Laserfiche WebLink
• • Recommendations to resolve any probl.ems that are identified during the independent QA/QC <br />review. <br />Appendix M may be downloaded from the FET/IA Flood Hazard Mapping Web site at <br />http://w~~l.fema. r~pdf%fhm/frm sg a~n.pdf <br />Activity 8 -~ Hydraulic Analyses <br />Responsible Mapping Partner: CWCB <br />Scope: CWCB shall perform hydraulic analysf,s as necessary for the detailed flooding sources identified <br />in Tabl~ 1-L The modeling will include the 1C~-, 2-, 1-, and 0.2-percent-annual-chance events based on <br />peak discharges computed under Activity 6. <br />Hydraulic analyses for approximate floodplain;~ as listed in Table 1-l, if applicable, will be performed <br />using automated routines or other methods as a.pproved by the CWCB. The analyses will be performed <br />for the 1-percent-annual-chance events. <br />CWCB shall use the cross-section and field dat;a collected under Activity 3 to perform the hydraulic <br />analyses. The hydraulic analyses shall be used to establish flood elevations and regulatory floodways for <br />the subject flooding sources. <br />CWCB shall use the FEMA CHECK-2 or CHE~,CK-RAS checking program to check the reasonableness <br />of the hydraulic analyses. To facilitate the indf,pendent QA/QC review under Activity 9, the CWCB shall <br />provide explanations for unresolved messages from the CHECK-2 or CHECK-RAS program, as <br />• appropriate. In addition, CWCB shall address all concerns or questions regarding Activity 8 that are <br />identifi~ed by FEMA/NSP during the independ~nt QA/QC review under Activity 9. <br />If GIS-based modeling is used, CWCB shall d~cument automated data processing and modeling <br />algorithms for GIS-based modeling and provide them to FEMA for review to ensure they are consistent <br />with the standards outlined above. CWCB shall document the digital datasets and provide them to FEMA <br />for appxoval before performing the hydraulic a~:~alyses to ensure that the datasets meet minimum <br />requirements. If non-commercial (i.e., custom~-developed) software is used for the analyses, then CWCB <br />shall provide full user documentation, technical algorithm documentation, and software to FEMA for <br />review before performing the hydraulic analyses. <br />Standards: All work under Activity 8 shall be performed in accordance with the standards specified in <br />Section 5 of this MAS. <br />Deliverables: Upon completion of hydraulic rr~odeling for the flooding sources listed above (See Actibity <br />8: Scope), CWCB shall submit the results to FLMA/NSP for an independent QA/QC review under <br />Activity 9. CWCB shall submit the results of the hydraulic analyses for the remaining flooding sources <br />for a final QA/QC review at the completion of this activity. In accordance with the TSDN format <br />describ~ed in described in Appendix M of Guidelines and Specifications for Flood Hazard Mapping <br />Partne~•s, CWCB shall make the following products available to FEMA: <br />• Digital profiles of the 10-, 2-, 1- and 0.2-percent-annual-chance water-surface elevations <br />representing existing conditions using the FEMA RASPLOT program or similar software, if <br />applicable; <br />• • Digital results of the approximate hydraulic analyses, if applicable; <br />Mapping Activity Statement No. 1Q: Montezurrta County 19 <br />Colorado Water Conservation Board <br />