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What a check dam does
A check dam is a small barrier installed across a concentrated flow path. Common settings include temporary construction swales, roadside ditches, drainage channels, and minor open channels. Water remains able to pass over, through, or around the controlled structure, but the barrier interrupts the uninterrupted downhill flow.
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It lowers velocity and erosive force
Fast, concentrated water has more ability to detach soil, scour a channel bottom, undercut banks, and enlarge a gully. A check dam causes water to back up for a short distance upstream. That flatter water surface and the roughness of the barrier dissipate energy, so the flow leaving the structure is less likely to erode the channel immediately below it when the installation is correctly designed.
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Sediment capture is a secondary effect
When water slows, some suspended soil particles can settle in the small pool behind the dam. USDA Agricultural Research Service observations also describe greater infiltration, higher soil moisture, and vegetation growth behind check dams in relatively small, not-too-steep channels. Those effects depend on soil, slope, storm intensity, drainage area, and maintenance; they are not a guaranteed sediment-removal rate for every site.
Iowa DOT rates sediment control as a low benefit and states that separate sediment-removal practices are still needed. Use inlet protection, sediment traps, settling basins, stabilized outlets, or other approved measures when the project’s objective is to remove sediment from stormwater rather than simply reduce channel velocity.
It does not eliminate runoff
A check dam changes how quickly water moves through a channel. It should not be described as a guaranteed reduction in total runoff volume. Iowa DOT’s benefit chart shows no rated runoff-reduction benefit for the practice. Some water may infiltrate behind a dam, but the amount varies with the soil and weather and cannot be assumed in a drainage calculation.
What field observations show
USDA ARS followed 37 check dams built in two small watersheds at the base of Arizona’s Santa Rita Mountains from 2008 through 2019. The agency reported sediment accumulation behind the structures, increased soil moisture and infiltration, and vegetation growth in the treated areas.
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In that project, some gullies in relatively small channels on slopes that were not too steep nearly disappeared as sediment accumulated behind a check dam in as few as three to four years. USDA research hydrologist David J. Nichols described the observation this way: “In relatively small channels that are not on too steep a slope, we saw gullies that had been getting worse every year almost completely disappear as sediment built up behind a check dam in as few as 3 to 4 years.”
The same report explains that slowing runoff can allow sediment to settle instead of being carried away. The Arizona observations are valuable field evidence, but they are not a controlled, universal prediction. A construction ditch in another climate, with a different soil, slope, drainage area, or storm pattern, can perform differently.
Can you put a check dam in a small stream?
“Small” describes size, not legal status or suitability. Several design manuals restrict check dams to swales, ditches, and small open channels and specifically exclude natural perennial or intermittent streams.
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- The Omaha Regional Stormwater Design Manual describes temporary aggregate check dams for small open channels draining 10 acres or less. It says the practice should not be used in a perennial or intermittent stream as the regulated waterbody.
- Georgia’s 2016 manual describes check dams for small open channels, says not to use the practice in a live stream, and gives a maximum dam height of 24 inches in the cited section.
Those are jurisdiction-specific standards, not universal dimensions or nationwide permission. Before placing any barrier in a natural channel, determine whether the watercourse is classified as live, perennial, intermittent, regulated, or otherwise protected in your jurisdiction. Obtain the required erosion-and-sediment-control approval and qualified design advice where local rules require it. Do not treat a retail erosion-control log or a construction detail intended for a ditch as suitable for a natural stream.
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Where check dams fit in a drainage plan
Use a check dam when concentrated flow is eroding a defined path and a temporary or locally approved barrier can safely reduce its velocity. It is most useful as one element of a treatment train rather than as a stand-alone answer.
Suitable applications
- Temporary construction swales before permanent vegetation or lining is established.
- Small roadside or site ditches carrying concentrated stormwater.
- Minor open channels where the drainage area, slope, and expected flows fit the applicable standard.
- Short reaches where reducing bed and bank scour is more urgent than removing large quantities of sediment.
Situations requiring another approach or specialist design
- Natural live, perennial, or intermittent streams unless the responsible authority expressly approves the work.
- Channels with high flows that could overtop, undermine, or bypass a small structure.
- Very steep grades where ordinary spacing and materials would not dissipate enough energy.
- Locations where backing water could flood a building, roadway, utility, neighboring property, or unstable bank.
- Projects whose main requirement is quantified runoff-volume reduction or high-efficiency sediment removal.
Design decisions that control performance
Confirm the drainage area and flow path
Map where water enters, concentrates, and leaves the channel. Check the contributing area, cross-section, bank condition, outlet, nearby structures, and the expected construction sequence. The Omaha example applies to small open channels draining 10 acres or less, but that threshold belongs to that manual and should not be transferred to another jurisdiction without checking its standard.
Account for slope and spacing
Steeper channels accelerate water more quickly and require closer dam spacing, according to Iowa DOT guidance. Spacing should be set so that the toe or crest of one structure works with the upstream water level created by the next structure, rather than leaving a long uninterrupted chute between them. Because spacing depends on grade, channel geometry, flow, and material, use the governing local standard or a qualified designer instead of a generic rule of thumb.
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Keep the center lower than the edges
The center of the barrier should be lower than its ends so overflow is directed through the intended section. If the edges are lower than the center, water can concentrate around a side, cut a bypass channel, and rapidly enlarge the failure. The Omaha manual specifically calls for maintaining a lower center and correcting edge erosion promptly.
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Choose a material for the intended service life
| Material category | Typical role in guidance | Important qualification |
|---|---|---|
| Erosion stone or aggregate | Can form a temporary or potentially permanent rock check dam where locally approved. | Requires stable edges, a sound foundation, and sizing appropriate to expected flow; “permanent” is a category in Iowa DOT guidance, not a guarantee at every site. |
| Fiber logs | Temporary control in swales, ditches, and similar channels. | Products differ in diameter, anchoring, density, and service life. A coir erosion-control log is one possible fiber-log type, but verify specifications and approval before purchase or installation. |
| Silt fence | Listed by Iowa DOT among materials used for check-dam applications. | It is not interchangeable with a rock structure; use only in the configuration and flow conditions allowed by the applicable detail. |
| Erosion-control blanket pillows | Temporary manufactured devices. | Useful life is finite and depends on the manual’s category and site exposure. |
| Sandbags | Temporary barrier material listed by Iowa DOT. | They can be displaced or degraded by flowing water and need inspection after storms. |
Material choice should follow the approved detail, not convenience. A product that works in a shallow construction swale may be unsuitable where flows are deeper, faster, or connected to a regulated stream.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to install a temporary check dam in a swale or ditch
The exact dimensions, anchoring, and spacing must come from the applicable local standard. The sequence below explains the work process without substituting for a site-specific design.
- Verify authorization and limits. Confirm that the channel is an eligible swale, ditch, or small open channel; identify drainage-area and height limits; and obtain permits or approvals before disturbing the channel.
- Survey the reach. Mark the channel centerline, banks, grade, inflow points, outlet, utilities, access route, and locations where ponded water could cause damage.
- Prepare stable contact surfaces. Remove loose debris and soft material only as allowed by the approved detail. Do not create a weak trench that will funnel water around the ends.
- Install the structure across the full flow width. Extend the ends into stable banks or otherwise anchor them as specified. The center must remain lower than the edges, and the crest should be even enough to avoid an unintended side jet.
- Provide the required downstream protection. Use the specified apron, lining, or outlet treatment so water leaving the dam does not scour the bed immediately below it.
- Install additional dams at the designed spacing. On steeper grades, use the closer spacing required by the governing standard rather than copying spacing from a flatter site.
- Stabilize disturbed soil. Seed, mulch, blanket, or otherwise protect exposed banks and access routes according to the project’s erosion-and-sediment-control plan.
- Inspect before the first forecast storm. Check that the center is lower than the ends, the material is tight, the banks are stable, and no bypass path has formed.
Inspection, maintenance, and failure response
Inspect after runoff-producing storms
The Omaha manual recommends inspecting check dams for sediment accumulation after storms that produce runoff. Look for a filled upstream pool, displaced stone or bags, damaged fiber material, water cutting around an edge, undercutting below the structure, and signs that the center is no longer the low point.
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Remove accumulated sediment when it reaches one-half of the measure’s original height, as specified by the Omaha manual. Dispose of or stabilize the material in an approved location; do not simply push it into the downstream channel.
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Repair bypasses immediately
Edge erosion is an early warning that water is avoiding the intended overflow path. Stop the bypass, restore stable contact at the bank, rebuild the center-low profile, and repair downstream scour before the next runoff event. If the channel has overtopped repeatedly, the structure may be undersized or improperly spaced and needs redesign rather than repeated patching.
Plan for finite service lives
Iowa DOT identifies rock check dams as potentially permanent while assigning shorter useful-life descriptions to temporary manufactured devices and erosion-control blanket pillows. These categories do not predict the life of every product. Replace temporary devices when they lose shape, anchoring, or permeability, and remove them when the temporary construction phase ends if the approved plan requires removal.
Check dams compared with other erosion controls
| Decision question | Check dam implication | What may also be needed |
|---|---|---|
| Is the problem fast concentrated flow? | Check dams directly target velocity and erosive energy in the channel. | Permanent vegetation, channel lining, grade control, or redesigned drainage for long-term stability. |
| Is the goal maximum sediment removal? | Sediment settling is a secondary, low-rated benefit. | Separate sediment-removal practices such as traps or basins. |
| Is the grade steep? | Closer spacing and more robust energy dissipation are required. | A qualified design using other grade-control or conveyance measures. |
| Is the channel a natural stream? | Do not assume eligibility; local rules may prohibit the practice. | Agency review and a stream-appropriate restoration or stabilization design. |
| Is the installation temporary? | Fiber logs, sandbags, silt fence, and other manufactured devices may fit approved temporary details. | Inspection, sediment removal, replacement, and final removal or conversion to permanent stabilization. |
Practical decision checklist
- Have you confirmed whether the channel is a ditch, swale, or regulated natural stream?
- What local manual governs the work, and does it specify a drainage-area or height limit?
- Is the primary objective velocity control, sediment removal, or runoff-volume management?
- Has a competent person checked grade, spacing, flow path, bank stability, and downstream scour risk?
- Are the material, anchoring, center-low profile, and outlet protection appropriate to the expected flow?
- Who will inspect after storms, remove sediment at the one-half-height trigger, and repair edge erosion?
- When will temporary devices be replaced or removed?
A properly placed check dam can buy time for vegetation or another channel lining to establish and can reduce gully growth in an appropriate small channel. Its success depends on local authorization, correct spacing and materials, stable edges, and continued maintenance—not simply on putting a barrier across moving water.
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