HOA & Property Management Drainage

A community is nine drainage sites sharing one budget line

Walk a subdivision, a townhome community or a managed apartment property with a drainage eye and the architecture disappears. What is left is a set of unrelated surfaces sharing a parcel: an entry drive that is also the fire lane, resident driveways and aprons, walks and courtyards, a pool deck, a mail kiosk, a dumpster pad, roof leaders discharging onto turf, and the low corner behind building four that has been wet since 2009.

Uniformity is a rule here, not a preference. Most governing documents say the community will look consistent, and drainage hardware is the most-walked-over piece of that consistency. A sand grate replaced with a black one because it was the only thing in stock on a Friday is an easily avoided violation letter, and one-at-a-time replacement is exactly how a community that started as all-Gray Spee-D grates becomes a patchwork of four finishes inside a decade.

The money arrives on a calendar. Little here is bought when it breaks; it is bought when the annual budget or the reserve study says so. That argues for one consolidated order per cycle, with a parts count a board can approve, rather than a trickle of petty-cash purchases nobody tracks.

Responsibility is split, and rarely the way people assume. On a typical plat the association owns the common-area system and the private storm lines, the unit owner may or may not own the apron drain, and the municipality owns the street inlet outside the gate. Your CC&Rs, plat and any recorded stormwater maintenance agreement decide that, not us. What we can do is make sure whoever is buying gets the right part, in the right finish, the first time — which is why property managers and HOA boards across the country order from us.

Every surface inside the gate — and who actually owns the fix

The entry drive, gate approach and spine road

The most visible drainage on the property and the most heavily loaded. An entry that ponds is the first thing a prospective buyer sees, and a gate approach that holds water will ice, sink and eventually crack. This is trench-drain territory: a run cut across the drive ahead of the gate, piped to a basin and out. Load class matters more here than anywhere else, because the entry is also the moving-truck route, the refuse route and usually the fire lane — Class C 250 at minimum, Class D 400 (a 400 kN test load) wherever a loaded trash truck turns.

Resident-facing surfaces: drives, decks, walks and lots

The complaint generators, and each has its own page rather than a paragraph here: driveway drainage for aprons and garage thresholds, patio and sidewalk drainage for walks, courtyards and the mail kiosk, pool deck drainage for the amenity deck, and parking lot drainage for guest bays and retail out-parcels. Read those for the design. Come back here for how to buy all of them at once.

Roof leaders, common turf and the low corners

Roof area is the largest single catchment on most communities and the one nobody counts. Leaders dumping at grade cut channels through mulch beds, undermine walks and drive water at foundations — see downspout drainage and yard and lawn drainage. The fix is almost always the same three parts: a catch basin at the low point, solid pipe on real fall, and a pop-up emitter or dry well at the discharge end.

Subsurface systems: genuinely part of this property, and not ours

Plenty of communities have real subsurface drainage, and pretending otherwise helps nobody. A french drain is perforated pipe bedded in washed stone and wrapped in filter fabric, trenched below grade to pull water out of saturated soil rather than off a surface. On a managed property they show up behind retaining walls, along building foundations, under soggy common turf and under amenity lawns and sports fields. They are installed by landscape and site contractors, and we do not sell perforated pipe, stone or fabric — that is contractor-installed territory. Nothing in our catalog is a french drain, and we will not describe it as one. What we do sell is the layer above: the surface collection points that intercept water before it reaches saturated soil, plus the basins, fittings and outlets that carry it away. Make that sequencing argument to a board — a subsurface system asked to soak up everything the roofs and pavement send it silts in years earlier than one handling only what the surface layer missed.

Downstream, by others

Detention and retention ponds, underground chambers, bioswales, water-quality units, oil/water separators and interceptors are civil and specialty scope — downstream, and by others. We supply the collection layer that feeds them. We also do not sell pumps, lift stations, septic, or treatment and recirculation equipment; a low point with no gravity outlet is a conversation with a civil engineer before it is one about parts. Roof drain bodies and interior leaders are plumbing scope: we pick the water up where the leader daylights, which is usually the exact spot the erosion complaint came from.

How water moves across a community, and how to tell the system has room

Before anyone picks a part number, get the volume roughly right. It is not hard arithmetic, and it settles most of the arguments that happen in a board meeting.

Start with what sheds. Roofs and pavement are effectively 100% impervious; turf absorbs until it doesn't, and saturated clay lawn in the third hour of a storm behaves like a parking lot. Every 1,000 sq ft of impervious surface produces about 623 gallons per inch of rain. Forty homes with 1,400 sq ft roofs is 56,000 sq ft — roughly 34,900 gallons in a 1 in. storm — before a single driveway, walk or clubhouse lot is counted. Two acres of pavement adds about 54,000 gallons per inch on top.

Then convert to rate, because channels and pipes are sized by rate: 1 inch per hour on one acre is roughly 1 cubic foot per second, about 449 gallons per minute. A three-acre community core under a 2 in./hr cell moves near 6 cfs, and it arrives inside twenty minutes rather than spread across the day.

Then follow it. Water sheets off roofs and pavement, concentrates where two slopes meet, runs the gutter line or swale, and pools at the lowest point it can reach. That low point is where a basin goes; the concentration line is where a channel goes. The most common design error we see on communities is a channel set partway down a slope, where water still has enough speed to skip the grate, instead of at the toe where it stops.

Then check the outlet, because the outlet is the bottleneck. The channel almost never limits the system; the pipe leaving it does. Solid drain pipe wants consistent fall — 1/8" to 1/4" per foot — and a 4" line carrying what a 6" line should is the real reason most "clogged" community drains back up. Before approving a run, put the numbers through our Runoff Calculator, read the method in Sizing for Storms: Estimating Runoff, and match load class to traffic with the Load Class Recommendation Guide.

Walk the property once with a tape measure and a phone

The most useful hour a manager can spend before ordering. Walk every zone and record four things per item: what it is, what size, what color, how many. Pull one grate of each type, photograph the underside where the part number is molded, and flag the cracked ones, the missing ones, the ones sitting proud where a mower catches them, and the basins that vanished under fifteen years of mulch. Send us that list and those photos; matching is the part we are good at.

Two things worth knowing before the board asks. Mini channel bodies, couplings and end caps come in Gray and Sand only, so a run needing new channel under a White grate is matched at the grate. And after twenty years of UV a new Gray grate reads a shade lighter for a season — if that matters at the entry monument or the pool gate, replace the whole run, not one section.

Where each product type earns its place on a community

Small channel — walks, courtyards, deck perimeters. Mini, Slim and Micro channel intercept a line of water across a pedestrian surface without cutting a 6" trench through a finished walk. On an accessible route the top matters more than the body: openings limited to 1/2" in the direction of travel, elongated slots perpendicular to the path. Read Understanding the ADA before standardizing a grate on a route residents cross with walkers and strollers.

Basins — low points, and the end of every channel run. Catch basins collect at a point and, just as importantly, give you a serviceable cleanout. Every channel run should terminate in one; a channel piped straight into a buried tee is a run nobody can maintain. Catch basin kits are the efficient buy when a property needs complete assemblies rather than loose parts — a 9" kit stands 10-1/8" tall, a 12" kit 12-15/16".

Grates — matched by finish, specified by load. Take the top from the grate catalog rather than an application page: channel grates by system, cast iron and ductile iron where vehicles or heavy mowers cross, galvanized steel in service areas, atrium grates in beds and turf where leaf litter blinds a flat grate, square and round grates on basins, decorative grates at an entry monument. And while the crew is out there, valve boxes and lids ride on the same order — matching lid color to the drainage hardware is a five-dollar decision that makes a property look maintained.

The community order, line by line

What we would put on an association's consolidated order, typed by the job each line does rather than by brand. Quantities come from the walk, load class from the traffic, channel width from the calculator.

Buying it as one order instead of nine work orders

Send a zone list, not a wish list. Entry drive, spine road, resident drives, walks and courtyards, pool deck, dumpster pad, turf low points. For each: what is there, the count, the finish, and the load class if vehicles cross. Photos of one grate per type beat any written description. We come back within one business day with part numbers, quantities and pricing, itemized by zone.

Ask for it split by zone. When the total lands above the reserve line, a zoned quote lets a board defer the guest-lot phase without anyone quietly substituting a cheaper grate at the pool gate — the substitution we see attempted most, and the one that generates the next complaint.

Know which lines ship and which get quoted. Stocked NDS, Stegmeier and Filcoten items ship as ordered; the ACO lines are quote-only and configured per project, so start those weeks ahead of an install window rather than the week of it.

Order the spares, and sort out receiving. A 10–15% overage on grates plus a couple of risers on the maintenance shelf turns a two-week work order into an afternoon, and protects the color match because the spares came off the same run. Confirm who is on site to take a pallet, and give us the maintenance yard address rather than a clubhouse locked at 3 p.m.