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I I , I I I I I I .. I I I I I I I #' I 9.7.01 Soil characteristics are also considered when developing erosion control plans. Special procedures for erosion and sediment control should be incorporated into all construction projects. The erosion control handbook published by Board of Water and Soils Resources (BWSR) includes recommended management practices. The Minnesota Pollution Control Agency (MPCA) published in 2000 a document titled Protecting Water Quality in Urban Areas, Best Management Practices for Dealing with Storm Water Runoff from Urban, Suburban and Developing Areas of Minnesota. which may be used for reference or its replacement document when it is approved. This manual can be found on the WEB at http://www.pca.state.mn.us/water/pubs/sw- bmpmanual.html. The Ramsey County Soil Erosion and Sediment Control Handbook (1989) may also be used for erosion protection guidance. Precipitation 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 is approximately 29 inches. The average annual snowfall is approximately 50 inches, which is equivalent to roughly five inches of water. Rainfall data for the Minneapolis - St. Paul metropolitan area is shown in Table 2. Table 2 Rainfall in Minneapolis - St. Paul Metropolitan Area (inches) Return 24-hour 12-hour 6-hour 3-hour 2-hour 1-hour 30 - 15. Frequency minute minute 1-year 2.3 2.0 1.7 1.5 1.4 1.2 0.9 0.6 2-year 2.8 2.4 2.1 1.7 1.7 1.4 1.1 0.7 5-year 3.6 3.1 2.7 2.3 2.2 1.8 1.4 1.0 10-year 4.2 3.7 3.1 2.6 2.5 2.1 1.7 1.3 25-year 4.6 4.2 3.5 3.0 2.8 2.3 1.9 1.4 50-year 5.3 4.6 4.0 3.4 3.1 2.7 2.1 1.5 100-year 5.9 5.0 4.4 3.8 3.5 2.9 2.4 1.7 The JOO-year, 24-hour rainfall and the average annual precipitation for the State of Minnesota is shown in Figure 3. The table and figure indicate climatological information found in the U.S. Department of Commerce, Weather Bureau Technical Paper No. TP-40. Another good resource for rainfall data is the Rainfall Frequency Atlas for the Midwest published by tbe Midwestern Climate Center and Illinois State Water Survey. A table from this resource can be seen in Appendix K. City of Arden Hills. Minnesota Local Water Resource Management Plan A,ARDEN0101.00 Page 11