Quick Verdict
Storm drain installation is the excavation and piping that collects surface water in catch basins and carries it away through underground pipe to an approved outlet. A catch basin is the grated box you see at low points in a lot or yard; it captures runoff and drops it into the storm system while trapping sediment and debris. On an Oregon site, this work keeps parking lots from ponding, protects foundations, and controls where all that winter rain ends up. The core of the job is trenching to grade, setting basins at the right elevation, laying pipe at a consistent fall, and tying into a legal discharge point.
What a Storm Drain System Includes
A working storm drain system is more than a pipe in the ground. It is a set of parts that have to be installed at the right elevations to move water by gravity.
- Catch basins: grated inlets set at low points that collect surface water and settle out sediment.
- Storm pipe: solid pipe, usually laid at a steady slope so water keeps moving without pooling.
- Cleanouts and junctions: access points where pipes meet or change direction, so the system can be cleared later.
- The outlet: where the water legally leaves, whether a public storm main, a detention pond, a drywell, or an approved discharge to daylight.
The whole thing lives or dies on elevation. If a catch basin sits too high, water never reaches it. If the pipe loses its fall, sediment settles and the line clogs. That is why storm drain work is careful excavation, not just digging a ditch.
The Installation Process
Installing storm drains follows a predictable sequence, and each step depends on the one before it.
- Locate and design. Confirm where water needs to go and where the legal outlet is, then set the grades. An 811 call-before-you-dig locate happens before any trenching.
- Trench to grade. Excavate the trench so the pipe can be laid at a steady slope, with bedding material under the pipe.
- Set the basins. Place catch basins at low points, at the correct rim and outlet elevations.
- Lay and connect pipe. Install pipe at consistent fall, connect to basins and the outlet, and check the line.
- Backfill and compact. Backfill in lifts and compact so the trench does not settle and crack the surface above.
On a paved site, this ties directly into parking lot sub-grade excavation, because the drainage has to be set before the base and asphalt go down. An Oregon excavation contractor guide approach sequences drainage first so you never have to cut open new pavement to fix it.
Cost of Storm Drain and Catch-Basin Work
Storm drain cost is driven by trench footage, depth, the number of basins, and how far the pipe has to run to a legal outlet.
| Work item | Industry baseline range |
|---|---|
| Trenching, per linear foot | $8 - $40+ per linear foot |
| Excavator + operator, hourly | $150 - $350+ per hour |
| Crushed gravel (bedding), delivered, per cu yd | $45 - $110+ per cu yd |
| Dump truck haul-off, per load (10-14 cu yd) | $250 - $750+ per load |
| Residential permit pull | $100 - $600+ (varies by jurisdiction) |
Permits, Discharge, and Erosion Control
You cannot legally send storm water just anywhere. In Oregon, larger sites and land-disturbing work can fall under DEQ stormwater rules and NPDES permitting, and most jurisdictions regulate where and how you discharge. Connecting to a public storm main usually needs a permit and an inspection. During construction, exposed soil has to be protected so sediment does not wash into the new system or off-site, which is where erosion control silt fence and blanket practices come in. Getting the outlet and the permits right up front avoids a stop-work order and a redo later.
Any project that disturbs one acre or more of ground has to carry a DEQ 1200-C construction stormwater permit, which requires an erosion and sediment control plan, weekly and rain-event inspections, and a designated person responsible for keeping the controls working. Smaller sites often trip a local erosion ordinance instead, so the threshold that matters is the one your city or county sets, not just the state acre. The other legal box to check is the outlet itself: many jurisdictions will not let you dump onto a neighbor's property or into a wetland or drainage ditch without approval, and a drywell or infiltration system has to be sized for the soil's real percolation rate. A licensed crew, verified through the Oregon Construction Contractors Board, sorts the permit path before the first bucket of dirt moves.
Common Cost Surprises on Storm Drain Jobs
Storm drain bids look simple until the trench opens up. The items that blow past the baseline are almost always underground and out of sight:
- Unmarked utilities. An 811 locate marks public lines, but private irrigation, old drain tile, and abandoned pipe are not on any map. Hitting them means hand-digging and delay.
- Rock or hardpan. Central Oregon basalt or a clay hardpan lens can force ripping or a hydraulic hammer, turning a one-day trench into three.
- High groundwater. On low Willamette Valley lots, water fills the trench faster than you can lay pipe, so a pump and gravel bedding get added mid-job.
- Deeper outlet than expected. If the legal tie-in point sits lower than planned, the whole line drops, the trench gets deeper, and shoring may be required past five feet.
Current Market Reality
Real storm drain costs often run 2 to 3 times the baseline once rock, dewatering, permits, or disposal of wet spoil enter the picture. A bid that looks cheap usually assumes clean, dry, shallow trenching -- which is not the norm on Oregon ground in a wet year.
Oregon Conditions That Affect the Job
- Willamette Valley clay drains slowly, so surface systems and detention matter more than infiltration.
- Central Oregon rock can force ripping or hammering in the trench, raising cost and slowing the dig.
- High groundwater on some low-lying sites means trenches fill with water and may need dewatering.
- The wet season is exactly when a bad drainage plan reveals itself, so the dry-season window, roughly May through October, is the time to install.
The Bottom Line
Storm drain and catch-basin installation is the difference between a site that sheds water and one that ponds, floods, and erodes every winter. The work rewards careful excavation: basins at the right elevation, pipe at a steady fall, a legal outlet, and clean backfill. If your lot, yard, or driveway holds water where it should not, get a licensed Oregon crew to design and dig it right the first time. See our excavation services and request a free estimate.