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FLORENCE, COLORADO (LMPP) FIELD NOTES JANUARY 23, 1991 Page 2 . FEMA aad Corps of Engineers are to agree on hydrology to be used for the following streams which are all tributary to the City of F1011~nce: aad whose floodplains aU overlap each other: . Chaanler Creek . Oak Creek . Coal Creek . Information pertinent to the City of Florence study: . There are 271 residents, a school aad a hospita11ocated within the Oak Cree:k 100-year floodplain (but not within the overlapped, floodplain). . Approximately $25 million in damages are exp<~cte<d, from a 100-year event. . Corps of Engin1eers has 1977 aerial study . There needs to be an agreement on Oak Crl"..ek HEC-2 cross se~ction aligmmmts before study proceeds.. . FEMA is to submit draft study to the City of Florence. The City is to design bridges (Corps of Engineers is to fund study). The City is ~D send the new bridge information to FEMA. . Several meetings will be held until all parties (City, Corps of Engineers, FEMA, CWCB and developer) agree to signing off 011 the following items: . Hydrology . Cross Section Aligrunents . HEC-2 Model . There will need to be agreement on where thl~ fil:ld survey cross sectiollil in main chIDme1 are located. All bridge openings will be: field surveyed as a part of lile LMMP study. . Larry Laag (C'NCB) waats few cross sections used in the HEC-2 model. Too many cross sections (:Quld give erroneous results. . Corps of Engineers are to provide cross section d~lta to FEMA: . Stream Stationing aad whole cross section daWI . FEMA to verify data . The topographilc maps have been checked (1 n = 100' with 2' contour intervals). . City of Florence is to provide benchmarks. . FEMA's consultant is to field survey bridge opcmings aad SO-feet ups:tream aad downstream of bridge openings. There are 4 bridgl~s on Oak Creek. We IDe to aSUffie that all bridges are in place. . No debris blockage is to be considered in the study.