Our Commercial Drainage Assessment Process

Drainage Pro of CT assesses every commercial drainage problem before recommending a solution. We walk your site, identify the actual water source, design the right exterior system, and produce the installation and maintenance documentation your permits and SWPPPs require. This is how we approach every commercial drainage project on the Connecticut Shoreline — and it is why the systems we install work the first time.

The Assessment Is Not a Sales Visit. It Is the Work.

Most commercial drainage problems get sold before they get understood. A property manager calls about a flooded parking lot. A contractor walks the lot for ten minutes, quotes a catch basin, and submits a proposal the same afternoon. The basin gets installed. The lot still floods. A second contractor gets called. The problem persists because neither one identified where the water was actually coming from.

The failure pattern is consistent: someone recommends a solution before they understand the problem. The solution addresses a symptom. The symptom returns.

On Connecticut Shoreline commercial properties — where drainage conditions involve layered compliance obligations from Connecticut DEEP, local land use authorities, and in many cases the Industrial Stormwater General Permit — that failure pattern has real operational and financial consequences. A drainage system installed without a proper site assessment is not just ineffective. On a permitted site, it can be non-compliant.

Our assessment process exists to prevent both outcomes. We understand the site before we design anything. We design the right system before we install anything. We document the installation in a format that supports your permit compliance obligations from day one.

Property Managers, Facilities Directors, and IGP-Covered Industrial Facilities

Our commercial drainage assessment process is designed for the professionals responsible for the exterior condition and regulatory compliance of commercial properties on the Connecticut Shoreline: property managers overseeing multi-tenant commercial and retail buildings, facilities directors responsible for the operational and compliance condition of institutional and industrial sites, building owners managing commercial real estate investments where drainage affects both asset condition and permit standing, and the environmental consultants and licensed engineers who specify exterior drainage infrastructure as part of a stormwater management plan or SWPPP.

It is also specifically built for industrial facility operators covered under Connecticut DEEP's Industrial Stormwater General Permit.

How We Assess and Design Every Commercial Drainage Project

Every commercial drainage project we take on — regardless of site size, problem type, or service being installed — follows the same assessment process. This is what ensures the system we install is the right system for the specific conditions of your Connecticut Shoreline commercial property.

Step 1: Full Site Walk Before Any Recommendation

The assessment is a 60 to 90 minute on-site evaluation of your commercial property's exterior drainage conditions. We walk the full site, not just the problem zone. We evaluate the building perimeter at every elevation, the surface grade of every paved and unpaved area, the condition and position of existing drainage infrastructure, the relationship between your site and the properties and terrain around it, and the receiving system your site discharges to or is required to discharge to under applicable permit conditions.

We photograph every relevant condition. We note the position of existing catch basins, roof leaders, grade transitions, low points, wet zones, and areas of visible drainage failure. On sites with stormwater permit obligations or IGP coverage, we review the permit conditions and the applicable SWPPP requirements before the site walk so we know what compliance dimensions the assessment needs to address.

The site walk is a complete exterior evaluation, not a proposal conversation. We are there to understand the property before we recommend anything.

Step 2: Water Source Identification

After the site walk, we identify the actual source of the drainage problem. This is the step where most drainage contractors skip directly to a solution — and where most commercial drainage failures originate. The source of a commercial drainage problem is not always obvious from the problem zone itself.

A foundation perimeter saturation condition on a flat Route 1 commercial lot may be driven primarily by roof leader discharge rather than groundwater pressure. Correcting the leaders eliminates the source; installing exterior waterproofing without addressing them manages the symptom while the source continues. A parking lot that floods after heavy rain may be receiving offsite water from a higher-elevation neighboring property in addition to its own runoff. A catch basin that overflows at moderate events may be undersized for its actual drainage area, or receiving water from a contributing area not accounted for in the original design.

Water source identification requires tracing the complete movement pattern on the site — from where the water originates to where it accumulates — and understanding the relationship between surface drainage behavior, subsurface groundwater movement, roof drainage discharge, and, on Old Saybrook and coastal-adjacent sites, tidal water table behavior. The system we design is built around what the water source identification reveals, not around what the problem zone looks like from the parking lot.

Step 3: System Design to the Compliance Standard That Applies to Your Site

With the water source identified and site conditions documented, we design the exterior drainage system appropriate for your commercial property. The design accounts for the actual water volume the system needs to handle, the discharge constraints that apply to your site's location, the stormwater compliance requirements from Connecticut DEEP and local land use bodies, any SWPPP specifications that govern the infrastructure, and the practical access and installation conditions on your site.

We specify every component before we price anything: pipe diameter and material, drainage stone depth and type, catch basin size and position, outlet structure design, discharge routing, and the discharge termination point. On sites subject to a stormwater management plan or a SWPPP, we design the installed system to match the plan specifications and coordinate with your engineer on field interpretation of design details before installation begins.

The design is documented and shared with you before any work is scheduled. You know exactly what is going to be installed, where it is going, what it is designed to do, and what it costs before we start.

Step 4: Installation and SWPPP-Ready Documentation

Installation follows the designed system. We install to the specification from Step 3, with field adjustments coordinated with your engineer where permit conditions govern the installation details. Every component is installed to the performance standard required by both the design and the applicable compliance requirements for your site.

Documentation runs parallel to installation. Before work begins, we photograph the existing site conditions at every location where we will be working. During installation, we document each component as it is installed. After installation, we produce a written record of the work completed, the components installed, and the as-built conditions at the site. That documentation goes to you and is structured to provide directly to your engineer, your environmental consultant, or the relevant regulatory body without additional rework.

For IGP-covered industrial facilities, the documentation we produce at installation is the starting point for the ongoing maintenance record your SWPPP requires. It documents the baseline condition of every installed component so that subsequent inspection and maintenance visits have a clear reference point for each system element over time.

Ongoing Maintenance Documentation Structured for SWPPP Maintenance Logs

For industrial facilities operating under the Connecticut Industrial Stormwater General Permit, the maintenance records that support the SWPPP are a regulatory obligation. Catch basin cleaning records, outlet inspection logs, post-storm condition verification, and corrective action documentation all feed into the records your facility is required to maintain and produce during a DEEP inspection.

Drainage Pro of CT structures every commercial maintenance agreement to produce records that integrate directly into your SWPPP maintenance log. Every scheduled site visit generates a written inspection report with photographs of every component inspected or maintained. Every cleaning is documented with before and after images. Any condition that requires corrective action is flagged in writing with a recommended timeline so your facility manager or environmental consultant can act on it before it becomes a compliance issue.

We deliver maintenance documentation on the cadence your facility needs, in a format your environmental consultant or in-house compliance lead can integrate without rework. We do not write the SWPPP. We make sure the work it requires is being done, and we produce the records that prove it.

What We Do and What We Don't

Our commercial drainage assessment process produces exterior drainage installation and maintenance recommendations. It does not produce stormwater management plans, engineering certifications, SWPPP documents, or any deliverable that requires a Connecticut-licensed Professional Engineer or Certified Hazardous Materials Manager to produce or certify.

We are the exterior drainage contractor. We install and maintain the catch basins, French drains, underground pipe extensions, trench drains, retention and detention basins, grading corrections, and discharge management systems that your stormwater management plan, permit conditions, or SWPPP specifies. We maintain that infrastructure. We document the maintenance. We coordinate with your engineer and your environmental consultant on the installation details that their plans and certifications govern.

We do not replace the role of the licensed engineer or the environmental consultant. We execute the exterior infrastructure work their role generates. That scope discipline is what makes us a reliable partner for the environmental consultants and licensed engineers who specify exterior drainage infrastructure for commercial properties across the Connecticut Shoreline.

If your site already has a stormwater management plan, a SWPPP, or permit conditions that specify exterior drainage infrastructure, bring us in. We work from those documents and coordinate with your team. If your site does not yet have those documents and you are trying to understand what exterior drainage work is going to be required, our assessment gives you the site-specific drainage picture that the engineering process will need to work from.

What You Get From a Drainage Pro of CT Commercial Site Assessment

The assessment is free. It is also a specific, documented deliverable — not a walk around the parking lot followed by a verbal quote. Here is exactly what it includes and what you walk away with.

Commercial Drainage Services We Deliver Through This Process

Every commercial drainage service we provide starts with this assessment process. No guessing. No standard proposals applied to sites we have not walked. Just a designed exterior drainage system built for the specific conditions of your Connecticut Shoreline commercial property.

Foundation Drainage

Exterior foundation drainage systems for commercial buildings, including waterproofing membrane application, drainage board installation, and footing drain systems designed for the specific groundwater conditions at your commercial site.

Catch Basin Installation and Maintenance

Commercial catch basin system design, installation, and ongoing maintenance for parking lots, loading areas, access roads, and open site zones, with maintenance documentation structured for permit compliance and SWPPP maintenance log integration.

Retention and Detention Basins

Exterior retention and detention basin design and installation for commercial properties subject to Connecticut DEEP stormwater permit requirements or local land use stormwater conditions, sized and graded to the performance standards required by the applicable permit.

Stormwater Management

Complete exterior stormwater management system design and installation for commercial properties, including storm drain networks, basin systems, French drain infiltration systems, and surface grading, with documentation support for ongoing permit compliance and IGP obligations.

Parking Lot and Access Road Drainage

Parking lot catch basin networks, trench drain systems, and access road drainage infrastructure for commercial properties across the Connecticut Shoreline, sized and positioned through the same water source identification process applied to every project we take on.

Exterior French Drains

Commercial-scale exterior French drain systems for building perimeter drainage, site drainage, and stormwater infiltration, designed for the specific soil conditions and water table behavior of your Connecticut Shoreline commercial site location.

Downspout and Roof Leader Extensions

Underground commercial roof leader extension systems that route high-volume building roof water away from the foundation perimeter and off the site, designed for the roof area, leader count, and discharge constraints of your specific commercial building.

Grading and Swales

Commercial site grading corrections and swale construction designed to establish positive drainage direction and convey surface runoff toward controlled collection and discharge points, integrated with the complete stormwater management system rather than designed as standalone earthwork.

Loading Dock Drainage

Exterior loading dock trench drain systems and apron drainage infrastructure for commercial and industrial facilities, with discharge routing designed for the flat terrain conditions common to Connecticut Shoreline commercial sites and documentation standards that support IGP-covered industrial facility compliance.

Curtain Drains

Commercial curtain drain systems that intercept offsite water contribution before it reaches building perimeters, parking areas, or existing drainage infrastructure, positioned based on the water source identification performed during the site assessment.

Yard and Area Drains

Commercial area drain systems for landscaped entry zones, open lot areas, unpaved staging and storage areas, and building surround zones, connected to compliant discharge infrastructure appropriate for each site's location and applicable discharge requirements.

Commercial Drainage Assessment Serving the Connecticut Shoreline

Drainage Pro of CT provides commercial drainage assessments and exterior drainage installation for commercial and industrial properties across 13 towns on the Connecticut Shoreline. We are based in Clinton and serve commercial properties from East Haven and Branford in the west to East Lyme and Old Lyme in the east, and inland through Killingworth, North Branford, and Durham.

Schedule Your Commercial Drainage Assessment

If your Connecticut Shoreline commercial property has a drainage problem that has not been resolved, a stormwater permit obligation that needs exterior infrastructure to meet it, or an IGP-covered industrial facility with a SWPPP that specifies drainage installation or maintenance your current contractor is not delivering, schedule a commercial drainage assessment with Drainage Pro of CT. We will walk your site, identify the actual water source, and give you a clear and honest written plan with itemized pricing before any work begins. No pressure. No guessing. No proposals built on assumptions about a site we have not walked.