Academy/Maintenance Fundamentals
Drainage
Where your property's water goes when it rains, and what happens when the plan fails.
Drainage is the system, grading, catch basins, ponds, and downspouts, that carries rainwater away from your buildings and pavement. When it fails, water does not disappear; it collects behind retaining walls, seeps into wall cavities, and pools where it was never designed to sit. Associations that own drainage structures have a real, documented maintenance duty.
What drainage actually covers
Drainage is not just the storm drain at the edge of the parking lot. It includes the site grading that carries water away from foundations, catch basins and storm drains, any detention or retention pond the association owns, and the downspouts and gutters (see gutters) that carry roof water to the ground. If your association owns a pond or detention basin, EPA's guidance expects a documented plan, not an as-needed response.
"Typical maintenance of catch basins includes trash removal if a screen or other device is used, and removal of sediment using a vactor truck."
Source: Stormwater Maintenance (NPDES), U.S. Environmental Protection Agency
EPA describes an operation and maintenance plan that names who is responsible, sets maintenance schedules, defines inspection requirements and their frequency, and identifies a funding source. That is a workable checklist for a board putting a drainage plan on paper for the first time.
Why poor drainage becomes a structural problem
Standing or misdirected water rarely stays cosmetic for long. Behind a retaining wall (see retaining walls), water that cannot drain builds up hydrostatic pressure, and bulging or bowing in the wall face signals that pressure is already at work. Differential settlement, where one section sinks more than its neighbors, is a serious risk indicator and a reason to call a structural or geotechnical engineer, not a landscaper.
"When they fail, from improper installation, inadequate flashing, or impact damage, water enters the wall cavity and causes extensive structural damage."
Source: Exterior Stucco & EIFS Stucco Wall System, InspectAPedia
Barrier-type EIFS, a synthetic stucco system, is the clearest example: it does not let water that gets in escape the way traditional stucco does, so a wall can look flawless from the ground while water is already rotting the framing behind it (see siding).
Whose job is it, and is your pond a dam?
A detention or retention pond the association owns is, in most cases, the association's maintenance responsibility, unless a specific agreement assigns it to a municipality. Some ponds and detention structures also meet a state's legal definition of a regulated dam, with its own inspection schedule set by hazard classification; whether yours qualifies depends on its height and storage volume under your state's rules. The only way to know is to call your state's dam safety office (see ponds). Do not assume a pond is just landscaping because the board has always treated it that way.
Check yourself
Answer before you read the explanation, recalling it is what makes it stick.
Your association owns a retention pond behind the clubhouse. Who is responsible for its ongoing maintenance and inspection?
A retaining wall in the common area has started to visibly bulge outward. What should the board do?
A resident says the EIFS-clad clubhouse wall looks fine, so no inspection is needed. Why is that assumption risky?
Sources
- Stormwater Maintenance (NPDES), U.S. Environmental Protection Agency
- A Retaining Wall Inspection Checklist for Your HOA, Criterium Engineers
- Exterior Stucco & EIFS Stucco Wall System, InspectAPedia
- Dams & Reservoirs, South Carolina Department of Environmental Services
Maintenance Fundamentals
Next, see how drainage failure shows up in the components most often blamed: retaining walls and siding.
Whether a pond or detention structure counts as a regulated dam, the exact operation and maintenance plan requirements for stormwater structures, and who is responsible for drainage components under your governing documents all vary by state and by your CC&Rs.