Nine inches of rain a year sounds like a small number until you see what it does in one afternoon. Las Cruces averages 9.14 inches annually, and surrounding arroyos are described as dry streams that often carry water after heavy thunderstorms. A paved industrial yard turns that rain into runoff fast. Without a plan, it ends up in a dock door, a neighbor's field or a county road.
Stormwater detention and drainage is the system that catches, slows and releases water so that it leaves your site at a rate and in a place that is approved and survivable. It includes basins, inlets, pipes, swales, culverts, outfalls and the erosion control that protects them during construction. On an industrial site, it also includes the pavement grading that moves water away from buildings and docks.
We build these systems as part of the site, not after it. Drainage that is an afterthought is expensive to retrofit, and drainage that is designed with the building usually costs less, works better and gets approved faster.
Much of the county is flat or gently sloping, and flat ground does not forgive mistakes. Around Deming, minor flooding sometimes occurs over large areas of flat ground. In the Mesilla Valley, irrigation ditches that divert water from the Rio Grande cross farmland and sometimes run alongside industrial parcels. Farm irrigation around Hatch draws on ditches and surface water, and those structures may be in or near a site.
Industrial parcels near the border and the interstate often sit on plains where runoff runs in sheets. The question is not only how to handle the water that falls on your parcel, but how to pass or protect against water that arrives from upslope. We evaluate both during preconstruction and set the design to the worst credible storm, not the average year.
Local jurisdictions set drainage criteria for detention volume, release rate and outfall. The design must show pre- and post-development flows, basin sizing, pipe capacity and a safe path for overflow. Sites that disturb an acre or more also need coverage under a construction stormwater permit and a pollution prevention plan, with inspection records kept through construction.
Because the building itself is under the 2021 New Mexico Commercial Building Code, which adopts the 2021 International Building Code as amended, roof drainage and overflow provisions in that code also apply. We coordinate site and roof drainage so the two work as one system, and we confirm requirements in writing with the reviewing office before construction begins.
Our drainage scope includes detention and retention basins with outlet structures and spillways, storm drain pipe and inlets, culverts, concrete channels, swales and rundowns, headwalls, and rock or concrete energy dissipators at outfalls. We build the pavement grading that sends water to inlets and keeps ponding off docks and truck courts.
Construction detail matters. Basin slopes are compacted and stabilized, outlet structures are set to the elevations on the plans, and pipes are bedded, jointed and tested. Seeding or rock lining protects soil in basins. Because many yards are large, we also build trench drains and slot drains at dock aprons where water must be intercepted before it reaches a door. In a truck terminal or cross-dock, this work ties directly to dock aprons and loading zones.
We build detention and outfalls early, because they serve as sediment basins during construction. Perimeter controls go in before clearing. After mass grading, we install underground storm drains before utilities cross them, then set inlets and structures to final grade when paving is ready.
Before backfilling, we survey each pipe and structure so as-built information matches the design. After the first significant rain, we walk the site, look for ponding, scour and sediment, and repair what the storm shows. A drainage system shows its flaws only when water arrives, and we want to be there when it does.
Basin volume is the main driver, and it follows the amount of impervious area, so the size of the truck court and parking directly affects detention cost. Land used for basins cannot be built on, which is why some owners choose underground detention where land is expensive, at higher cost. Pipe length, depth, rock excavation and the distance to a legal outfall also matter.
We show alternatives with prices attached: a larger basin versus shallower basins, a conveyance swale versus a pipe, or a reduced paved area. The cheapest drainage system is often the one that was planned before the parking layout was fixed. The same logic applies to site clearing and mass grading, which sets the grades the system depends on.
Basins and storm drain trenches are deep, and rain can turn them dangerous. We use trench boxes or sloping, keep spoil piles back from edges, and monitor weather so workers are out of low areas when a storm approaches. In this region, storms can build quickly, and thunderstorms may bring flash flows through arroyos far from the rain itself.
We fence open basins, maintain access ramps and keep the public out. Confined-space entry for large culverts and structures is controlled by permit. For crews working in summer heat, we schedule deep excavation for the cooler hours and provide shade and water at the work face.
Send the survey or a pin on the map and we will tell you where we think water will come from and where it can go. For owners in agriculture and processing, our guide for food and beverage plants explains how drainage meets washdown requirements.
The size depends on the impervious area, the allowable release rate set by the jurisdiction, and the design storm. The civil engineer calculates it. We help early by testing layout options so the basin does not consume more land than necessary.
Only if the owner of that facility allows it and the design shows capacity. Irrigation ditches in the valley belong to districts, and their rules differ from city storm drains. We confirm the legal outfall before design is final.
Sites disturbing an acre or more generally do. It requires a written plan, controls such as silt fence and stabilized entrances, and regular inspections. We prepare the plan and keep the records.
Temporary basins and perimeter controls are installed first. We monitor forecasts, secure the site, and inspect after every significant rain. Damage to controls is repaired the same day.
Yes. Site drainage is reviewed with the building and site plan, and the permit may be held if the plan does not meet criteria. Our permitting and entitlements coordination work addresses this early.