QUARTERLY STORMWATER UPDATE FLOOD CONTROL PROJECTS TONI ALGER, P.E. STORMWATER ENGINEERING CENTER ADMINISTRATOR MARCH 27, 2018

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2 QUARTERLY STORMWATER UPDATE FLOOD CONTROL PROJECTS TONI ALGER, P.E. STORMWATER ENGINEERING CENTER ADMINISTRATOR MARCH 27, 2018

3 Aragona Drainage Improvements D A S H B O A R D 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 2

4 ARAGONA DRAINAGE IMPROVEMENTS, 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. Estimated Project Cost $3.76M 3

5 ARAGONA DRAINAGE IMPROVEMENTS FIRST QUARTER 2018 ACTIVITIES Design ongoing, approximately 50% complete Scheduled to advertise for construction in July

6 ASHVILLE PARK DRAINAGE IMPROVEMENTS, 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 events Phase I Estimated Project Cost $11.2M $13.5M

7 ASHVILLE PARK DRAINAGE IMPROVEMENTS FIRST QUARTER 2018 ACTIVITIES Ongoing Maintain the lakes at elevation 2.0, and pump down the lakes to elevation 1.0 in advance of significant rainfall forecast (3 inches in 24 hours) December 22, 2017 Phase I draft preliminary engineering report submitted January 8, 2018 Met with Developer to review Phase I draft preliminary engineering report February 7, 2018 Met with HOA February 13, 2018 Met with Fish and Wildlife 6

8 ASHVILLE PARK DRAINAGE IMPROVEMENTS FIRST QUARTER 2018 ACTIVITIES February 27, 2018 City Council Briefing March 2, 2018 Final preliminary engineering report completed March 25, 2018 Advertise weir and gated control structure o Complete construction October 2018 March 30, 2018 Draft 30% plans and term sheet 7

9 CENTRAL RESORT DISTRICT DRAINAGE IMPROVEMENTS, ATD: $300K, BTC: $112.7M 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 24 th 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

10 9 CENTRAL RESORT DISTRICT DRAINAGE IMPROVEMENTS FIRST QUARTER 2018 ACTIVITIES No project activities at this time

11 LAKE CHUBB CHESAPEAKE BAY CHUBB LAKE/ BRADFORD LAKE, BRADFORD LAKE 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 10

12 11 CHUBB LAKE/ BRADFORD LAKE FIRST 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 Projects o 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

13 I II EASTERN SHORE DRIVE DRAINAGE PHASE I, 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 12

14 13 EASTERN SHORE DRIVE DRAINAGE PHASE I FIRST QUARTER 2018 ACTIVITIES Cape Henry Canal Drainage Improvements design underway o Box culvert from Ebb Tide Road to West Great Neck Road o Side Street Outfall Improvements to Starfish Road, Ebb Tide Road & Red Tide Road o Begin construction in July 2018 o Estimated Project Cost $3M o 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 project o Appraisals are underway March 15, 2018 Met with BAC to give project briefing

15 SHERWOOD LAKES DRAINAGE IMPROVEMENTS, 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 Estimated Project Cost $3.0M 14

16 SHERWOOD LAKES DRAINAGE IMPROVEMENTS FIRST 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 Will advertise for construction in May

17 WINDSOR WOODS, PRINCESS ANNE PLAZA & THE LAKES, 7 028, 7 050, & Detailed Engineering Analyses to develop the specific program of flood control measures Projects combined for initial analysis Analyses will Identify o Needed Improvements o Cost of the Improvements o Implementation and Phasing Plan o Environmental Permitting Required

18 WINDSOR WOODS, PRINCESS ANNE PLAZA & THE LAKES FIRST 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 17

19 WINDSOR WOODS, PRINCESS ANNE PLAZA & THE LAKES FIRST 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 Update o February 13, 2018 Princess Anne Plaza Civic League Project Update o March 13, 2018 Princess Anne Plaza Civic League Project Update 18

20 EARLY CONSTRUCTION PROJECTS CLUBHOUSE ROAD DRAINAGE IMPROVEMENTS Design in Progress Survey and Geotech work underway Complete Design October 2018 Acquisition Complete September 2019 Construction Start January

21 EARLY CONSTRUCTION PROJECTS FEMA REIMBURSEMENT PROJECTS Project 1 $4.2 M o 2,608 lf of pipe improvements o South Plaza Trail from Rosemont Road to Presidential Boulevard to Windsor Woods Canal Project 2 $948 K o 1,415 lf of pipe improvements o Old Forge Road to Red Lion Road to Windsor Woods Canal Project 3 $201 K o 445 lf of pipe improvements o Kings Point Court to Windsor Woods Canal 20

22 EARLY CONSTRUCTION PROJECTS FEMA REIMBURSEMENT PROJECTS Engineering Design Initiated 21

23 22 DREDGING PROJECTS

24 COMPLETED PROJECTS Avg. Pre-depth: 0.8 Avg. Post-depth: 4.05 WINDSOR OAKS WEST I, CIP 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 23

25 COMPLETED PROJECTS Avg. Pre-depth: 0.65 Avg. Post-depth: 4.55 WINDSOR OAKS WEST II, CIP 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 24

26 ACTIVE PROJECTS Avg. Pre-depth: 3.1 Avg. Post-depth: 5.2 WINDSOR WOODS CANAL, CIP 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 Total Project Cost $2M 25

27 ACTIVE PROJECTS Avg. Pre-depth: 1.5 Avg. Post-depth: 4.4 NORTHGATE DITCH, CIP 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 Total Project Cost $2M 26

28 ACTIVE PROJECTS Avg. Pre-depth: 1.8 Avg. Post-depth: 4.95 WINDSOR OAKS WEST III, CIP 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 27

29 28 SWM MASTER PLANNING, ANALYSIS, AND MODELING, 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

30 SWM MASTER PLANNING, ANALYSIS, AND MODELING UPDATE ON SCHEDULE Lynnhaven River Watershed o Watersheds 3, 5, & 8 are complete o Watersheds 4 & 7 completed January 2018 o Watershed 6 & 30 to be complete by April 2018 o Watershed 31 to be complete by October 2018 o Watershed 1 to be complete by December 2018 Atlantic Ocean Watershed o Watershed 29 to be complete by January

31 SWM MASTER PLANNING, ANALYSIS, AND MODELING UPDATE ON SCHEDULE Elizabeth River Watersheds o Watershed 2 to be complete by August 2018 o Watersheds to be complete by February 2019 Southern Rivers Watershed o Watersheds 10 & 12 to be complete by April 2018 o Watersheds 9 to be complete by August 2018 o Watersheds 11, 16, to be complete by November 2018 o Watershed 13, 14 & 15 to be complete by January

32 DISCUSSION