Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
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PHASE A – ALTERNATIVES ANALYSIS REPORTMajor <strong>Drainage</strong>way Planning Update for Hidden Lake-Bates LakeMeeting MinutesHidden Lake – Bates LakeMajor <strong>Drainage</strong>way Planning UpdateThursday June 19, 2008, 2:00pm – 4:00 pm at UDFCDAttendees:Ken MacKenzie UDFCD 303-455-6277 kam@udfcd.orgShea Thomas UDFCD 303-455-6277 sthomas@udfcd.orgBesharah Najjar Adams County 303-453-8770 bnajjar@co.adams.co.usGeorgia Simpson City of Arvada 720-898-7646 gsimpson@arvada.orgJohn Burke City of Westminster 303-430-2400 x2126 jburke@ci.westminster.co.usRobert Krehbiel Matrix Design Group 303-572-0200 robertk@matrixdesigngroup.comTim Fairbank Matrix Design Group 303-572-0200 tim_fairbank@matrixdesigngroup.comJenn Newby Matrix Design Group 303-572-0200 jennifer_newby@matrixdesigngroup.com4. Benefit / Cost <strong>Analysis</strong>e. It is difficult to get a drainage improvement project to have a Benefit / Cost <strong>Analysis</strong> (BCA)ratio above 1.00.f. If the BCA ratios are not over 1.00 for proposed projects, describe the advantages <strong>and</strong>disadvantages of the proposed alternatives.5. Public Meeting : Wednesday June 25 th 6:30 – 8:00PMg. Matrix will provide a sign-in sheet <strong>and</strong> blank comment sheets.h. If the Draft <strong>Phase</strong> A <strong>Report</strong> is done in time for the meeting upload to the website <strong>and</strong> bring hardcopies for the local sponsors.i. Matrix will provide a large map of the entire watershed as well as maps of each of the reaches withalternatives identified.Purpose:a. Discuss Updated Baseline Hydrology <strong>Report</strong>b. Review Hydraulicsc. Review Updated <strong>Alternatives</strong>d. Review Preliminary Benefit Cost <strong>Analysis</strong>Near Term Schedule Upcoming Deadlinesa. June 25- Public Meetingb. June 25 – Draft <strong>Phase</strong> A <strong>Report</strong>c. July 9 – Comments Dued. July 23 – Final <strong>Phase</strong> A <strong>Report</strong>1. Updated Baseline Hydrology <strong>Report</strong>a. All of the project sponsor comments have been addressed in the updated Baseline Hydrology <strong>Report</strong>.b. Send updated Baseline Hydrology <strong>Report</strong> directly to sponsors.c. CUHP-SWMM files will be added to the CD’s.2. Hydraulicsa. <strong>Report</strong>s of floodingi. Overtopping of Sheridan.ii. Look into the building southwest of Grace Church.b. Remove Aloha Beach houses from the floodplain; the assumption was made that these were builtabove the 100-year floodplain.3. <strong>Alternatives</strong>c. Reach H-1i. Georgia provided the l<strong>and</strong> plan for the Arvada Center, the proposed detention pond at this sitewill be revised to avoid the proposed improvements.d. Reach H-3i. Re-evaluate the size of the proposed RCP in Lowell Blvd. with a Manning’s roughnesscoefficient of η=0.015.ii. Check with David Mallory to see if the open channel along the west side of Lowell Blvd. ison his maintenance eligible list.
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