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I I I I I I I I I I I I I I I I I I I CDM CAMP DRESSER & McKEE INC. CAMP DRESSER & McKEE INC. environmental enginefKs. scientists. pJanners, & """"'_ c;ons'-'ts Writer's Tower, Suite 1100 1660 South Albion Street, Denver, Colorado 80222 303 758-4351 Mr. L. Scott Tucker Executive Director November 5, 1979 Page 2 October 31,1979 The channel improvements between the Denver Water Board property and Colorado State Highway 121 should be undertaken next to further reduce flood stage along Marston Lake and Marston Shores. Mr. L. Scott Tucker Executive Director Urban Drainage and Flood Control District 2480 West 26th Avenue Suite 156B Denver, Colorado The improvements downstream of Quincy Avenue should be a third priority. The improvements upstream of Colorado State Highway 121 should be undertaken when development occurs. Marston Lake North Phase B Report CDM 611-6-RT We wish to acknowledge with thanks the cooperation and assistance of Mr. Ben Urbonas of your staff, ~1r. Nick Skifalides and ~1r. Joe Barsoom of the City and County of Denver, and Mr. Gary Bishop of the Denver Water Department in preparing this Master Plan for the Marston Lake North drainage basin. Very truly yours, WSL/lat APPROVED: \\\\\\\HI!!/f.lI1!/111 "" LJE"c .111;. #....-"sp .I\j "/ I.; ~ ~(.\''''' "''',G~'''O~" '-<J ~ ~_,V'"'~t0\;,)TE')3'''o11' ~ ~ "::::-.fij~ o..() ~ g : eel ~ ~ .1J 0:. :::; i1;*b 12300 w~ !r~ ~:~~ -' J:/])g ~"'\edO'('S, c?: o~ ~ CI S ",-';-0 Q ~ ~"'1/"O:()NAL \"o"~ '?";~ ~ & ".cu.o'" 00 # ~IIII. 0 F CO\..- \\\\,,'V. 11/IIIII/llllil\\\\\\\: Dear Mr. Tucker: In compliance with the terms of our contract with Urban Drainage and Flood Control District, dated ~.lay 15, 1978, \'ie have prepared a'pre- liminary design report for the Marston Lake North Drainageway ~1aster Plan. This report includes a further examination of the alternate plan recommended in Phase A, and a drainage and flood control pre- liminary design for the selected alternate plan in sufficient detail for planning and proceeding with final design plans and specifications. The selected plan includes channel improvements of various design frequencies, underground conduits, box culverts, and a sedimentation pond for water quality control. The estimated total cost of the ~1aster Plan Improvements is $3,748,000.00, which includes costs for land acquisition; engineering and contingencies, and fiscal, legal and administrative expenses. The present worth of the annualized operation and maintenance costs (50-year, 6-~%) is estimated at $95,700.00. A breakdown of these costs is presented with each of the plan and profile drawings. It is recommended that the initial construction effort be directed to open the saddles near the Marston Lake caretaker's house and the channel improvement in the Denver Water Board property. The most significant effect of the improvements will be the reduction of flood stage and the prevention of storm water entering Marston Lake. CAMP DRESSER & McKEE INC. tv;C4t--S~ ~ Wen-Sheng L~9 .~ Associ ate ,~~ DFFICIAL COpy Wayne Fi sher Senior Vice President COLORADO \'iATER CQrI!SERVf,TION BOARD 823 SFJE CENTEN:':lAL BUILDING 1313 S!iERMi\N STREET DEr~VER, COLORADO 80203 ,