Efficient drainage is mandatory for all Houston parking lots, given the city’s tendency toward extreme weather events. Floods are common and can lead to catastrophic water damage if the pavement is not properly protected.
This guide to parking lot drainage solutions will cover drainage options and how they can make a difference for Houston property owners.
What are the Parking Lot Drainage Solutions that Houston Property Owners Should Consider?
An effective drainage system in Houston requires a multi-layered approach that involves surface and subsurface drainage structures. Property owners can benefit from any of the following solutions to protect their parking lots from flooding:
Curb and gutter systems and catch basins
Catch basins are subsurface drainage structures that serve as the primary collection point for runoff that is captured by storm drains, trench drains and other drainage structures. They consist of a grate or curb inlet, a concrete box (the basin) and an outlet pipe that feeds the runoff into a storm drain.
To maximize catch basin efficiency, they are installed at the bottom of a sloped surface and fitted with sediment traps. They offer high capacity for intense runoff flows and provide continuous drainage capabilities for Houston parking lots. They are excellent at managing debris and preventing it from entering storm sewers, and they can be tied directly into existing storm management infrastructure.
Detention ponds work by capturing large volumes of runoff temporarily, releasing it slowly after it is captured. They work by containing water that is routed to the pond, storing the excess volume and using a controlled outlet system to release that water slowly.
Detention ponds reduce peak discharge rates and minimize downstream flooding risk, and are therefore mandated for many development areas in Houston. These ponds protect infrastructure by reducing stress on storm sewers and are also endlessly scalable for commercial properties.
Retention ponds are similar to detention ponds, but instead of acting as a temporary containment structure, retention ponds provide long-term storage capacity. These ponds maintain a permanent pool of water that can store additional runoff during rainstorms. They release water through a controlled outlet and via evaporation, until water levels return to baseline.
Retention ponds provide superior water quality treatment, while reducing peak discharge rates like detention ponds. They are also an effective aesthetic feature and provide habitat for vegetation and some wildlife. Retention ponds are also highly scalable and can be fitted to any Houston property, no matter its size.
Why are Parking Lot Drainage Solutions Essential in Houston?
In Houston, there are several reasons why parking lot drainage solutions are critical for property owners. They include:
- Houston’s extreme weather events – Houston has always been known for its heavy rainfall, and in the last decade, several major flooding events have left many areas of the city underwater. According to the National Oceanic and Atmospheric Administration (NOAA), Houston averages four or five days of significant flooding every year. That means any commercial property must be ready for intense storms on an annual basis.
- Houston’s clay rich soils – Houston features large areas of clay-rich soils that cover large parts of the region. Clay-rich soils are a problem because they resist water infiltration. When high volumes of water flood clay soils, the water sits on the surface instead of soaking into the ground, meaning more water has to be captured and drained.
- Houston’s flat terrain – Houston sits on an extremely flat plain near sea level, with elevation changing about one foot for every mile of distance. The city sits on a flat table, so there is no natural grade to leverage for drainage reasons. That means property owners have to work harder to create a grade that promotes efficient drainage.
- Houston’s regulatory environment – With flooding a constant risk for the area, Houston has implemented several standards to improve drainage across the city. This includes detention capacity standards, standards regarding discharge rates and water quality standards that Houston property owners must observe.
Work with a Reputable Site Developer for the Best Parking Lot Drainage Solutions
Every Houston parking lot has one major enemy, and that is excessive rain runoff. If water is allowed to sit on the parking lot’s surface, it will find its way into weak spots and destabilize underlying soils. At that point, it is only a matter of time before base failures cause severe, irreversible damage to the parking lot itself.
The only way to avoid this is to install reliable, efficient drainage structures that provide flood protection for the parking lot. This includes catch basins, detention ponds and retention ponds. Each of these drainage projects requires precise grading and pavement work, so if you are developing a Houston property and parking lot, contact an experienced site development crew for a full inspection and drainage solution recommendation.
