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Comprehensive Stormwater Management Plan Northeast Lino Lakes Drainage Improvement Project WSB Project No. 2929-79 Page 9 3 HYDROLOGIC AND HYDRAULIC ANALYSES The models used in the CSMP have been derived from the RCWD district-wide modeling efforts for Rice Creek. InfoSWMM models for Upper Rice Creek (URC), Hardwood Creek (HWC), and Clearwater Creek (CWC) (Figure 11, Appendix A) were refined to be divided along the boundaries of the study area (Figure 12, Appendix A). The hydrographs from the revised InfoSWMM models were incorporated into the Rice Creek unsteady state HEC-RAS model. The models used in the CSMP have been derived from the RCWD District-wide modeling efforts for Rice Creek. InfoSWMM models for URC, HWC, and CWC were refined to include the boundaries of the study area. The hydrographs from the revised InfoSWMM models were incorporated into the Rice Creek unsteady state HEC-RAS model. There are several interactions between the different models, Figure 1 highlights the model interactions, the following discussion attempts to clearly state the specific changes made to each of the received RCWD models. Figure 1. Hydraulic Model Interactions 3.1 Hydrology A total of 40 subcatchments from the three RCWD InfoSWMM models are part of the Northeast Lino Lakes CSMP. To compare the CSMP existing and proposed conditions directly, subcatchments along the CSMP boundary were required to be subdivided. The InfoSWMM and HEC-RAS models were updated to reflect this change, and the revised existing conditions modeling is discussed in detail by model below. For all the InfoSWMM models, the hydrologic inputs for the 40 subcatchments were revised based on recent land use data from the City of Lino Lakes, City of Hugo, and the Minnesota Land Cover Classification System (MLCCS) (Table 3-1). All areas were recalculated based on the GIS data and weighted curve numbers and depression storage were recalculated for all the subcatchments within the CSMP area as well (Table 3-2). Upper Rice Creek InfoSWMM Clearwater Creek InfoSWMM Hardwood Creek InfoSWMM Rice Creek HEC- RAS LEAVE3 LEAVE4 LEAVING_ SYSTEM2 J3MT_001 J3MT_001 PELTIER_LAKE Peltier Lake Stage Peltier Lake Stage Peltier Lake Stage