Horizontal Drains in Colorado

Horizontal Drains in Colorado

Engineered horizontal drains across Colorado—I-70 Glenwood Canyon. Design/build solutions for CDOT corridors and critical infrastructure.

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Detail of horizontal drain pipe on slope

Horizontal Drains Across Colorado

Colorado's horizontal drain applications concentrate on Front Range and mountain corridor slopes where spring snowmelt drives seasonal pore pressure spikes, and CDOT's I-70 corridor sees drainage as an essential complement to the reinforcement work addressing the state's mountain slope instability.

GSI sees this alongside other Steep Slope Stability Issues work across the state's infrastructure network.

Geohazard Mitigation in Colorado

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How GSI Delivers Horizontal Drains in Colorado

Horizontal Drain Installation

Horizontal drains bored into Colorado's mountain slopes intercept spring snowmelt infiltration before it can pressurize failure surfaces along the I-70 corridor. GSI's horizontal drains experience informs this approach.

Pore Pressure Reduction

Reducing pore water pressure through horizontal drains raises the factor of safety on Colorado slopes ahead of the annual spring snowmelt pulse that triggers seasonal reactivation. This draws directly on GSI's soil nailing work.

Integration with Structural Reinforcement

GSI pairs horizontal drains with soil nailing on Colorado's steepest mountain slopes where snowmelt saturation exceeds what drainage alone can offset. GSI's landslide emergency response capability supports this step.

Where relevant, engineers is factored into the Colorado project plan from day one.

Colorado Horizontal Drains Process

GSI follows a systematic five-step process to deliver horizontal drains solutions in CDOT corridors and beyond.

Step 1

Site Assessment

GSI engineers evaluate conditions and severity at your Colorado site.

Step 2

Root Cause Investigation

In-house geologists investigate the specific conditions driving the issue, referencing Colorado's Rocky Mountain granite and Front Range expansive clay formations.

Step 3

Engineered Solution Design

Custom design matched to Colorado's site-specific geology, hydrology, and infrastructure loading.

Step 4

Design/Build Execution

One team executes the engineered solution under a single CDOT-ready contract.

Warranty

Design/build/warranty coverage on every horizontal drains solution installed in Colorado.

Warranty

Design/build/warranty coverage on every horizontal drains solution installed in Colorado.

Crew drilling horizontal drains for slope stabilization

Why Colorado Trusts GSI for Horizontal Drains

Engineered for Colorado's conditions. GSI positions horizontal drains ahead of Colorado's predictable annual spring snowmelt pulse — the specific seasonal trigger behind most mountain corridor slope reactivation. This is reinforced by GSI's work in general contractors and our case studies.

Design/build delivery. A single accountable team delivers design and build — eliminating the gaps that traditional design-bid-build creates.

CDOT specification compliance. Project records and construction methods conform to DOT requirements from the project's first submission.

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Client Reviews

Landslide Repair for Homeowner in Colorado

I would like this to be a letter of appreciation and gratitude on a job well done. Our house was first threatened by a landslide back in June, 2017 and it has been a journey that has been both stressful and scary. And yet, every cloud has a silver lining and in this case the support, encouragement and character of everyone we met from GSI has indeed been a gift throughout this journey.

GSI was recommended by Steve Pawlak and we met Nathan Thompson early on. Nathan is a person who inspires trust and our first impression was verified throughout the process that led to a retaining system that has saved our house. As with everyone, and I mean everyone we met, we felt we had a group of people who were on our side.

There were challenges that were overcome; the patience needed along with several visits to get the project underway, a renegotiated plan and bid when the insurance settlement squeezed the payment amount, and a time crunch that led to a change in plans where the panels were poured on the hillside, that allowed for the project to be started as quickly as possible.

The crew that showed up to do the work was respectful, always ready to explain what was happening and was also timely, hard working and ready to go the extra mile. A great group of people with positive attitudes who seemed to genuinely work well together.

Watching Spike work on that excavator was awe inspiring. One of my favorite moments was filming him on my phone to show my office secretaries at the Elementary School. I recorded a "holy shit" without knowing it when he pulled off an amazing stunt coming off a ledge and then being horrified when that came out while I was sharing the video at school. I was able to laugh later.

Thank you again and if I can ever serve as a reference, please let me know.

Erosion Control for Water Infrastructure in Minnesota

I am sending this to you from Duluth Minnesota where 4 of your employees just finished working on a wall they had put in for us previously. That was a few years ago after Duluth suffered a flood. We are on Lake Superior and St. Louis County wanted to help stop erosion. The guys worked during the rain and just kept on going, like little Energizer bunnies. Nice fellows, all of them!! They are certainly a credit to your company and I feel it is always good to give thanks to people for a job well done. Please let them know how much we appreciated their dedication to get the job done. We will always wish you and your team good days ahead!!

Positive Experience Working with Project Team

Justin, I wanted to reach out and let you know that is was a pleasure working with you all at the [….] Project. The guys on this job were very professional and never once wavered from the plans and specs. These guys did absolutely everything the right way and wanted to make sure that the customer was happy with the work. Again, I appreciate your guys’ hard work and professionalism and look forward to working with you again in the future.

Horizontal Drains in Colorado

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