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<br />velocity approllch ;;md the rule of thumb that flood waves travel <br />approximately L!i Umes faster than the average flow velocity. <br /> <br />5.2.2.2 Use of Volunteer Observers <br />Additional l..~a.d time can be obtained by having local <br />volunteers rea:d 1;l:<e staff gage and repo:r.t the rate of rise <br />following the 10wE,r stage alarm, or by calling people living <br />upstream to gE!t reports on rainfall and rh:es in the South <br />Platte. Any volunteer observers who have been helping Crook <br />detect floods in the past should be encoura'ged to continue <br />their important: "'clrk.. <br /> <br />5 . 2.3 Cooperat:ie,n with the National Weathe:t" Service <br />The National Heather Service has agree~ tC) provide current <br />radar-based racinf,all forecasts in exchaneje for a report of <br />flooding at the s}'stems that are already ':Jperational. It is <br />likely that a :silDilar arrangement can be Dlade with the Limon, <br />Colorado officE: of the National Weather Ser'ricE!. <br /> <br />5.2.4 ResponsE: to flood warning <br />Along with c.the,r information obtaine,:; b}/' volunteers, the <br />alarms can be USEtel t.o help malee the decision whether or not to <br />olose Highway 55. <br /> <br />5.2.4.1 Lower FlOclt Scenario <br />When a messagE' has been received from thE! gage announcing <br />that water has reached the lower float: <br />1. Note the time. <br />2. Call Olll;'~rvers located further up 1:he South Platte <br />River tel get rainfall and stream reports if you have <br />not alrea:dy received them. <br />3. Call t.lle National Weather Service in Limon. <br />Identify yourself as Crook, Colorado and let them <br />know when the alarm went off, thei1 ask for a rainfall <br />and river stage forecast for the South Platte River. <br />This will let you know if floodinq can be expect.ed to <br />worsen within the next few hours. <br />4. If v"lunl:eer and observer reports indicate that a <br />very large flood is coming (rive:r spreading out all <br />over the valley), activate all flood emergency <br />procedures without waiting for the upper float <br />alarm. 'Jrllis would be a jUdgment call for the flood <br />coordina1:or, but would provide a:l.di1;ional lead time <br />for erect.ing the closure structUl~es.. It would also <br />give residents in low-lying areas outside of the <br />levee and motorists more tima to evacuate the <br />threatened areas. <br /> <br />5.2.4.2 Upper Fl.'jat: Scenario <br />When a messal:Je :ls received from an UppEeI' float: <br />1. Noteth,~ t:lme. <br />2. compare the elapsed time betwean floats with the <br />times 9 !:\I~ll in Table 3. <br /> <br />22 <br />