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I I I I I I I I I I II I I I I II I I I I This Technical Appendix supplements the report "Floodplain/Hydraulic Analysis Report for the Thornton Municipal Golf Course." It contains HEC-2 output files that were used to determine the majority of hydraulic characteristics used in the report. The following is a list of the HEC-2 output files and a brief description of their contents. Additional backup cross sections upstream of 1-25 are also included. GOLFE.HZ Existing conditions starting from UDFCD Cross Section 1570 and continuing upstream of 136th Avenue to Section 960+30. This run is used for the main channel water surface computations. The east side of Washington Street is found in file EAST.H2. The following events are modeled: 1. 2-year UDFCD flow of 3,650 cfs, started with normal depth procedures; 2. lO-year UDFCD flow at 5,620 cfs, started from Muller's FHAD WSELj 3. 100-year FEMA flow of 8,892 cfs, started with normal depth procedures, and 4. 100-year UDFCD flow of 11,190 cfs, started with Muller's FHAD WSEL. EAST.HZ This file models Section 937+60 to 953+00E along the east side of Washington Street. Flows are adjusted according to the flow distribution over Washington found in file GOLFE.H2. The 2-year, 10-year, 100-year FEMA, and 100-year UDFCD flows are modeled. GOLFE.HEC Existing conditions from 136th Avenue to Section 4020, upstream of 1-25. Section 1003+09 should be used to determine the water surface at the upstream side of 1-25. Sections 1090 to 4020 are from Greiner's FHAD, corrected to this study's datum. CHNBRP.HZ Improved conditions from Washington Street through 136th Avenue, including improved bridges at both locations. The improvements are shown in detail on Drawing No.2. The model is continued upstream until the 100-year water surface matches file GOLFP2.H2. A-I