QUARTERLY STORMWATER UPDATEFLOOD CONTROL PROJECTS

TONI ALGER, P.E. – STORMWATER ENGINEERING CENTER ADMINISTRATORMARCH 27, 2018

Aragona Drainage Improvements

Ashville Park Drainage Improvements

Central Resort District Drainage Improvements

Chubb Lake/ Lake Bradford

Eastern Shore Drive Drainage

Sherwood Lakes Drainage Improvements

Stormwater Master Planning, Analysis and Inventory

Windsor Woods, Princess Anne Plaza, and The Lakes

DASHBOARD

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ARAGONA DRAINAGEIMPROVEMENTS, 7-400

Neighborhood developed in the mid 1950s

Storm drain improvements to address severe roadway flooding

Project limits include the area south of Haygood Road and west of Aragona Blvd.

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Estimated Total Project Cost: $3.76M

ARAGONA DRAINAGE IMPROVEMENTSFIRST QUARTER 2018 ACTIVITIES

▪ Design ongoing, approximately 50% complete

▪ Scheduled to advertise for construction in July 2018

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ASHVILLE PARK DRAINAGEIMPROVEMENTS, 7-047

Storm drain improvements to address severe roadway and property flooding

Stormwater Pump Station

Gated Control Structure at Existing Outfall (Flanagans Lane)

Additional Stormwater Ponds

Temporary pumping in advance of significant rainfall eventso Pump to elevation 1

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Phase I Estimated Project Cost: $11.2M - $13.5M

Estimated Total Project Cost: $35M; BTC: $26M

ASHVILLE PARK DRAINAGE IMPROVEMENTSFIRST QUARTER 2018 ACTIVITIES

▪ Ongoing – Maintain lakes at elevation 2.0▪ Dec 2017 – Phase I draft preliminary engineering report (PER)

submitted▪ Jan/Feb 2018 – Meetings with Developer, HOA, US Fish and Wildlife▪ February 27, 2018 – City Council Briefing▪ March 2, 2018 – Final PER completed▪ March 19, 2018 – Provided Developer draft term sheet & summary of

the cost participation▪ March 25, 2018 – Advertised Lake #14 Weir Gateo Complete construction October 2018

▪ March 30, 2018 – Draft 30% plans and term sheet

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CENTRAL RESORT DISTRICTDRAINAGE IMPROVEMENTS, 7-041

Multi-phase project to address severe roadway flooding

Improvements include storm drains, tide gate, pump station & ocean outfall

Interim Projects: o Replace existing 42” pipe

located under 24th Street with box culvert or bridge; estimated cost ~ $6M

o Redirect approx. 15 ac. from 21st St and Baltic Ave. to 16th St. Pump Station; estimated cost ~ $15M

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Estimated Total Project Cost: $113M; BTC $112.7M

CENTRAL RESORT DISTRICT DRAINAGE IMPROVEMENTSFIRST QUARTER 2018 ACTIVITIES

▪ No project activities at this time

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CHUBB LAKE/ BRADFORD LAKE , 7-053

Multi-phase project

Storm drain improvements to alleviate roadway flooding

Additional stormwater culverts under roadways

Tide control devices such as mechanized sluice gates

Stormwater management pond improvements

Channel and ditch clearing

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LAKECHUBB

BRADFORDLAKE

CHESAPEAKE BAY

Estimated Total Project Cost: $32M; BTC: $24.4M

CHUBB LAKE/ BRADFORD LAKEFIRST QUARTER 2018 ACTIVITIES

▪ Public Works continues coordinating with the Navy to open the weir gate when major rain events are forecasted

▪ March 27, 2018 – Public Works is meeting with JEB Little Creek staff to discuss cleaning ditch across Little Creek Base between Lake Bradford and Nider Boulevard

▪ Public Works/Operations waiting on permit to remove sediment from ditch between Nider Boulevard and Boone Clinic culvert

▪ Identified 2 Early Implementation Projectso 780 feet of ditch from the north side of Shore Drive north to Lake Bradford o 1,150 feet of ditch from Pleasure House Road (north of Shore Drive) west to

Lake Bradford

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EASTERN SHORE DRIVEDRAINAGE PHASE I,7-151 Multi-phase project

Flood control drainage improvements

Improvements include stormwater collection systems, tide gates & pump stations

Detailed Engineering Analyses to develop the specific program of flood control measures

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Estimated Total Project Cost: $83.2M; BTC $27.1M

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EASTERN SHORE DRIVE DRAINAGE PHASE IFIRST QUARTER 2018 ACTIVITIES

▪ Cape Henry Canal Drainage Improvements design underwayo Box culvert from Ebb Tide Road to West Great Neck Roado Side Street Outfall Improvements to Starfish Rd, Ebb Tide Road & Red Tide Rdo Begin construction – July 2018o Estimated Project Cost – $3Mo Provides an improved drainage outfall for the Shore Drive Corridor

Improvements – Phase III project (CIP 2-117)

▪ Parcel at Page Avenue for future pump station is being acquired as part of the Shore Drive Corridor Improvements – Phase III Roadway projecto Appraisals are underway

▪ March 15 & 26 2018 – Met with BAC and SDCC to give project briefing

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SHERWOOD LAKESDRAINAGE IMPROVEMENTS, 7-048

Project to address severe roadway and property flooding

Improvements include a pump station with a pipe connection between 2 lakes

Temporary Pumping in advance of rain event

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Estimated Total Project Cost: $3M

SHERWOOD LAKES DRAINAGE IMPROVEMENTSFIRST QUARTER 2018 ACTIVITIES

▪ Ongoing – Lakes pumped down to elevation 3.0 in advance of forecasted significant rainfall

▪ Design for the Permanent Pump Station including interconnect pipe is complete

▪ Design for pump station vault, lake intake pipe, and outfall pipe design is complete

▪ Plans for pump station, vault, lake intake pipe, and outfall pipe have been combined to be bid as one project

▪ Cost Participation Agreement and Construction Advertisement Pending

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WINDSOR WOODS, PRINCESSANNE PLAZA & THE LAKES, 7-028, 7-050, & 7-051

Detailed Engineering Analyses to develop the specific program of flood control measures

Projects combined for initial analysis

Analyses will Identifyo Needed Improvementso Cost of the Improvementso Implementation and

Phasing Plano Environmental Permitting

Required

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Estimated Total Project Cost: $129M; BTC: $73M

WINDSOR WOODS, PRINCESS ANNE PLAZA & THE LAKESFIRST QUARTER 2018 ACTIVITIES

▪ January 22, 2018 – Fact finding Charrette with Public Works Operations

▪ January 31, 2018 – Program Solutions Alternative Charrette

▪ January 31, 2018 – Completed initial stormwater models

▪ February 6, 2018 – Workshop to develop Princess Anne Plaza and The Lakes early implementation projects

▪ February 6, 2018 – Presentation to council on FEMA Flood Mitigation Grant projects

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WINDSOR WOODS, PRINCESS ANNE PLAZA & THE LAKESFIRST QUARTER 2018 ACTIVITIES

▪ February 19, 2018 – Follow-up of Program Solutions Charrette ▪ February 26, 2018 – London Bridge Creek Pump Station Location

Alternatives Draft Assessment Brief▪ March 7, 2018 – Public Utilities coordination for initial drainage

projects▪ Attended the following meetings:o January 9, 2018 – Princess Anne Plaza Civic League Project Updateo February 13, 2018 – Princess Anne Plaza Civic League Project Updateo March 13, 2018 – Princess Anne Plaza Civic League Project Update

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EARLY CONSTRUCTION PROJECTS –CLUBHOUSE ROAD DRAINAGE IMPROVEMENTS

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▪ Design in Progress▪ Survey and Geotech

work underway▪ Complete Design –

October 2018▪ Acquisition Complete –

September 2019▪ Construction Start –

January 2019

EARLY CONSTRUCTION PROJECTS – FEMA REIMBURSEMENT PROJECTS

▪ Project 1 – $4.2 Mo 2,608 lf of pipe improvementso South Plaza Trail from Rosemont Road to Presidential Boulevard to Windsor

Woods Canal

▪ Project 2 – $948 Ko 1,415 lf of pipe improvements o Old Forge Road to Red Lion Road to Windsor Woods Canal

▪ Project 3 – $201 Ko 445 lf of pipe improvementso Kings Point Court to Windsor Woods Canal

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EARLY CONSTRUCTION PROJECTS –FEMA REIMBURSEMENT PROJECTS

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▪ Engineering Design Initiated

DREDGING PROJECTS

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WINDSOR OAKS WEST I, CIP 7-415.039 Dredge 1,510-ft canal to restore

original drainage capacity 4,218 cubic yards of dredge

material removed Notice to Proceed –

June 2017 Construction Complete Total Project Cost – $700K

COMPLETED PROJECTS

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Avg. Pre-depth: 0.8’Avg. Post-depth: 4.05’

BeforeAfter

WINDSOR OAKS WEST II, CIP 7-415.039 Dredge 2,760-ft canal to restore

original drainage capacity 7,053 cubic yards of dredge

material removed Notice to Proceed –

July 2017 Construction Complete Total Project Cost – $675K

COMPLETED PROJECTS

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Avg. Pre-depth: 0.65’Avg. Post-depth: 4.55’

BeforeAfter

WINDSOR WOODS CANAL, CIP 7-028.002 Dredge 4,100-ft canal to restore

original drainage capacity Approximately 10,900 cubic

yards of dredge material Notice to Proceed –

June 2017 Construction Complete –

June 2018 Estimated Total Project Cost –

$2M

ACTIVE PROJECTS

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Avg. Pre-depth: 3.1’Avg. Post-depth: 5.2’

NORTHGATE DITCH, CIP 7-028.001 Dredge 6,000-ft canal to restore

original drainage capacity Approximately 3,000 cubic

yards of dredge material Notice to Proceed –

May 2017 Construction Complete –

May 2018 Estimated Total Project Cost –

$2M

ACTIVE PROJECTS

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Avg. Pre-depth: 1.5’Avg. Post-depth: 4.4’

WINDSOR OAKS WEST III, CIP 7-415.039 Dredge 2,150-ft canal to restore

original drainage capacity Approximately 5,000 cubic

yards of dredge material Begin Construction –

April 2018 Construction Complete –

January 2019 Estimated Total Project Cost –

$650K

ACTIVE PROJECTS

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Avg. Pre-depth: 1.8’Avg. Post-depth: 4.95’

SWM MASTER PLANNING, ANALYSIS, AND MODELING, 7-027

Updating the City’s 31 Stormwater Watershed Models

Includes Preliminary Drainage Analysis to identify future Capital Drainage Projects

Models will allow Stormwater Engineering Center to provide drainage design parameters such as downstream water surface levels to developers for projects

Models will be kept up to date and reside in the Stormwater Engineering Center

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Total Project Cost: $13.7M

SWM MASTER PLANNING, ANALYSIS, AND MODELINGUPDATE ON SCHEDULE

▪ Lynnhaven River Watershedo Watersheds 3, 5, & 8 are completeo Watersheds 4 & 7 completed January 2018o Watershed 6 & 30 to be complete by April 2018o Watershed 31 to be complete by October 2018o Watershed 1 to be complete by December 2018

▪ Atlantic Ocean Watershed o Watershed 29 to be complete by January 2019

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SWM MASTER PLANNING, ANALYSIS, AND MODELINGUPDATE ON SCHEDULE

▪ Elizabeth River Watershedso Watershed 2 to be complete by August 2018o Watersheds 17-22 to be complete by February 2019

▪ Southern Rivers Watershedo Watersheds 10 & 12 to be complete by April 2018o Watersheds 9 to be complete by August 2018o Watersheds 11, 16, 23-28 to be complete by November 2018o Watershed 13, 14 & 15 to be complete by January 2019

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DISCUSSION