2021-07-22_REVISION - M2010071 (6)

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Design Report Goose Haven Reservoir Cell 2A May 14, 2021 Page 4 of 7 5 HYDROLOGY Section 6 of the Project Breach Inundation Mapping Report discusses of the inflow hydrology parameters and modeling. Section 7 of the Project Breach Inundation Mapping Report describes the hydrologic hazard evaluation and concludes that a Low Hydrologic Hazard classification is appropriate. 6 HYDRAULICS Section 2.3 of the Project Breach Inundation Mapping Report discusses the primary outlet for Cell 2A. Additionally, an overflow rating curve and a primary outlet capacity curve are provided on sheet HS-64 of the Project Construction Drawings. 7 GEOTECHNICAL DESIGN Geotechnical design considerations are discussed in the Project Geotechnical Design Report, The Project Geotechnical Design Report includes: • A discussion of the geology and subsurface conditions • Embankment foundation considerations • Seepage analysis of the proposed embankment • Slope stability analyses of the proposed embankment • Filter compatibility design for the embankment chimney, blanket, and toe drains, and the outlet pipe filter diaphragm. • Discussion and analysis for the embankment camber design • Embankment slope protection design • Dam freeboard analysis • Recommendations for trenchless construction for the outlet pipe 8 STRUCTURAL DESIGN The basis of design for the transfer box structures is described on the first page of the Transfer Box Structural Engineering Calculations. 9 INSTRUMENTATION PLAN Instruments will be used to monitor the performance of the dam over time. In accordance with the Rules and Regulations, Low Hazard dams are required to have seepage measurement devices and a gage rod. Specification Section 31 23 20 contains requirements for the seepage measurement and the gage rod. Seepage will be measured at the Flow Measurement Structure shown on sheet C-13 of the Project Construction Drawings. Sheet C-13 shows two toe drain outlets; one outlet will connect to the eastern embankment toe drain and the second outlet will connect to the western and northern BRIERLEY ASSOCIATES Creating Space Underground