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<br />Mappin~ and Surveys <br /> <br />CHAPTER II <br />INTERPRETATION AND USE OF REPORT DATA <br /> <br />Contour mapping for the study was provided by the Town of Elizabeth <br />and Elbert County. The ori&inal mapping, wlth a contour int<<rvalof 2 feet <br />andascaleofl inch equal to 100 feet, Wasconlpiled ,n1975. Since 1975, <br />new development hQS occurred within the study area in the Town of Elizabeth. <br />The Colorado Water Conaervation Board provided additional field survey. for <br />a number of cross section. within the study reaches. This information was <br />used to revi~e the contour mapping, where necessary. A recent aerial photo- <br />&raph,dotedJl1nell, 1979,wasalseusedtoupdatethe land use information. <br /> <br />Fluod Frequency Qnd DisCharge <br /> <br />This report was prepared to be compatible with the H.B,l04l designation, <br />Federal In"uranc" Administration flood inaurance rate atLldie. and can be <br />.adopted by local governments for regulation purposes. The 10- and 100-year <br />flood events were used in the Running Creek anslysis and the 5-, 10-, 50-, and <br />lOa-year flood event" were used in the Elizabeth drainage study. <br /> <br />These flood events have a probability of occurrin& once in the number <br />of years indicated. For example, the lOO-year flood has a one percent chance <br />of being equaled or exceeded in .anyone given year. <br /> <br />Related Flood Studies <br /> <br /> Tho ~" important use of co, 10O-yca.r flood flow i, f., the description <br />of '"' floodplain and its hnd 0.0 regulation. The Colorado State statutes <br />consider co, IOO-year flood a" co, Houd even~ to be used '" designing and <br /> <br />A floodplain study for Kunning Creek was prepared for the Elbert County <br />Land Use AdministratiunAgency inJ<lly 1976, Information provided in the <br />st<ldy was revie..."d during the completion of th.is report. The hydrologic .tudy <br />for this report indicat"s that somewhat higher discharges for the same frequen- <br />cy flood. "'" likely. !)ocumentlttion for ~hc i"cr.."sed dischar,~es and the <br />resuleing expa"Jed floodplain is provided in the technical addendum. <br /> <br />protecting .all buildings and structures to be used [or human occupancy. The <br />IOO-year flood isnccepted nearly nationwide for these purposes. <br /> <br />Information concerning mOre frequent flood event. ia provided for use <br />by the TOWll <>f Eliznbeth for plnnning purposes. The designofrond. a.nd <br />drainagescructures,minorchannelimprovemencs, and the planningofrecrea- <br />tinnal facilities may all be based on floods smaller than the lOO-year flood <br />ma&nitude. A higher riSk of damage may be acceptable for design of these <br />")lpes of facilities. <br /> <br />Flood Elevations <br /> <br />"ater surhc,' elevalions ror the 10- ;'<oJ tOO-year (l""ds ullRunning <br />Creek and for the 5-, 10-, 50-. and lOa-year floods f.'r tile ni~ab"tll ",..jor <br />drsinae"w"y.canb"fOllndin fO<lrlocacion.within this r"port. Th"..,.locn- <br /> <br />-5- <br /> <br />-6- <br />