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<br />from these !llustratlons. Typical cross sections of The flood pla!n <br />at selected locatIons, Together with the water surface elevatIon and <br />lateral extent of the Intermediate Regional and Standard Project Floods <br />are shown on Pji!ltes 28-29. <br /> <br />The Impact of floodIng Is not limIted to the flooded arei!ls. For <br />example, floodwaters may Interrupt or conTaminate water supply systems, <br />or break sewer mains thaT an entIre community depends upon, thus creatIng <br />wldesprei!ld InconvenIence and pOTential serious hazards to hei!llth. Flood <br />damage to power and communications facilities, or InterrupTion of natural <br />gas transmIssIon, ,"i!lY i!lffect i!lrei!ls outside those actui!llly flooded i!lnd <br />result In personi!lr discomfort i!lnd Inconvenience, cessation of commercIal <br />actlvltleS--i!lnd attendant loss of business and worker Income--and In <br />emergency siTuaTions very difficult to deal with due to lack of communi- <br />cation. Meeting the costs of emergency flood relief, flood fIghting, <br />other flood emergency activities, clei!lnup i!lnd the repair i!lnd restoratIon <br />of public fi!lcllltles di!lmaged or destroyed by floods has an Impi!lct that <br />far transcends the flooded areas as cIty, county, staTe, and Federal <br />tax revenues must be used for these actIvities, thus reducing revenues <br />available for other services, especially at the local level. Other <br />results of flooding that impact outsIde the areas flooded may also <br />Include closed schools and long term Inconvenience to the travelIng <br />publIc. <br /> <br />Identification <br /> <br />Red Butte Road <br />AbandonedRR <br />Mill Street <br />Neal Street <br />Cooper Avenue <br />Hemann Road <br />PrivaTe BrIdge <br />(North Star <br />RanCh) <br /> <br />Powerplant Road <br /> <br />Private Bridge <br />Red Mountain Road <br /> <br />Location <br />(bJ <br /> <br />42.59 <br />44.46 <br />44.63 <br />45.21 <br />45.54 <br />46.62 <br /> <br />46.98 <br /> <br />0.70 <br /> <br />0.04 <br />0.13 <br /> <br />TABLE 4 <br />OBSTRUCTIVE BRIOGES <br /> Elevation/a) <br /> Top of Inter- <br /> Under- Road- mad I i!lte $1'andard <br />Stream- clearance "Y Regional ProjeCT <br />'" (e) (oj "000 FlOOd <br />ROARING FORK RIVER <br />7702 7717 7720 7714 7716 <br />7825 7842 7843 7833 7834 <br />7838 7852 7854 7848 7851 <br />7887 7896 7897 7892 7893 <br />7929 7940 7943 7937 7939 <br />8013 8023 8026 8022 8023 <br /> <br />8018 8025 8026 8027 8029 <br />CASTlE CREEK <br />7826 7830 7833 7831 7832 <br />HUNTER CREEK <br />7822 7829 7831 7827 7829 <br />7832 7842 7844 7840 7845 <br /> <br />OllSTRUCTlONS <br /> <br />(a) Al/. eZevation8 =e rournied to the nea"",,,,t foot, mean sea tevel datWl1. <br />(b) Distance in mile", upstream fr'om mouth. <br />(0) Minimum eteV<;lticn. <br /> <br />Of the 11 bri dges crossing the Ro~r'"lng Fork RIver ~nd Castle and <br />Hunter Creeks In the study ~re~. 10 c~n be conslder'"ed obstructive to <br />floodflows. Pertinent data on these structures are cont~lned In Table 4. <br />As mey be seen from Plates 16-27, the effect of these obstr'"uctions Is to <br />raise the water surf~ce elev~Tlon upstre~m. Obstructr~e br'"ldges i!lnd <br />theIr ~pproaches ~re especl~lly susceptible to structuri!ll dam~ge due to <br />The forces of floodwi!lter and floating debr'"ls. The Salvation Canal <br />DIversion Dam i!llso r'"alses the wa~er surface elevation upstream during <br />high flow, but causes no damage because flow Is confined II". a n~rrow canyon. <br /> <br />VELOCITIES OF FLOW <br /> <br />Occurrence of an Intermediate Regional or Standard Project Flood <br />would result In the flows shown In Table 3. DurIng an Intermedl~te <br />Regional Flood, the average ~eloclty In the ~arlng Fork RIver below <br />SalvatIon Canal Diversion Dam would be about 10 feet per second. In <br />the meadow above the dam, velocity would be reduced to about 2 fee1' per <br /> <br />" <br /> <br />22 <br />