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<br />1::-., -I!f--'W' &= <br />..- ,,-", ..... <br />::,;:;:; ',..; --;:~-.. <br />I f ,.~""~~,..,,.~,-,",''''''~ <br /> <br />March 14, 1990 <br /> <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />I, <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />- <br /> <br />McLaughlin Water Engineers, Ltd. <br /> <br />- <br /> <br />2420 Alcott Stree~ Denver, Colorado 80211 (303) 458-5550 <br /> <br />Mr. William DeGroot <br />Chief, Flood Plain Management <br />Urban Drainage and Flood Control District <br />2480 West 26th Avenue, Suite 156B <br />Denver, Colorado 80211 <br /> <br />RONALD C. Md-"UCHUN <br />HALFORD E. ERICKSON <br />DOUGlJr.S T. sevERN <br />WILLIAM R. KENDALL <br />RALPH L TOREN <br />tERRENCE P KENYON <br />GEZA E. KMETIY <br />RIo YMONO W ST AOU.R <br /> <br />GENE A. BURllELt <br />MICHAEL E. MEJl.CER <br />JOHN M. PfUt.UM <br />MICHAEL R GAlUZZl <br />RONALD E. DVORAK <br />SCOTT E. LEHMAN <br />KENNETH D. ZlEBART <br />MARY ANNE BUSH <br />lIRIAN S_ KOLSTAD <br />R JAMES McLAUCHLJN <br />G_ DEAN DEROSIER <br /> <br />RE: Evaluation of and Design Recommendations for Drop Structures in the <br />Denver Metropolitan Area - Addendum and Errata <br /> <br />HAROLD ROBERTS <br />lACK W. STElNMEYER <br />LEANDER L URMY <br />DANIEL M. PETRAM........ <br /> <br />Dear Mr. DeGroot: <br /> <br />The three years since our original report have provided the opportunity to test many of the <br />recommendations cited therein. At the same time, the revised Hydraulic Structures Section of the <br />Urban Storm Drainage Criteria Manual (USDCM) was prepared, In the process, refInements and <br />improvements to the report have been completed, <br /> <br />This document is comprised of two parts: Addendum and Errata. The Addendum briefly addresses <br />design refinements and additional information useful in drop structure design,. The Errata is mostly <br />minor, although there are a few equations and figures that are important to correct. We have also <br />reissued the References with corrections and numerous additional citations that may be useful. <br /> <br />Sincerely, <br /> <br />Jt!d&J! ~~ <br /> <br />William C. Taggart <br /> <br />~t1 <br /> <br /> <br />Eric Stiles <br /> <br />Enclosures <br /> <br />EAS:mb <br />85-OS6.Q2X1 <br />EAS-l <br /> <br />ASPEN, CO <br />(303) 925.1920 <br /> <br />TULSA. OK <br />(918)66....27.1 <br /> <br />PHOENL'l:. AZ <br />(602)248-7702 <br /> <br />LAKE DILLON, co <br />(3031468-2141 <br /> <br />..~ <br />t;;,."", ENGINEERING SERVlCE5 IN, <br /> <br />WAT'ER JUCHTS AND RESOURCES WATER TREATMENT AND Dlsm8UT1ON <br />WAS~WA TER CO~N,. TREA Th4ENT AND REFL'SE RRE PROTECTION <br /> <br />SUBSURfACEDRAlNAGE IRRIGATION FOUNTAJNS <br />WATER 8ASED RECREA TlO!'l SPEOALTY H'VDRAL:UCS <br /> <br />STORM DRAINAGE AND FLOOD CONTROL <br />RATE sn.rD1ES AND lJTlT.ITIES ECONOMICS <br />