Laserfiche WebLink
<br />various locations during the flood dE,~:cent, DurinCj the cloudbu:cst <br /> <br /> <br />flood of July 27, 1914, the loss was e"Limated at about $250,000, <br /> <br /> <br />one life was lost and many people were badly injured. 1'he flood <br /> <br /> <br />which occurred in 1969 was not as destLlcl:ive as the one in 1911 <br /> <br /> <br />and was confined to ,the western part of 'I:own. Again, lTIud and <br /> <br /> <br />debris flows were the principal factor, <br /> <br />FLOOD FLOW FREQUENCY ANALYSIS <br /> <br /> <br />Hydrologic analyses were carried Oll't to establish the peak discharge- <br /> <br /> <br />frequency relationships for floods of 1:1-,,', selec'ted recurrence in-. <br /> <br /> <br />tervals for each stream in the study area. Since most of i:he study <br /> <br /> <br />areas are ungauged, a reCjional relationship relating' basin area to <br /> <br /> <br />peak discharge was the principal method lwed. Gauging stai:ions <br /> <br /> <br />within hydrologic area No. 10 of flood-'frequency region B (Figure 3) <br /> <br /> <br />were used to establish the regional relationship. The method developed <br /> <br /> <br />by t.he United States Water Resources Council (R,eference 8) "Ias used <br /> <br /> <br />to dei:ermine the flood flow frequency :::elationship based on log~ <br /> <br /> <br />Pearson Type III Distribution for each selected gauging sta'lion, <br /> <br /> <br />Gauging stations used for developing Ule regional relationship w,~re <br /> <br /> <br />selec1:ed according to the criteria of [J) stations which have 10 <br /> <br /> <br />or more years of record and (2) statim'!": where peak flows are not <br /> <br /> <br />affeci:ed by regulation and diversion. The locaitions of selected <br /> <br /> <br />(jauging st.ations are shown in Figure 3, Stream gauging stat:ions <br />used are listed in Table 1 on the follO\"ing page. <br /> <br />Since the annual peak discharges published in the U.S. Geo],ogical <br /> <br /> <br />:3urvey's Water Supply Paper (Reference 3,4, and 5) andlh", U.S. <br /> <br /> <br />Geological Survey's Surface Water Record,3 (Reference 6) were a mixture <br /> <br /> <br />of flood flows' 'caused by snowmelt and ):'clinfall events, the reqional <br /> <br />-4-- <br />