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<br />"': ')!"'\ 1 ('\ .. .'.- <br />l.JJ ':J: ~ c <br /> <br />:;. ..;~... ...rj' <br />.~ -9 ~... '.'-. '.' '...~ :~;..~ ....:/ <br />......, )' ~E~ . . .~.. . . \ ,S" ...,. <br />'~~. COv..,-,\' <br />'..,...; <br /> <br />I COMPLETE ENGINEERING SERVICES IN; w.....TER RIGHTS AND RESOURCES WATER TREATMENT AND DlSTRIBlITlON <br />WASTEWATER COLlECTlON, lltEATMENT AND REUSE FIRE PROTEcnON <br /> <br />I - <br /> - <br /> - <br />I - <br />- <br />- <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />.......".... <br />-' ,- <br />... - . - <br />- - - - <br /> <br />McLaughlin Water Engineers, Ltd. <br /> <br />. <br /> <br />December 8, 1986 <br /> <br />2420 Alcott SI., Denver, Colorado 80211 <br /> <br />(303)458-5550 <br /> <br />RONALD C McLAUGHLIN <br />HALFORD E ERICKSON <br />DOUGLAS T. SOVERN <br />WILLIAM C TAGGART <br />ROBERTL.CARLEY <br />WilLIAM It KENDALL <br />CHARLES L HARDT <br />RALPH L TOREN <br /> <br />Mr. William DeGroot <br />Chief, Flood Plain Management <br />Urban Drainage and Flood Control <br />2480 W. 26th Avenue, Ste. 156B <br />Denver, CO 80211 <br /> <br />District <br /> <br />IOHN T. McLANE <br />C;EN~A. BURRELL <br />MICHAEL E. MERCER <br />IOHNM. PFlAUM <br />MICHAEL R GALUZZI <br />RONALD E DVORAK <br />SCOTT E. LEHMAN <br />KEN:>;ETH D L1EtlART <br />MARY ANNE BliSH <br /> <br />Re: Agreement No. 85-05.03 <br />Evaluation of and Design Recommendations for <br />Drop Structures in the Denver Metropolitan Area <br /> <br />HAROLD ROBERTS <br />lACK W STEINMEnR <br />LEANDU< L. lIRM\ <br /> <br />Dear Bill: <br /> <br />We have completed the above mentioned project and completed our report for the <br />first phase of this project. We look forward to participating in the dialogue that <br />will follow from here. <br /> <br />We are especially pleased about the positive attitude of the many participants. All <br />realize that there are significant problems with many of the drops and that <br />improvements must be made. Just to emphasize and reiterate, one of the key <br />conditions under which this study was executed was not to criticize any design or <br />concept, but to objectively learn about various drop concepts, factually determine . <br />the situation and develop improvements to the various drop concepts. One immediate <br />action we recommend is an orientation away from Loose Riprap Drops toward drops <br />like Baffle Apron Drops, Vertical Hard Basin Drops and Sloping Grouted Rock Drops. <br /> <br />Five basic categories of drop types were formulated based on the field and office <br />evaluation, guidelines provided for each and economic evaluation completed. This <br />information should be useful to engineers considering different types of drops. <br /> <br />Thank you for the opportunit y to work on this project. <br /> <br />l\ltI""ftll <br />,\,\\~-~): S~t~:f!.' ':~..., <br />.<~i.: .~;~'.. . . ;:. :;:~:~\: <br />., ~ .. ./~ <br />. . <br /> <br />Very truly yours, <br /> <br />ttJ~C~ <br /> <br />William C. Taggart, P.E. <br /> <br />. <br />:} : <br /> <br />CASTLE ROCK <br />(,303)688-5599 <br /> <br />LAKE DILLON <br />(3031468-2141 <br /> <br />TULSA <br />(918)664-2741 <br /> <br />SUBSURFACE DRAINAGE <br />WATER BASED RECREATION <br /> <br />IRRIGATION fOUNTAINS <br />SPECiALTY HYDRAUUCS <br /> <br />STORM DRAINAGE AND FLOOD CONTROL <br />RATE STUDIES AND UTILITIES ECONOMlCS <br />