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HomeMy WebLinkAbout15-3 - Drainage-Report-Modified_05-16-2018______________________________________________________________________________ BOZEMAN GATEWAY GRADING AND DRAINAGE PLAN Page 1 MODIFICATION TO GRADING AND DRAINAGE PLAN FOR BOZEMAN GATEWAY DEVELOPMENT BOZEMAN, MONTANA Prepared By: Morrison-Maierle, Inc. 2880 Technology Boulevard West P.O. Box 1113 Bozeman, Montana 59771-1113 Engineers: James A. Ullman, P.E. Mike Hickman, P.E. Date: May 16, 2018 File: 3638.009/040/0310 ______________________________________________________________________________ BOZEMAN GATEWAY GRADING AND DRAINAGE PLAN Page 2 A storm water design report was submitted with the original PUD application, as Section 34, “Drainage Plan.” The Grading and Drainage Plan report is attached including the exhibits. The associated appendices are not included for the fact that they changed during development of the individual sites within the PUD. All site plans submittals to date were approved following the (original and modified) PUD, and each site plan submittal included a site-specific drainage design report that is consistent with the PUD’s overall drainage plan. The modification to the PUD storm water design report or Grading and Drainage Plan, is the change to the boundaries of the minor basins. The minor basins became more defined as each site was designed. The attached Figure 1 shows updated, current PUD minor basin boundaries and detention/treatment facilities. Also included is a “Detention/Treatment Structures” summary table and a “Drainage Reports” summary table with building names and City of Bozeman file numbers for reference. The two tables are cross-referenced to each other. Figure 1, together with the previously approved PUD Grading and Drainage Plan and the site plan submittals located in the City’s files, makes up the current and full storm water design report for Bozeman Gateway PUD. N:\3638\009\DOCS\PUD\MINOR MODIFICATIONS\STORM WATER\DOCUMENTS\DRAINAGE-REPORT-MODIFIED_05-16- 2018.DOC SS SS SSSSSSSSSSSS SS SSSSWWSSWW SSSSSSSSSSWSSWWWW WWWWWW W W W W W W W WWWWWWWWWWWWWWWWWWWWWWWSSSSSSSSSSSSSSSS SSSSSS W SS WSS SS SS SS SS SS SS SS SS SSWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W WSScoSDMINOR BASIN 3AREA = 8.87 Ac.MINOR BASIN 1AREA = 5.22 Ac.MINOR BASIN 2AREA = 4.18 Ac.MINOR BASIN 5AREA = 1.35 Ac.MINOR BASIN 6AREA = 3.08 Ac.MINOR BASIN 4AREA = 2.14 Ac.MINOR BASIN 7AREA = 8.27 Ac.MINOR BASIN 8AREA = 0.80 Ac.MINOR BASIN 9AREA = 4.31 Ac.MINOR BASIN 10AREA = 0.92 Ac.MINOR BASIN 11AREA = 19.00 Ac.FIGURE NUMBER©PROJECT NO.DRAWN BY:DSGN. BY:APPR. BY:DATE:COPYRIGHT MORRISON-MAIERLE, INC.,2018N:\3638\009\ACAD\DRAINAGE-MSTR-2018.dwg Plotted by mike g. hickman on May/15/2018engineers surveyors planners scientistsMorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718406.587.0721www.m-m.net3638.009FIG.1BOZEMAN GATEWAYBOZEMANMONTANAMINOR DRAINAGE BASINSMARCH 2018 UPDATECJFMGHJAU03/2018SCALE IN010010020050FEETSTORMTECHSYSTEM 3-1STORMTECHSYSTEM 1DETENTIONPOND 1STORMTECHSYSTEM 2O.S .O.S .O.S .O.S .O.S .STORMTECHSYSTEM 5(FUTURE)STORMTECHSYSTEM 4(FUTURE)STORMTECHSYSTEM 6(FUTURE)STORMTECHSYSTEM 3-2STORMTECHSYSTEM 7STORMTECHSYSTEM 8STORMTECHSYSTEM 9-2(FUTURE)STORMTECHSYSTEM 9-1DRY WELL10-2DRY WELL10-1STORMTECHSYSTEM 11-1DETENTIONPOND 3-1DETENTIONPOND 3-2O.S .O.S .STORMTECHSYSTEM 10O.S .STORMTECH SYSTEM 11-2(CURRENTLY PROPOSED)