# Hydro Excavation in Denver

Hydro excavation cuts soil with pressurized water and removes the slurry with an industrial vacuum. It exposes buried lines precisely without a blade or bucket, which is why it is the safe way to dig around live utilities.

- Non-destructive digging around live utilities.
- Precise potholing to confirm depth and location.
- Smaller, cleaner excavation footprint.
- Works in frozen and compacted Denver soils.

## What Hydro Excavation Is

A pressurized water wand breaks up soil while a vacuum boom simultaneously lifts the resulting slurry into a debris tank. Nothing rigid or sharp contacts the ground, so buried pipe, conduit, and cable are exposed rather than struck.

The typical use is potholing, sometimes called daylighting: opening a small precise hole to confirm exactly where a line is and how deep it sits before committing to a larger excavation or a bore path.

It also produces a cleaner site. Spoil goes into a tank instead of a pile on the lawn, and the hole is narrow and vertical rather than sloped and wide.

- Potholing to verify line depth and position.
- Exposing utilities before boring or trenching.
- Digging safely around gas, electric, and fiber.
- Slot trenching for narrow, precise runs.
- Excavating tightly around tree roots.
- Digging in frozen or heavily compacted ground.

## When Hydro Excavation Is the Right Method

Hydro excavation is the right method whenever an unknown or live utility sits inside the dig zone and striking it is unacceptable. It is the standard approach to verifying a locate before a machine goes in.

It is also right when the excavation needs to be small and precise, when working around tree roots you intend to preserve, and when ground conditions are frozen or compacted enough to make conventional digging slow and rough.

It is the wrong method as the primary technique on large volume excavation. Moving a lot of material by water and vacuum is slower and costs more per cubic yard than a machine, so it belongs where precision or safety is worth that premium.

- High volume digs where cost per yard governs.
- Large cobble or solid rock the water cannot cut.
- No practical way to stage the truck near the dig.
- No water supply or slurry disposal route available.
- Very deep excavation beyond effective boom reach.

## How a Hydro Excavation Runs

1. **Locate and Mark** Utility locates and electronic line locating define the target and everything nearby that must not be touched.
2. **Set Up and Cut** The truck is staged, surface is cut cleanly, and the water wand begins breaking soil at controlled pressure.
3. **Vacuum and Expose** Slurry is drawn into the debris tank as the hole advances, exposing the line without contacting it.
4. **Verify and Restore** Depth and position are documented for the next phase of work, then the hole is backfilled and the surface is patched.

## Disruption, Timeline, and Cost Drivers

Potholing is usually a same day task measured in hours. Site disruption is small: a truck, hoses, and a hole often no more than a foot or two across.

Cost drivers are the number of holes, depth, soil conditions, water supply and slurry disposal, how long the truck is on site, and access for staging the equipment near the work.

Compared per cubic yard, hydro excavation costs more than machine digging. Compared against striking a live gas or fiber line, it is inexpensive, which is the comparison that usually matters.

## Frequently asked questions

**When is hydro excavation the right method?**

When live or unverified utilities are inside the dig zone, when the excavation must be small and precise, or when tree roots and frozen ground make mechanical digging risky.

**What rules hydro excavation out?**

Large volume excavation where cost per yard governs, solid rock or heavy cobble, no truck access, or no way to supply water and dispose of slurry.

**Is hydro excavation safe around gas and fiber?**

It is the method specifically used for that situation, because water and vacuum expose a line without any rigid tool contacting it.

**What is potholing?**

A small precise hole opened to visually confirm the exact depth and position of a buried line before larger work begins.

**Does it work in Denver winters?**

Yes. Heated water cuts frozen ground that resists a bucket, which is one reason it stays useful year round here.

## Related Methods and Services

- [Open Cut Excavation](https://www.denversewerandwater.com/methods/open-cut-excavation) Traditional trenching when the line has to be exposed and physically replaced.
- [Directional Boring](https://www.denversewerandwater.com/methods/directional-boring) A steered bore that installs a new line on a new path under obstacles.
- [Line Locating and Marking](https://www.denversewerandwater.com/methods/line-locating-and-marking) Electronic locating that puts the line path and depth on the ground surface.
- [Method Comparison and Cost Guide](https://www.denversewerandwater.com/methods/sewer-repair-method-comparison) Side by side comparison of every method, what drives cost, and what rules each out.

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Source: https://www.denversewerandwater.com/methods/hydro-excavation