Phase 3 Drainage Project - Outfalls & Basin

City Council tasks the Planning Commission with developing a strategy to address drainage problems.
Completed: Aug 22, 2017
2017
Planning Commission begins discussing the issues and meeting with experts regarding next steps.
Completed: Sep 20, 2017
September 20, 2017
Planning Commission concludes that the next stormwater priority should be to improve the outfalls between 30th and 41st Avenues.
Completed: May 9, 2018
May 9, 2018
After interviewing several firms the Planning Commission recommends that City Council Enter into an agreement with Thomas and Hutton.
Completed: Oct 11, 2018
October 11, 2018
City Council approves award of a contract to Thomas & Hutton in the amount of $100,800 for surveying, needs assessment and conceptual design of Phase III Drainage Project.
Completed: Nov 27, 2018
November 27, 2018
City Council approves a proposal from Thomas & Hutton for small but high impact drainage projects in the basin along the Phase 3 Drainage project area.
Completed: Mar 26, 2019
March 26, 2019
City staff presents proposal to improve five (5) drainage deficient areas located on the basin between 30th and 41st Avenue.
Completed: Jul 23, 2019
July 23, 2019
City Council approves change order from Thomas & Hutton for small but high impact drainage projects in Phase 3 and issues approval of design, engineering, and permitting of Phase 3 Drainage Project.
Completed: Aug 27, 2019
August 27, 2019
City Council approves proposal in the amount of $18,900 for a conceptual assessment of the elevation of the Waterway Boulevard path to provide added protection from rising tidal waters.
Completed: Jun 23, 2020
June 23, 2020
City Council approves FY21 budget including funding for the small but high impact drainage projects and construction of the Phase 3 Drainage Project.
Completed: Jun 23, 2020
June 23, 2020
City Council approves a change order in the amount of $30,000 for Thomas & Hutton to conduct bidding and construction administration services for the small but high impact drainage projects.
Completed: Jul 28, 2020
July 28, 2020
The City submits a grant application to the Rural Infrastruction Authority for grant funds towards the construction of Phase 3 Drainage Project.
Completed: Sep 14, 2020
September 14, 2020
The City advertises RFB 2020-06 seeking bids for the construction of the small but high impact drainage projects.
Completed: Sep 27, 2020
September 27, 2020
City staff will hold a pre-bid meeting with interested bidders to provide an overview of the project and answer questions.
Completed: Oct 8, 2020
October 8 2020
Deadline for submission of proposals for the construction of the 5 small but high impact drainage projects.
Completed: Oct 29, 2020
October 29 2020
Utility relocations begin
Completed: Mar 1, 2021
March 1 2021
Drainage pipe installation - 41st Avenue
Completed: Mar 15, 2021
Mid March
Drainage pipe installation - Sparrow DriveDrive
Completed: Apr 1, 2021
Early April
Drainage pipe installation - Forest Trail
Completed: Apr 15, 2021
Mid April
Drainage pipe installation - Cross Lane
Completed: Apr 29, 2021
End of April
Council approves change order to Thomas & Hutton to include bidding and construction oversight of the 30th & 36th Ave Outfall Projects.
Completed: Jul 27, 2021
Jul 27 2021
Bid packet for construction of 30th & 36th Ave Outfall is released to prospective bidders.
Completed: Sep 14, 2021
Sep 14 2021
City holds pre-bid meeting with prospective bidders for the construction of 30th & 36th Ave Outfall Projects.
Completed: Sep 24, 2021
Set 24 2021
Deadline for bids for the construction of the 30th & 36th Avenue Outfall Project.
Completed: Oct 15, 2021
Oct 15 2021
City opened bids for the construction of the 30th and 36th Outfalls
Completed: Nov 10, 2021
Nov 10 2021
City Council approves a contract to Quality Enterprise in the amount of $2.27M
Completed: Nov 17, 2021
Nov 17 2021

The City has initiated the third phase of a project to improve storm water and tidal drainage across the island. This project is intended to make significant drainage improvements to the 30th, 36th and 41st Avenue outfalls which will improve conditions on the amount of standing water events experienced by residents and property owners.

The project began in 2017 when City Council tasked the Planning Commission with developing a strategy to address drainage problems. As part of the project, smaller but impactful drainage improvement projects along the basin will also be addressed. These are located at Sparrow Drive, Forest Trail, Cross Lane, 32nd Avenue and 41st Avenue.

The construction of the 30th and 36th Avenue outfalls began in early 2022 and expected completion in 2023. The construction of the drainage improvements to the 41st Avenue outfall is scheduled to begin in the fall/winter of 2023. 

Project Updates

Phase 3 Drainage Update - April 2023
Tuesday, April 11, 2023

30th Avenue

• Completed final cleanup and stabilization at 30th Avenue. Pavement markings complete.
• Dominion Energy set up new utility pole and Comcast relocating lines from temporary pole
• No work expected in the next 2 weeks: waiting on drainage inlet tops, fabrication of all metal
hardware and check valves for 30th Avenue

36th Avenue (Forest Trail)

• Junction box design still in process. Possible 6-week production timeline. City waiting on
confirmation from junction box manufacturer on production timeline to decide whether to carry
on project this summer or delay until end of beach season

41st Avenue


• OCRM issued critical area permit on 1/4/23.
• USACE issued permit on 4/5/2023.
• Construction start date still feasible for year end

Comprehensive Drainage Master Plan


• D&F making progress on preparation of capital improvement prioritization plan, maintenance &
development of recommendations.
• Scheduling presentation to Council at May 9, 2023 workshop

Phase 3 Drainage Update - March 2023
Tuesday, March 14, 2023

30th Avenue:

• All utility work complete
• Box culverts has been installed
• All inlets and small diameter pipe is installed
• Driveway pour is complete
• Concrete placed on homeowners' side of sidewalk (in place of
existing asphalt)
• Homeowner indicated they were happy with the work
• Paving completed 3/9. Road reopened Friday, 3/10
• All pumps are off and have been relocated to Forest Trail location


36th Avenue (Forest Trail):

• Junction box design still in process. Possible 6-week production
timeline


41st Avenue:

• OCRM issued critical area permit on 1/4/23. Waiting on USACE
permit

Phase 3 Drainage Update - January 2023
Tuesday, January 10, 2023

30th & 36th Avenue:

• Road work and detour at 30th Ave &
Waterway Blvd to begin week of January
16th and last approx. 8-10 weeks. When
complete, contractor will move to complete
road work at Forest Trail and Waterway Blvd


41st Avenue:

• OCRM issued critical area permit on 1/4/23.
Next step is for the USACE to issue final
federal permit
• Kick-off meeting with Thomas & Hutton and
the SC Office of Resilience scheduled for
week of January 9th

Phase 3 Drainage Update - November 2022
Tuesday, November 15, 2022

 30th & 36th Avenue:

• At 36th channel work adjacent to the golf
course is complete up to the cart bridge

• At 30th work completed up to a point near the
road where a pause is necessary to allow
coordination with Dominion Energy and the
construction of box culverts.

• Cart path behind 36th is prepped for paving


41st Avenue:

• Wetland permit (OCRM and USACE) still
pending. City has conditional approval from
OCRM. All other permits are contingent on the
wetland permit.

• City received $1.4M grant from the SC Office
of Resilience from CDBG-MIT funds for
construction.

• City received approval for additional $730,000
to pay for the extension of drainage pipes
along the edge of 41st Avenue into the marina
site.

Phase 3 Drainage Update - September 2022
Tuesday, September 13, 2022

30th & 36th Avenue:

  • Golf course portion of the work completed
  • Road work/closure at 30th Ave delayed due to box culvert approval process and 8–10-week manufacturing lead time
  • Work on 30th Ave restarted the week of September 12th and expected to take two weeks to complete pipes between homes and up to the road.
  • Contractor will then move to 36th Ave Outfall; once completed, will return to install junction box and box culvert at 30th Ave. (road closure work)

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • Project was put on public notice on April 14 until May 14.
  • City received $1.4M grant from the SC Office of Resilience from CDBG-MIT funds for construction. City received approval for additional $730,000 to pay for the extension of drainage pipes along the edge of 41st Avenue into the marina site.
Phase 3 Drainage Update - August 2022
Tuesday, August 23, 2022

30th & 36th Avenue:

  • Golf course portion of the work completed
  • Road work/closure at 30th Ave delayed due to box culvert approval process and 8–10-week manufacturing lead time
  • Work on 30th Ave expected in the next two weeks – contractor & engineer to install yard inlet to manage stormwater from yard of adjacent resident and complete installation of pipes between homes and up to the road.
  • Contractor will then move to 36th Ave Outfall; once completed, will return to install junction box and box culvert at 30th Ave. (road closure work)

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • Project was put on public notice on April 14 until May 14.
  • City received $1.4M grant from the SC Office of Resilience from CDBG-MIT funds for construction.
  • City held kick-off meeting with Office of Resilience staff and Thomas & Hutton to determine next steps to get the project ready to go to bid once permits are in hand.
  • Grant amendment request for the extension of pipe along 41st Avenue submitted.

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