately 7.42 inches. The 100-year, 10-day runoff is approximately 10.1 inches. This data was derived from the Atlas 14 report produced by the National Oceanic and Atmospheric Administration (NOAA). Additional climatological information for the area can be obtained from the State Climatologist website at http://climate.umn.edu/. 1-year event = 99% chance of occurring in a given year 100-year event = 1% chance of occurring in a given year 2.3. Soils The soils within the City generally have low infiltration rates and create a minimal susceptibility to ground water contamination. The hydrologic soil classification map is shown in Figure 6,