Appendix B–6 - Residents/Businesses/Highways at Risk
A major flood caused by a sudden breach of the dam is estimated to inundate Insert Number homes, Insert Number businesses, and Insert Number roadways. These homes and businesses (marked on the evacuation map) are located Insert Location of Identified Structures Relative to the Dam.
House/
business/road no.*
|
Resident/business/road
|
Address
|
Phone no.
|
Distance downstream from dam
(ft)
|
Travel time**
(hr)
|
Max water depth above first floor (ft)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* See Appendix B–4.
** Estimated time for breach wave (peak) to travel from dam to downstream locations
Basis for computation of evacuation area and flooding depths
Breach inundation study completed by Insert Name Here,
Hydraulic model used: NRCS TR-20 (routing); NRCS TR-60 (peak discharge); NRCS TR-66 (hydrograph); HEC-RAS
Model assumptions:
“Sunny Day” Breach (no inflow into the reservoir)
Water surface elevation in reservoir prior to breach = _______ (top of dam)
Total volume of breach hydrograph = ______ acre-ft
Height of water at time of breach = ______ ft
Peak breach discharge = _______ ft3/s
Downstream area defined by field surveys consisting of _______ cross sections and _______ bridge openings
Share with your friends: | 
