Data necessary to perform upstream river flooding hazard analysis (Section 5.3.3),
Data on dam and dam characteristics, such as that described in Section 5.5, necessary to evaluate its
resistance to the seismic loads and overtopping. These data include the material properties of the dam
and and abutment, characteristics of gates and other mechanical equipment which could affect the dam
Reservoir depth, length and storage elevation tables,
Manning's roughness coefficient, and top-width elevation tables for downstream cross sections,
For overtopping events the depth of overtopping at which failure occurs,
In the case of hydrologic events, an inflow hydrograph, and
Outflow characteristics for emergency spillway, outlets, and turbines.
5.3.5 Storm Surge
A. For sites located within regions that experience hurricanes or strong storm squalls and which are located close
to large bodies of water, data on surges associated with such storms shall be collected from available flood
B. For cases where no such data are available, data necessary to perform joint probability hurricane frequency
hazard analysis (e.g., Ho et al., 1987) shall be collected along with data on bathymetric characteristics of the
coastline (depth tables), tide levels, and local topographic data between the site and large bodies of water.
C. The data necessary to perform joint probability hurricane frequency hazard analysis are specified in Section
A. Tsunamis are ocean waves generated by vertical sea-floor displacements associated with large offshore
earthquakes. Such earthquakes may be those occurring close to a site or at great distances from a site. For
sites located near an ocean, seismic data shall be collected to assess the potential for off-shore earthquakes
which could create tsunami. Data collected shall include historical records of tsunami occurrence in the site
region. Should potential for tsunami exist, local topographic data between the site and the ocean shall be
collected and evaluated. Paleo data should be collected for sites containing facilities with SSCs in Performance
Category 4 in case of no historical records of tsunami available at the site.
A. Seiches are undulations of the surface of a body of water such as a bay, lake, or reservoir, set up by
interaction of the water body with seismic forces, winds, and atmospheric pressure. For sites located near
large bodies of water, seismic and meteorologic data shall be collected to assess the potential of creating seiche
effects. Should this potential exist, local topographic data between the site and large bodies of water shall be
collected and evaluated.