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<br />T. <br /> <br />LAWRENCE E. DEZMAN, P.E. <br /> <br />Hydraulic Engineer <br /> <br />Eagle River at <br />:Peterson Ranch <br /> <br />September 17, 1981 <br /> <br />I-ir. '{iilliaIl1 F'. StC4'1ton, F,c. <br />Actinic Assistant Section Chief <br />Flood Control &: Floodplain hanagement Section <br />001orado .rater Conservat1on Board <br />1313 Sherman Street <br />Denver, CO, 80203 <br /> <br />Dear Bill: <br /> <br />i"y client has asked me to pursue final resolution of a 100 year <br />flood discharge prediction and water surface profile, Attached <br />you will i'ind a revised stream gage analysis based on data in <br />Tables 6 end 8 in l",CB 'ELI which indicates a one hundred yero:: <br />flood discharge of 5600 cfs, a water surface profile (HEC-2 <br />swnmary printout), and floodplain flaps, The water surface <br />profile is based on lifJannin,:'s n values for channel and overbanks <br />of 0.045 and 0.080, resl'ecti vely. '~he lower end of the n value <br />range recommended by you to Lr, Sid Fox (letter dated 8/27/81) <br />was used to r..rcserve the actual. river regime. It has' been my <br />experience that mountain rivers flow through a series of control <br />sccticns interspersed among ;,:2 l..ater surface profiles. A discharge <br />of 5600 cfs with n values of 0.050 and 0.100 for channel and <br />overbank yields a F2,ter slxface profile which is entirely <br />subcritic&l. <br /> <br />I woule assume from our conversation today that you agree with <br />the findinGS of this study, ,.Ir, Sid }'ox is aware that you will <br />recei ve this letter on Friday and would appreciate a verbal <br />response as soon as pessi ble in addition to a "Ti tten reply, <br /> <br />Sincer ely, <br /> <br />ftWvV'U1/1-1!Z ~ <br /> <br />4AA. <br />J ,.{.,.t'!--V'-- <br /> <br />Lawrence E. ~ezmanJ P.~. <br /> <br />cc: Sid Fex <br />Richard Langston <br /> <br />16704 ....'lJ8.l:ov..:'rc';c, i.urora, CO 80013 (303) 751-6706 <br /> <br />\.,- <br /> <br />(~ <br /> <br />.-/ "\' <br />,- , <br />