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Table 2.1 - Average Monthly Precipitation — 1971-2016 Rainfall frequency estimates are used as design tools in water resource projects. Rainfall frequencies are summarized in the National Oceanographic and Atmospheric Administration's (NOAA) Atlas 14-Point Precipitation Frequency Estimates. Previously, Technical Paper No. 40 (TP-40) Rainfall Frequency Atlas of the United States (NOAA) (published in 1961) was used to determine rainfall frequency estimates. TP-40 was developed using available rainfall information from far fewer stations than exist today; in Minnesota, there are 110 daily observation stations used in TP-40 estimates, whereas there are 320 daily observation stations used in Atlas 14. In addition to the fact that Atlas 14 estimates rely on a denser data network than TP-40, the stations have a longer period of record, and regional frequency analyses and new spatial interpolation techniques are used in the Atlas 14 method. Table 2.2 lists rainfall frequencies from Atlas 14 estimates, for the Twin Cities area, applicable to the City of Mounds View. The data taken from Atlas 14 are solely based on historical rainfall events and are not an extrapolation of data trends to predict future events. Table 2.2 - 24-Hour Rainfall Depths and Frequency Recurrence Interval (yrs) TP-40 24-hr Rainfall Atlas 14 24-hr Rainfall 2.7 WATER RESOURCES This section provides an overview of the water resources in and around the City. Waterbodies classified by the Minnesota Department of Natural Resources (MnDNR) as Public Waters, as identified by the 2011 Public Waters Inventory (PWI), and wetlands identified from the City's 2006 Wetland Inventory are identified on Figure 2.4, and a listing of the PWI basin names and the corresponding basin name from this LSWMP are presented in Table 2.3. City of Mounds View 8 Local Surface Water Management Plan Stantec Project No. 193804166 Sta nte+c