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<br />location if it has either two phone lines, or at a minimum, if <br />the call-interrulpt option werEI added t.o the existing phone. <br />That way, calls could be placed to obse.:vers, the National <br />Weather Service, etc., withou<t missing an additional phone <br />message from the :flood warning ~:rage. <br /> <br />Once the firl3t alarm :Ls rec::eived, someone should go to the <br />EOC and coordinate the flood response from there. In addition <br />to phones, it malr be useful to have ra.dio cOlll1llunication with <br />flood watchers. Given the relatively long distances involved, <br />a high band radio may be required. As noted in Appendix A, it <br />is recolll1llended that someone in sterling should go to the gage <br />after the first lllarm is sent and start recording staff gage <br />readings. Infolcmation recebl'lad in Crook from the visual <br />observer in Sterling will help insure that the alarm was <br />sounded correctly and will provide information as to when <br />intermediary critical threshol'j. discharges are reached. For <br />example, when the discharge reaches 10,000 cfs at Sterling, <br />overtopping of Highway 55 downs.tream near Crook could occur <br />within as little ,as 10 hours (fle'e Appendix A) . <br /> <br />4.2.4.2 Important Phone Nwnbers <br />A list of .important phone numbers should be developed <br />and posted in the EOC. Numbers '~n that list would include the <br />National Weather Service in r,i.mon and State and Local law <br />enforcement agencies. The lil:;t: must be checked and updated <br />periodically. All indivi.duall:; and agencies recorded on the <br />phone list should be infol."lDed of' the flood warning system and <br />their role during a flood emerglmcy. <br /> <br />4.3 component Parts of an Alan:m Gage <br />The followil1lg lists detail the parts that have been used <br />by the Omaha District to build the flood alarm gages. This <br />list is not chiseled i.n stone and better and cheaper <br />substitutes may be available for some of the parts. The <br />listing of speci:Eic brand names and vendors is intended as a <br />guide and is not an endorsement cof thOSEI companies an.d pr.oducts <br />by the Omaha District. <br /> <br />4.3.1 Gage and Shelter <br />1. Stilling Well - Use Corrugated Metal Pipe (CMP) <br />roughly 10 feet long. <br />a. Have a cleanout door and frame fabricated out <br />of 3/16" steel. Locate the cleanout door so <br />that it will be above ground when the bottom is <br />buried in concretEI. <br />b. Use a pipe collar to joln the stilling ~'ell to <br />the lid. <br />c. A padlock will be needed to lock the cleanout <br />door. <br />d. CMP can be as li.tt:le as 18 inches in diameter if <br />the elevati.on of' the floats mounted inside are <br />far from orle anclther, i..e. the upper and lower <br />floats are spacEld 2.5 fElet or more apart. All <br /> <br />1.5 <br />