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HomeMy WebLinkAbout09-14-20 Drainage and Flooding Committee Meeting JAY MARTINCHUCK ENGELKEN Chairman Member STEVE GILLETT DANNY EARP Alternate Member Vice-Chairman MINUTES OFTHEDRAINAGE AND FLOODING COMMITTEEMEETING AUGUST10,2020 The Drainage and Flooding Committeeof the City of La Portemet on Monday,August10,2020, at the City Hall Council Chambers, 604 West Fairmont Parkway, La Porte, Texas, at 5:00p.m. to consider the followingitems of business: Committee Members present:Jay Martin, Chuck Engelken, Danny Earp Committee Members attending remotely: None Committee Members absent:None Council-appointed officers present:Corby Alexander,City Manager; Lee Woodward, City Secretary 1. CALL TO ORDER-Chairman Martin called the meeting to order at 5:00p.m. 2. CITIZENCOMMENT (Generally limited to five minutes per person, in accordance with state law, the time may be reduced if there is a high number of speakers or other considerations.) There were no citizen comments. 3.STATUTORY AGENDA (a)Presentation, discussion, and possible action to approve the July13, 2020, meeting minutes. \[Jay Martin, Chair\] Committee member Engelkenmoved to approve the minutes;Member Earp secondedthe motion and it was adopted, 3-0. (b)Presentation, discussion, and possible action regarding changes to drainage criteria recommended by Harris County.\[Lorenzo Wingate, Assistant Director of Public Works\] Mr. Wingatediscussedthe new Harris County requirements and their potential impact on the City (chart from packet below). Alisa Max, P.E., Chief Operations Officer, Harris County Engineering Dept., answered questions from the Committee. Member Earp asked that the City requirement for detention for the entire property size be brought back for consideration. Mr. Wingate noted that Harris County has offered to have their consultantcome to La Porte to provide impactanalysisto show how the Harris County proposed changescompare to current City requirements. August10,2020-Drainage and Flooding Committee Minutes IğƩƩźƭ /ƚǒƓƷǤ wĻƨǒźƩĻƒĻƓƷLƒƦğĭƷ Ʒƚ \[ğ tƚƩƷĻ Minimal impact. Systems are Atlas 14 rainfall rates to size storm water designed using current rainfall conveyance and detention systems characteristics. Increases detention volume 0.55 ac-ft/ac detention rate requirement by 22%. Prohibit detention design using hydrograph Minimal impact. Rarely used for timingdesign in COLP. No net fill in the current 500-yr floodplainTo be explained by HCFCD/EHRA. Finished floor elevation established at or To be explained by HCFCD/EHRA. waterproofed to the 500-yr flood elevation (c)Presentation, discussion, and possible action regarding prioritization of current and future drainage projects.\[Lorenzo Wingate, Assistant Director of Public Works\] Mr. Wingateprovided a list of current projects for the Committee to prioritize or add to. The current list is: PriorityProject NameProject Phase (% Complete)Total % Complete 1Brookglen Drainage ImprovementsFeasibility (0%)0% Bayside Terrace Drainage 2Feasibility (85%)30% Improvements 3F101-06-00 ImprovementsPreliminary Engineering (25%)25% 4Little Cedar Bayou (F216) Phase 3Preliminary Engineering (0%)10% th 6Street (North Side Neighborhood 5Design (5%)5% Drainage Improvement Project) Southside Neighborhood Drainage 6Final Design (90%)60% Improvements; 7Project Complete100% Mr. Wingate noted Bay Colony has basically been dealt with since the list was put together and the Committee agreed to flip the order of Mission Drive and Sylvan Beach on the remaining list(below), thereby prioritizing additional drainage projects for future consideration. Project NameProject Background Priority This would be a continuation of previously completed drainage improvements along the Battleground Estates F101-00-00 drainage channel to mitigate flooding 8 Phase IInorth of N P Street with the Battleground Estates subdivision. Project is prefunded; $65,000 for preliminary design. Several complaints received about street flooding Roseberry Drive Drainage along Roseberry. The Drainage Committee 9 Improvementsconsented to further evaluation of the Roseberry drainage system at the August 12, 2019 meeting. Mission Drive Drainage Storm sewer system within Monument Estates 11 Improvementssubdivision holds water because conveyance August10,2020-Drainage and Flooding Committee Minutes channel between N P and N L has not been maintained. Subdivision do not have roadside ditches or Sylvan Beach Subdivision enclosed drainage system. All drainage is 10 Drainage Improvementsconveyed along street surface. Roadway is flooded during moderate rain events. Bay Colony Subdivision Inconsistent pipe sizes and elevations create N/A Drainage Improvementsrestrictions within the drainage system. (d)Presentation, discussion, and possible action in connection with receipt of a report regarding the plans relating to flooding in the City of La Porte.\[Lorenzo Wingate, Assistant Director of Public Works\] William Conlan of Lockwood, Andrews, & Newnam, a consultant for Harris CountyFlood Control District, andproject manager for the Galveston Bay Watershed Planning Project, discussed the completed evaluation and remaining challenges for related to the F212-00-00 channel. (e)Presentation, discussion, and possible action regarding the status of current drainage projects. \[Lorenzo Wingate, Assistant Director of Public Works\] Mr. Wingatereferred to status changes on several projects.He said he was waiting onproposalsfor Little Cedar Bayou Phase III and Battleground Estates Phase II,and that a notice to proceed would be issued tomorrow on the airport project. (f)Presentation, discussion, and possible action to provide staff with direction, if necessary, regarding additional drainage concerns. \[Lorenzo Wingate, Assistant Director of Public Works There were no additional items. 4. Set next meeting-The next meeting datewas set forSeptember 14, 2020. 5. Committee Member CommentsThere were no comments. ADJOURNThe meeting was adjourned without objection at 5:50p.m. ____________________________________ Lee Woodward, City Secretary August10,2020-Drainage and Flooding Committee Minutes REQUEST FOR DRAINAGE& FLOODINGCOMMITEEAGENDA ITEM Appropriation Agenda Date Requested:September 14, 2020 Requested By:Lorenzo Wingate, Asst. Director Source of Funds: Department:Public Works Account Number: Amount Budgeted: ReportResolutionOrdinance Amount Requested: Budgeted Item:YesNo Exhibits: SUMMARY & RECOMMENDATION Harris County has recommended that the City update its detention rate to become consistent with Harris - 0.20 acre-ft/acre (0-1 acre); 0.45 acre-ft/acre (1-10 acres); per HCFCD criteria (10+ acres).Changes to subsequent Council approval of the respective changes. Staff recommends a consistent detention rate for all development, not contingent upon development size. Additional consideration should be given to potential adverse impacts of not detaining at a rate not to exceed the pre-development flow rate and capacity of the receivingsystem. ACTION REQUIRED BY DRAINAGE AND FLOODING COMMITTEE Receive report, and provide staff with direction, as necessary. Approved for Drainage CommitteeAgenda Corby D. Alexander, City ManagerDate REQUEST FOR DRAINAGE & FLOODING COMMITEEAGENDA ITEM Appropriation Agenda Date Requested:September 14, 2020 Requested By:Lorenzo Wingate, Asst.Director Source of Funds: Department:Public Works Account Number: Amount Budgeted: ReportResolutionOrdinance Amount Requested: Exhibits:Project map Budgeted Item:YesNo Project update chart Harris County Drainage Network Map SUMMARY& RECOMMENDATION Refer to attached exhibit(s) for updates on various drainage projects throughout the City. ACTION REQUIRED BY DRAINAGE AND FLOODING COMMITTEE Receive report, and provide staff with direction, as necessary. Approved for Drainage CommitteeAgenda Corby D. Alexander, City ManagerDate The City of La Porte Drainage Projects 2019 ´ 3 ! ( 9 ! ( 4 ! ( 8 ! ( 5 ! ( 10 ! ( 7 ! ( 6 ! ( 1 ! ( 2 ! ( NUMBERPROJECT 1Brookglen Flooding Mitigation Analysis 2Bayside Terrace Drainage Improvements 3Lomax/F101-03-00 Drainage Channel Feasibility Study 4Little Cedar Bayou F216 Phase III Improvement 56th Street Madison to Main Paving and Drainage 68th & D Storm Water Conveyance Improvements 7Bob's Gully 8Little Cedar Bayou F216 Phase II Improvements 00.512Miles 9Coupland Drive 10Airport On-site Drainage Improvements REQUEST FOR DRAINAGE & FLOODING COMMITEEAGENDA ITEM Appropriation Agenda Date Requested:September 14, 2020 Requested By:Lorenzo Wingate, Asst. Director Source of Funds: Department:Public Works Account Number: Amount Budgeted: ReportResolutionOrdinance Amount Requested: Exhibits: Budgeted Item:YesNo SUMMARY & RECOMMENDATION Receive report regarding Harris County Flood Control District(HCFCD)and Harris County current and future plans relatedto flooding in the City of La Porte. ACTION REQUIRED BY DRAINAGE AND FLOODING COMMITTEE Receive report, and provide staff with direction, as necessary. Approved for Drainage CommitteeAgenda Corby D. Alexander, City ManagerDate Galveston Bay Watershed Planning Project City of LaPorte Drainage Committee Meeting (August 10, 2020) Problem Area 2 (N+6) F212-00-00 & F210-00-00 Content: Source of Flooding Possible Flood Mitigation Projects Constraints & Opportunities Damage Reduction Metrics and Costs Recommendations 2 3 PROBLEM AREA:N +6 Sources of Flooding Existing Conditions (100-YR) 1 1 1 1 F212-00-00 & F210-00-00 1 2 2 2 Likely Cause 1 Undersized Culvert 2 Undersized Trunk-line Flood Risk 1 Riverine Flooding Sheet Flow to Southeast 2 Sheet Flow to Northeast 3 Metrics (100-YR) Structures (total)70 Roadway (mi.)1.79 3 Floodplain (ac.)100.9 PROBLEM AREA:N +6 Sources of Flooding Existing Conditions (100-YR) F212-00-00 & F210-00-00 Video 4 PROBLEM AREA:N +6 Possible Flood Damage Reduction Projects Alternative D (Recommended) Channel Improvement + Box Culvert Replacement Channel Improvement: N Broadway St to N Utah St Deepening, 4:1 side slope Box Culvert Replacement: N Utah St to East E St ItemCost Construction$3,433,100 culvert ROW$150,000 Engr. Design$755,400 5 Total$4,339,000 3 PROBLEM AREA:N +6 Sources of Flooding Existing Conditions (100-YR) 1 1 1 1 F212-00-00 & F210-00-00 1 Damage Reduction (total) 2 2 TypeExistingProposedReduction 2 TPASF501993193 Structures70070 Roadway (mi.)1.790.121.67 Floodplain (ac.)61.953.28.7 6 PROBLEM AREA:N +6 Sources of Flooding Proposed Conditions (100-YR) F212-00-00 Damage Reduction (total) TypeExistingProposedReduction TPASF501993193 Structures70070 Roadway (mi.)1.790.121.67 Floodplain (ac.)61.953.28.7 7 F212-00-00 RECOMMENDED IMPROVEMENTS -ALTERNATIVE D OPINION OF PROBABLE COST GROSS COST PROBLEM AREA:N +6 ITEM NAMEQTYUNITUNIT COST (USD.) Probable Costs DEMOLITION REMOVE STR BOX CULVEA. 11$5,844.92$64,300 Alternative D (Recommended) REMOVE STR DRIVEWAY CULV EA.7$736.42$5,200 (5 Along Idaho St. & 2 Along Main St.) RELOCATE ELECTRICAL SERVICESEA 11$2,439.86$26,900 REMOV STR (BOX CULVERT)LF.3,000.00 $47.94$143,900 ROAD & CROSSING IMPROVEMENTS FULL -DEPTH REPAIR CRCP (8")SY 458.33$237.17$108,800 BOX CULVERTS -2 (8 FT X 5 FT) BOX LF.$570.05 3,600.00 $2,052,200 CULVERTS @ 1,800 LF. DETENTION PONDS 1 EXCAVATION (CHANNEL) CY. 10,137.00 $11.80$119,700 REMOV STR (MANHOLE)EA 2$460.12$1,000 ROW ACQUISITION & TRAFFIC CONTROL TRAFFIC CONTROLMO 6$2,500.00$15,000 EROSION CONTROL MEASURESMO 6$1,000.00$6,000 MOBILIZATION & START UP%5-$127,200 CONTINGENCY% 30-$762,900 TOTAL CONSTRUCTION COST $3,433,100 ROW ACQUISITION & TRAFFIC CONTROL ROW ACQUISITION (2.5 ACRES TOTAL)LS.2.5$60,000.00$150,000 TOTAL ROW COST $150,000 DESIGN PHASE SERVICES ENGINEERING / SURVEYING / GEOTECH%12-$412,000 CONSTRUCTION MANAGMENT / % 10-$343,400 PERMITTING 8 TOTAL ENGINEERING COST $755,400 TOTAL PROJECT COST$4,338,500 REQUEST FOR DRAINAGE& FLOODINGCOMMITEEAGENDA ITEM Appropriation Agenda Date Requested:September 14, 2020 Requested By:Lorenzo Wingate, Asst. Director Source of Funds: Department:Public Works Account Number: Amount Budgeted: ReportResolutionOrdinance Amount Requested: Budgeted Item:YesNo Exhibits: SUMMARY & RECOMMENDATION Opportunity to discuss any drainage concerns not covered by previous items. ACTION REQUIRED BY DRAINAGE AND FLOODING COMMITTEE Receive report, and provide staff with direction, as necessary. Approved for Drainage CommitteeAgenda Corby D. Alexander, City ManagerDate