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Home My WebLink AboutCentral Resort District Drainage Improvements Engineering Report 05272025Central Resort District Drainage Improvements Preliminary Engineering Report City Council Update Mike Tippin, PE | May 27, 2025 Agenda 2 Background Selected Alternative Project Phasing Summary and Costs There are no decisions to be made today the intent of this presentation is to inform City Council and the public. Background 3 Central Resort District CIP Project Area 21st St Pacific AveArctic Ave24th St 19th St Baltic Ave17th St 4 Central Resort District Drainage Improvements (CIP: 100062) • New stormwater pipes, tide gate, pump stations, storage, and ocean outfall 24th St Culvert (CIP: 100061) • Replace small pipe with large box culvert • Improve conveyance at Old Virginia Beach Road and Parks Avenue 21st St and Baltic Ave Drainage Improvements (CIP: 100275) • Redirects stormwater to reduce flooding at 21st St and Baltic 1 2 3 1 2 3 Development History 5 1937 1958 Development History 6 1974 2024 Flooding – Rainfall Events 7 August 11, 2022 21st Street August 28, 2023 Flooding – Rainfall Events 24th Street Culvert 25th Street (Baltic/Med) 8 Flooding – Tidal Events Holly Road Arctic/Baltic/Beach Garden Park 9 Recurrent Flooding 21st StreetHurricane Sandy 21st Half Street and Baltic Ave Baltic Ave and 29th Street 10 Previous Studies 11 12 Design Criteria 100-year Level of Service Passable Roadways, Visible Crown Fully Contained in Storm System Critical Infrastructure Sea Level Rise Meet PW Design Standard to the maximum extent practicable 100-yr 10-yr No SLR 100-yr* 1.5 ft 10-yr 25-yr 50-yr 3 ft 25-yr 50-yr * Assume future flood gates installed at Lesner Bridge and Rudee Inlet, remove SLR for 100-yr checkstorms 3 ft SLR 21st & 22nd Streets (I-264) VB Convention CenterVB Convention Center Pacific Ave & Laskin RdPacific Ave & Laskin Rd 7.2 ft tailwater in Lower Little Neck Creek 4.3 4.7 5.4 5.4 7.2 7.2 Design Tailwater Draft PER Alternatives Overview VB Visitor Center MOCA MOCA/Parks Ave Old Beach Park Beach Garden Park 24th St Park 27th St Laskin Rd Tide Gate Project Area 21st St Pacific AveArctic Ave24th St 19th St Baltic Ave17th St 13 •Holistic Approach utilizing the same criteria as Stormwater Master Plans •7 Alternatives Evaluated •Focused on City-Owned Parcels •Outfalls •Atlantic Ocean •Little Neck Creek Selected Alternative 14 Ultimate Improvements •Laskin Road Culverts and Tide Gates •Parks Ave Pump Station •24th Street Culvert •24th Street Microtunneling •24th Street Park Pump Station •Channel Improvements (MOCA) •Other improvements •Storm system upgrades 15 Laskin Road Culverts 16 Laskin Road Tide Gate •Automatic tide gate on the north side of Laskin Road •Existing double 6’x6’ box culvert •Gate OPENS: Water elevation in Beach Garden Park ≥ Tailwater •Gate CLOSES: Tailwater ≥ 1.5 ft Allows for normal ebb and flow of ~ 60% of higher high tides 17 Parks Ave Pump Station 220 CFS CAPACITY Two (2) 60 cfs pumps One (1) 100 cfs pump 18 Parks Ave Pump Station 19 24th Street Microtunneling 21 22 Laydown Area and Bore Pit (mostly in 24th Street) Laydown Area and Bore Pit (mostly in 24th Street) 23 Captures Existing Storm Pipes Proposed Triple 78” Culverts in 24th Street Microtunneling Machine Captures Existing Storm Pipes Proposed Triple 78” Culverts in 24th Street Microtunneling Machine 24 25 “And all this happening below a fully functional road…” “And all this happening below a fully functional road…” 26 950 CFS CAPACITY Two (2) 100 cfs pumps Three (3) 250 cfs pumps 24th Street Park Pump Station – Ocean Outfall 24th Street Park – Alternative 1 28 29 Pump Control House, Visitor Center, and Park Facilities Generator House Generator House 30 Ocean Outfalls – Horizontal Direction Drill Ocean Outfalls – Horizontal Direction Drill Below Grade Wet Well Below Grade Wet Well Triple 78” Culverts Triple 78” Culverts 24th Street Culvert •Raise 24th Street to elevation 7.5 •Replace Existing 54-inch Culvert With 35’x6’ opening 31 24th Street Culvert 32 MOCA Existing Channel 33 MOCA Proposed 34 Project Phasing 35 Ultimate Program Improvements Estimated Construction Cost $386,200,000 36 Phase 1A – Laskin Road Culverts and Tide Gates 37 •Double capacity of Laskin Road culverts •Automatic Tide Gate on Laskin Road Culverts Improvements Estimated Construction Cost $8,900,000 Phase 1A – Laskin Road Culverts and Tide Gates 38 •Immediate, noticeable relief from dry weather tidal nuisance flooding at low-lying areas near Beach Garden Park •Kilbourne Ct, Holly Rd, 28th Street area Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A Flood ReliefFlood Relief 100-yr Flood Reduction Phase 1B – Parks Ave Pump Station Improvements •Parks Ave Pump Station (260 cfs) •Full size for Ultimate build-out •72-inch pipe on 23rd Street •Pipe improvements on Baltic & Arctic Ave between 21st & 23rd 39 Estimated Construction Cost $66,400,000 Phase 1B – Parks Ave Pump Station 40 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 72861.281.68TOTAL Flood ReliefFlood Relief •Contains 10-yr storm at 21st & Baltic Ave, 21st & Arctic Ave 100-yr Flood Reduction Phase 2A – 24 th Street Microtunneling Improvements •Microtunnel triple 78-inch trunk line on 24 th Street •Pipe improvements on Baltic & Arctic between 23rd & 24th •Connections on Pacific, north Arctic, north Baltic, and north Mediterranean inactive until later phases •Drains to Parks Ave pump station via backflow •Storage in system above -4 ft 41 Estimated Construction Cost $102,300,000 Phase 2A – 24 th Street Microtunneling Flood ReliefFlood Relief 100-yr Flood Reduction •Contains 10-yr storm on Baltic & Arctic south of 24th Street Significant cost savings if constructed at the same time as Phase 2B 42 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 75911.491.80TOTAL Phase 2B – 24 th Street Pump Station Improvements •24th Street Park pump station (950 cfs) & ocean outfall •Below-grade pump station •24th Street Park improvements •Bathroom facilities, information kiosk, stage, other amenities •Activate connections to side street systems installed in Phase 2A •Add final connections on Atlantic Ave 43 Estimated Construction Cost $119,800,000 Phase 2B – 24 th Street Pump Station Flood ReliefFlood Relief •Achieves passable road conditions on Baltic & Arctic between 21st & 24th Streets during 100-year storm •Water quality TMDL benefit from redirecting significant area away from the Chesapeake Bay 100-yr Flood Reduction 44 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 6981.210.362B 144992.702.16TOTAL Phase 3 – Arctic Avenue North Improvements •78-inch trunkline on Arctic Ave between 24th & 28th Street •Automatic weir gate on existing twin 90-inch outfall to Beach Garden Park •Prevent unwanted drawdown of BGP by the 24th Street pump station during dry weather •Misc. pipe capacity improvements 45 Estimated Construction Cost $22,700,000 Phase 3 – Arctic Ave North Flood ReliefFlood Relief •Allows Beach Garden Park to be drawn down by 24th Street Park pump station •Brings flood relief to 28th Street area •Expands passable road conditions during 100-yr storm 100-yr Flood Reduction 46 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 6981.210.362B 46460.970.683 1901453.672.84TOTAL Phase 4 – Parks Ave and Cypress Ave Improvements •Parks Ave pipe improvements to 19th Street •Cypress Ave pipe improvements 47 Estimated Construction Cost $26,200,000 Phase 4 – Parks Ave and Cypress Ave Flood ReliefFlood Relief •Creates passable roadways during 100-yr storm for critical infrastructure, 21st & 22nd Streets •Reduces flooding on 19th Street •Takes east branch of MOCA channel offline 100-yr Flood Reduction 48 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 6981.210.362B 46460.970.683 3260.850.504 2221514.523.34TOTAL Phase 5 – 24 th Street and MOCA Channel Improvements •Remove Old Virginia Beach Rd entrance to MOCA •Channel & floodplain improvements •Neighborhood pipe upgrades •Raise 24th Street to crown elevation 7.5 ft •24th Street culvert replacement with 35’x6’ opening •Additional culverts under I-264 49 Estimated Construction Cost $20,600,000 Phase 5 – 24 th Street and MOCA Channel Flood ReliefFlood Relief •Brings flood relief to Convention Center area •Reduces flooding in neighborhood west of MOCA •Channel & floodplain improvements increase storage capacity 100-yr Flood Reduction 50 Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 6981.210.362B 46460.970.683 3260.850.504 840.160.275 2301554.683.61TOTAL Phase 6 – Parks Ave and Mediterranean Ave 51 Improvements •Additional pipe improvements on Parks Ave south of 19th Street •Mediterranean Ave pipe improvements Estimated Construction Cost $19,300,000 Inset A Inset B Phase 6 – Parks Ave and Mediterranean Ave 52 Flood ReliefFlood Relief •Allows Virginia Beach Blvd to contain 10-year storm after redevelopment of trailer park •Reduces flooding near Mediterranean & 25th Street 100-yr Flood Reduction Structure Flooding # of Buildings Street Flooding Miles of RoadPhase 100-yr 10-yr100-yr10-yr 46410.641.031A 26450.640.651B 350.210.122A 6981.210.362B 46460.970.683 3260.850.504 840.160.275 020.090.076 2301574.773.68TOTAL Summary and Costs 53 10-year, with 1.5 ft SLR Flooding 54 Laskin Road Culverts and Tide Gates Parks Avenue Pump Station 24th Street Microtunneling 24th Street Pump Station Arctic Avenue NorthParks Avenue and Cypress Avenue 24th Street and MOCA Channel Parks Avenue and Mediterranean Avenue 10-yr Flood Reduction 55 Existing 10-yr Flood Baltic AveMed Ave22nd St Arctic AvePacific Ave19th St 100-year Flooding Laskin Road Culverts and Tide Gates Parks Avenue Pump Station 24th Street Microtunneling 24th Street Pump Station Arctic Avenue NorthParks Avenue and Cypress Avenue 24th Street and MOCA Channel Parks Avenue and Mediterranean Avenue 100-yr Flood ReductionExisting 100-yr Flood Baltic AveMed Ave22nd St Arctic AvePacific Ave19th St 57Baltic AveMed Ave22nd St Pacific Ave19th St Estimated Construction Cost 58 Estimated Total Project Cost: $577,000,000 Estimated Construction Cost with Escalation Escalation 5% / YR Estimated Construction Cost Stormwater Improvement ProjectsPhase $10.3 M$1.4 M$8.9 MLaskin Road Culverts and Tide Gates1A $83.4 M$17.0 M$66.4 MParks Ave Pump Station1B $135.6 M$33.3 M$102.3 M24thStreet Microtunneling2A $171.3 M$51.5 M$119.8 M24thStreet Pump Station2B $34.5 M$11.8 M$22.7 MArctic Avenue North3 $39.6 M$13.4 M$26.2 MParks Avenue and Cypress Avenue4 $31.9 M$11.3 M$20.6 M24thStreet and MOCA Channel5 $31.2 M$11.9 M$19.3 MParks Avenue and Mediterranean Avenue6 $537.8 M$151.6 M$386.2 MTOTAL: Summary 59 Estimated Total Project Cost: $577,000,000 Structure Flooding (100-yr Storm) Street Flooding (10-yr Storm) Estimated Construction Cost w/ Escalation (Cumulative) Stormwater Improvement Projects (Cumulative)Phase 5166.05 mi$0Current Conditions (No Improvements) 4705.02 mi$10.3 MLaskin Road Culverts and Tide Gates1A 4444.37 mi$93.7 MParks Ave Pump Station1B 4414.25 mi$229.3 M24thStreet Microtunneling2A 3723.89 mi$400.6 M24thStreet Pump Station2B 3263.21 mi$435.1 MArctic Avenue North3 2942.71 mi$474.7 MParks Avenue and Cypress Avenue4 2862.44 mi$506.6 M24thStreet and MOCA Channel5 2862.37 mi$537.8 MParks Avenue and Mediterranean Avenue6 Schedule 60 Q4 2029 Q4 2029 TBD TBD TBD TBD TBD TBD Q4 2027 Q4 2027 TBD TBD TBD TBD TBD TBD Q4 2026 Q4 2026 TBD TBD TBD TBD TBD TBD Q2 2026 Q2 2026 TBD TBD TBD TBD TBD TBD Pre-Final Pre-Final Pre-Final Pre-Final Pre-Final Pre-Final Pre-Final Pre-Final PH 1A – Laskin Rd Culverts and Tide Gates PH 1B – Parks Ave Pump Station PH 2A – 24 th St Microtunneling PH 2B – 24 th St Pump Station w/ Ocean Outfall PH 3 – Arctic Ave North Storm Imp PH 4 – Parks Ave and Cypress Ave Storm Imp PH 5 – 24 th Street and MOCA Channel PH 6 – Parks Ave and Med Ave Storm Imp Preliminary Engineering Construction Start RFQ / RFP Interviews Design Build Team Selected Construction Complete Summary With NO Infrastructure Improvements, modeling results: •6.05 miles of roadways flood during a 10-year design storm (3 inches or more over crown)* •516 structures flood during a 100-year design storm WITH Infrastructure Improvements, modeling results: •61% Decrease in Street Flooding (from 6.05 miles to 2.37 miles) •45% Decrease in Structure Flooding (from 516 to 286) Questions? Thank You.