Storm Sewer Installation for Multi-Family Developments

A phase-by-phase checklist for storm sewer installation on multi-family sites, covering design coordination, field installation, and testing, with a look at how it played out on The Hills of Minneola.

Multi-family sites concentrate a lot of impervious area — rooftops, drives, parking, and shared amenity space — into a footprint that has to drain to a single stormwater system without flooding a unit, a garage, or a neighboring parcel during the first hard Florida rain. That's what makes storm sewer installation on a multi-family project different from a single commercial pad: the pipe network, inlet spacing, and pond sizing all have to work together across dozens of lots or units, not just one building.

‍

Rather than tracking this as one line item, it helps to break storm sewer scope into three stages, each with its own checklist.

Design and Permitting Checklist

  • Confirm pipe sizing and inlet spacing match the approved drainage study, not just the architectural site plan.
  • Verify pond and outfall capacity against the full build-out, not just the first phase of units.
  • Check invert elevations against the rest of the utility plan so storm, sanitary, and water don't conflict underground.
  • Confirm permitting sign-off from the relevant water management district before trenching begins.

Field Installation Checklist

  • Verify trench conditions and bedding match spec before pipe goes in, especially in areas with variable soil.
  • Confirm structure and inlet locations against the plan before pouring, since a structure poured in the wrong spot is a costly fix later.
  • Sequence storm installation with the site's overall grading and utility schedule so trenches don't get re-opened after paving subgrade is set.
  • Keep erosion control active around open trenches and pond areas throughout construction, not just at the start of the job.

Testing and Closeout Checklist

  • Pressure or vacuum test structures and pipe joints per spec before backfill is finalized.
  • Inspect for standing water or drainage short-circuits after a rain event, before the punch list is finalized.
  • Confirm as-built elevations match design intent so the pond and outfall perform as modeled.
  • Walk the completed system with inspectors and confirm sign-off before the next phase of units is released.

How This Looked on The Hills of Minneola

The Hills of Minneola, a residential community wrapping up construction by year-end, is a useful example of why the checklist approach matters on a multi-family or multi-lot residential site. With storm sewer infrastructure serving multiple phases of home construction, the pipe network, inlets, and pond had to be sized and sequenced for the full community, not just the first section of lots — and closeout meant confirming the drainage system actually performed as designed once homes, drives, and lawns were in place, not just that pipe was in the ground.

Frequently Asked Questions

How is storm sewer sizing different on multi-family sites versus single-building commercial sites?

Multi-family storm systems typically serve a larger, more varied impervious footprint across multiple phases, so pipe sizing, inlet spacing, and pond capacity need to account for the full build-out, not just an initial phase.

What's the most common storm sewer mistake on phased residential sites?

Sizing the system for the first phase of lots and not confirming it still performs once later phases add more impervious area and flow into the same pond or outfall.

When should storm sewer testing happen relative to paving?

Before finished paving locks in the surface, ideally with a rain event or flood test to confirm the system drains as designed rather than relying on plan review alone.

Who signs off on a completed storm sewer system?

Typically the local jurisdiction and the relevant water management district, based on as-built elevations and a functioning inspection of pipe, structures, and pond capacity.

The Bottom Line

Storm sewer installation on a multi-family site succeeds or fails on coordination — between the drainage design and the field conditions, between phases of the community, and between the pipe network and the pond it feeds. A checklist that carries through design, installation, and testing catches the kind of drainage problems that otherwise show up as a flooded garage after the first real storm.

‍

Foshee Construction has installed drainage infrastructure across Central Florida since 1994. To talk through a storm sewer scope, start with the Foshee contact page.

Related Reading

‍

Latest Posts

How We Work Differently

Bid Smarter With the Right Tools

We build bids using HeavyBid and AGTEK because the details matter long before the job starts. When the numbers are accurate and the scope is clearly defined, it sets the tone for how the entire project runs. Estimating isn’t just a step in the process, it’s the foundation we build on.

Quality in the
Field

That same mindset carries into the field. Our crew is trained to work with purpose, follow the Civil Engineers’ Plan to the finest detail, and hold the line on quality. When expectations are clear from day one, there’s no need for shortcuts, and no confusion about how the work gets done.

Clear, Complete Bid Packages

Clients trust our bid packages because they’re complete and ready to use. Project managers know what we’re covering, what’s excluded, and how we plan to approach the job. That clarity removes friction and lets teams focus on execution instead of interpretation.

Proactive RFI Process

As part of our review process, we go into the plans before anything hits the site. We ask the questions early, resolve issues before they show up in the field, and keep RFIs moving. This approach prevents delays and protects the timeline.

Referred by the People Who Build

Over time, that consistency builds trust. Many of the people we work with today came through referrals from past projects – engineers, GCs, and superintendents who’ve seen how we operate and want the same experience again.

A New Chapter with Saga Infrastructure Solutions

In 2024, Foshee Construction was acquired by Saga Infrastructure Solutions, a national network of civil construction companies. Saga supports regional contractors by giving them access to better tools, long-term resources, and operational backing, without changing how they run day to day.
Foshee will continue to operate under its name, with the same team and field leadership in place.

“From the very time a project starts, we start that partnership. We try to catch as much as we can with the tools that we have. Not everybody is using the software platforms we are. That’s the differentiator: we’re not just bidding. We’re anticipating, problem-solving, and making sure the job runs right.”


‍— Don, CEO, Saga Infrastructure Solutions

Get in Touch

Foshee is now part of a broader regional strategy that includes Florida, the Piedmont Atlantic, Texas, Colorado, and the Arizona Sun Corridor. The name, crews, and standards remain. What’s improving is the support behind it.