Paving
Industrial yard paving and drainage: loads, grades and repair scope
Match pavement to truck, forklift and trailer loads, then grade it to verified inlets and an approved outlet. Fix trapped water before resurfacing.
Direct answer
Industrial yard paving and drainage must work as one system: size the pavement for actual truck, forklift and concentrated stationary loads, support it on verified ground, and grade the surface to adequately sized drains and an approved outlet. Repair failed support and trapped water before overlaying. Separate traffic lanes, trailer landing areas and material storage zones because their loading, drainage and operating constraints differ.
On this page
What does industrial yard paving and drainage need to accomplish?What should you survey before pricing the work?Which truck, forklift and trailer loads control the section?Is asphalt or concrete better for an industrial yard?Why do yards rut, pump or hold water?What slope should an industrial yard have?How do you estimate runoff from a paved yard?Which drains belong at the surface and below the pavement?What permits and pollution controls affect the work?How do you estimate paving quantities without inventing a thickness?How can you pave a yard while trucks keep moving?What testing and handover records should you require?What belongs in the yard inspection checklist?How should an owner scope recurring yard maintenance?How do contractors find industrial yards that need a survey?Which standards and editions should the scope name?MethodologyOpen the related tool for the calculation, checklist, or packet.
FieldOS by AnvilfieldOffline-first FieldOS for job photos, proof packets, property memory, calculations, teams, billing, and owner-ready reports.Key takeaways
- Map wheel loads, trailer legs and turning movements before selecting pavement materials or thickness.
- Check inlet capture, pipe condition, downstream water levels and the overflow route before adding drains.
- Bid drainage repairs, pavement quantities, testing and operating-yard phasing as separate measurable items.
What does industrial yard paving and drainage need to accomplish?
Walk the yard along the route a loaded vehicle actually follows. The gate queue, scale approach, tight dock turn and parked trailer line can punish a pavement differently even when every area looks like the same blacktop. Draw these operating zones before discussing an overlay. Include the places where a breakdown would stop receiving, block emergency access or trap employees between moving equipment.
The pavement carries the load; the drainage system limits how long water sits on or within its support. A smooth surface over a saturated, unstable base is a short-lived improvement. Equally, a sound pavement can become unusable when a low inlet, blocked outlet or downstream surcharge sends water toward a dock. Ask the civil and geotechnical designers to resolve those interfaces together.
Set the deliverable in operating terms: which vehicles can use each zone, what happens during the selected design storm, where excess water goes, and what evidence releases the area to traffic. A paving quote that promises only a new surface leaves those decisions with the owner.
What should you survey before pricing the work?
Start with a measured base plan showing property limits, buildings, loading docks, gates, scales, stockpiles, utilities and known drainage easements. Locate inlets and outlets with identifiers that will stay on photographs, pipe inspection records and bid items. Ask the owner for drainage drawings, repair history, flooding photographs and restrictions on changing discharge points.
Survey pavement elevations, grade breaks, door thresholds, drain rims, accessible routes and pipe inverts on one documented vertical datum. Record inaccessible inverts as unknown. An inlet symbol without elevations cannot establish whether the proposed pavement drains, whether a pipe has fall, or whether raising the yard creates a threshold problem.
Visit during or soon after rain when practical and safe. Mark ponding boundaries and photograph the outlet at the same time. Record observation time, rainfall context, blocked grates and yard operations. A dry-weather photograph cannot establish drainage performance. Arrange cores, test pits and soil investigation where the load map and distress suggest a support problem, with utility clearance before intrusive work.
Which truck, forklift and trailer loads control the section?
Collect vehicle and equipment data from the operator, not just the maximum legal highway truck weight. Record loaded wheel or axle reactions, tire type, repetitions, standing duration and turning locations. A forklift's hard tires and a parked trailer's landing gear need different checks from a moving truck. Include proposed equipment purchases and changes in storage operations.
Anvilfield's contact-pressure calculation gives 125 psi for an 18,000 lb trailer-foot reaction on a fully contacting 12 by 12 inch plate: 18,000 / 144. Reducing contact to 6 by 12 inches doubles pressure to 250 psi. Have the designer evaluate the actual bearing condition, pavement capacity and load distribution.
| Operating zone | Load information to obtain | Design question |
|---|---|---|
| Through lanes | Axle loads, daily passes and design life | Can the pavement withstand repeated traffic on the measured support? |
| Dock turns and gate queues | Wheel paths, turning movements and standing time | How will the surface resist shear and slow loading? |
| Trailer parking | Landing-leg reactions, plate dimensions and placement | Are bearing and punching effects addressed? |
| Forklift and storage areas | Loaded wheel reactions, tire contact and rack or stack loads | Does the section suit concentrated loads and operating tolerances? |
ACI PRC-330.2-17, reapproved 2020, specifically addresses industrial trucks and disconnected trailer support checks. Obtain the project design rather than borrowing a parking-lot section.
Is asphalt or concrete better for an industrial yard?
Choose by zone. Asphalt may suit circulation areas where repair access and staged resurfacing matter. Concrete may suit trailer landing strips, dock approaches or other concentrated loading areas when designed for those loads. A mixed yard is often worth evaluating because one material need not carry every operating condition.
Compare complete assemblies: prepared subgrade, stabilization where required, base, pavement, joints, drainage structures and construction access. Concrete strength alone does not specify slab thickness or joint load transfer. An asphalt mix name alone does not specify the structural section. Ask each bidder to price the same approved design and reopening conditions.
Check transitions closely. A concrete landing strip can interrupt an existing drainage path, and an asphalt overlay beside it can create a trough. The grading plan must show the finished relationship between materials, inlet frames and dock elevations.
| Option | Where to evaluate it | Detail that must be resolved |
|---|---|---|
| Asphalt section | Truck circulation and repairable phased areas | Structural thickness, mix suitability, compaction and resistance to slow turning loads |
| Concrete section | Landing gear, dock aprons and concentrated load zones | Support, slab design, joints, load transfer and strength required for opening |
| Mixed pavement | Yards with distinct circulation and stationary load zones | Transition grades, joint details, drainage continuity and future repair boundaries |
These are screening choices for a project designer, not standard thickness recommendations.
Why do yards rut, pump or hold water?
Measure the failure before selecting the treatment. Wheel-path depressions may involve the asphalt, the supporting layers or both. Settlement around a utility trench points to a different investigation from surface shoving at a tight turn. Record distress dimensions, loading history and the relationship to buried work and drainage structures.
Water and fines emerging under wheel loads warrant investigation of the support and drainage. Correlate cores and test pits with wet areas rather than sampling only convenient dry locations. FHWA's Geotechnical Aspects of Pavements manual explains construction verification for unbound layers and the need to keep drainage materials functional during construction.
Distinguish a local surface depression from system backup. If the grate is clear but water rises from the structure during rain, investigate the downstream system and receiving water. If ponding stays away from a functioning inlet, survey the intervening grades. Cleaning, local regrading, pipe repair and full-depth reconstruction solve different problems.
ASTM D6433-24 can organize a pavement condition index, or PCI, survey for roads and parking lots. Its published scope says PCI does not measure structural capacity. Use condition ratings to prioritize investigation, with the industrial load map alongside them.
What slope should an industrial yard have?
Specify positive drainage with surveyed finished elevations and construction tolerances. There is no single slope in this guide that makes every industrial yard acceptable. The workable geometry depends on surface texture, flow length, equipment stability, dock approach limits, accessible routes and available outlet elevation. Have the designer resolve those limits before choosing the overlay thickness.
Anvilfield's grading calculation gives 1.00 foot of fall across an 80 foot run at 1.25 percent. A low pavement elevation of 100.80 feet therefore places the high point at 101.80 feet on the same datum. The designer must coordinate those finished elevations with the actual drain and adjacent work.
With 0.40 foot of available fall across the same 80 feet, the average slope is 0.5 percent. Compare that constraint with dock thresholds, gate clearances and adjacent pavement. Resolve the drainage path or reconstructed grades before an overlay consumes the remaining fall.
Keep accessible routes distinct from truck-area grading criteria. Under the ADA Standards, section 403.3 limits walking-surface running slope to 1:20 and cross slope to 1:48 where that provision applies. Check applicable ramp, landing and parking provisions separately. Verify finished work locally, since an acceptable average slope can conceal a low spot.
How do you estimate runoff from a paved yard?
Delineate each contributing drainage area, including roofs or neighboring land that actually reaches the yard. FHWA HEC-22, fourth edition (2024), describes the Rational Method for small drainage areas and the importance of rainfall intensity and time of concentration. The permitting authority's accepted method and rainfall criteria control the project calculation.
Anvilfield's peak-flow calculation gives 6.3 cubic feet per second for a 2.0 acre paved catchment, a runoff coefficient of 0.90 and rainfall intensity of 3.5 inches per hour. The customary rounded US expression is Q = C x i x A. Select project rainfall intensity for the required storm and a duration equal to the catchment's time of concentration.
Anvilfield's event-volume calculation gives 7,260 cubic feet of rainfall from one inch over 2 acres: 87,120 x (1 / 12). Applying a 0.90 event runoff fraction produces 6,534 cubic feet, or 242 cubic yards. Detention design also needs the runoff hydrograph, outlet control and downstream conditions.
Check inlet capture and bypass, pipe hydraulics, downstream water levels and a safe overflow route. A peak-flow estimate alone cannot size detention, prove grate capture or select a pipe diameter.
Which drains belong at the surface and below the pavement?
Surface inlets and trench drains intercept runoff. Underdrains collect water within or below the pavement support where the design provides a drainage path. Do not substitute one for the other. A perforated pipe cannot correct a surface grade that sends water into a building, and a larger grate cannot drain a saturated base with no connection to it.
Use point inlets where the grading can direct water to them without unacceptable depressions. Evaluate trench drains across a threshold or traffic path when linear interception fits the layout. Account for approach flow, debris, inlet bypass and maintenance access. A long channel still needs adequate outlets and a downstream system that can receive the flow.
Specify the full drain assembly for the actual wheel loads: grate, frame, channel, anchorage, concrete support and adjacent pavement. ULMA's Civil F range lists D400, E600 and F900 options for heavy applications. Those product classifications do not establish that any selected assembly suits a particular forklift, nor should they be treated as direct equivalents of US highway load designations.
For underdrains, document pipe elevations, filter compatibility, backfill, cleanouts and the outlet. FHWA's construction guidance emphasizes protecting drainage aggregate from contamination and maintaining working outlets. Before burial, photograph the system against station references and verify that the intended discharge path is available.
What permits and pollution controls affect the work?
Identify the industrial stormwater permit, receiving system, discharge authorization and stormwater pollution prevention plan, or SWPPP, before changing drainage. Map fueling, maintenance, outdoor storage and wash areas separately from cleaner runoff. Have the responsible permit specialist determine how their drainage should be handled. A new inlet does not authorize a new discharge.
As checked on November 5, 2026, EPA reports that its 2021 Multi-Sector General Permit expired February 28, 2026 and continues administratively for facilities or operators covered before expiration. Do not describe a proposed replacement as an effective permit, or treat that continuation as coverage for a new operator. Most projects need the responsible state's permit determination rather than a federal permit label copied into the bid.
Construction disturbance needs a separate coverage review. EPA's modified 2022 Construction General Permit addresses disturbance of one or more acres, including smaller sites within a qualifying common plan, subject to eligibility and discharge conditions. Its stated expiration is February 16, 2027. Confirm state and local requirements, exemptions and project coverage before mobilization.
Carry inlet protection, sediment handling, dewatering, concrete washout and spill response as defined work. Keep washwater and spills out of storm drains. Specify who maintains temporary controls while the yard remains active and who updates the final drainage map and SWPPP.
How do you estimate paving quantities without inventing a thickness?
Anvilfield's pavement takeoff gives 870 short tons of compacted asphalt and 1,620 short tons of compacted aggregate base for a 36,000 sq ft work zone with a 4 inch asphalt layer and an 8 inch base. Obtain the project pavement design before using layer depths for procurement.
The ordering allowances bring asphalt to 896.1 short tons and base to 1,701 short tons. Keep compacted quantities, procurement allowances and truck-delivered volume separate in the estimate.
| Item | Anvilfield takeoff calculation | Quantity |
|---|---|---|
| Compacted asphalt | 36,000 x (4 / 12) x 145 / 2,000 | 870 short tons |
| Asphalt order allowance | 870 x 1.03; 3 percent allowance | 896.1 short tons |
| Compacted aggregate base | 36,000 x (8 / 12) x 135 / 2,000 | 1,620 short tons |
| Base order allowance | 1,620 x 1.05; 5 percent allowance | 1,701 short tons |
Use approved material densities and the supplier or project ordering basis for procurement. Price removals, unsuitable soil, stabilization, drains, testing and phasing separately.
How can you pave a yard while trucks keep moving?
Build the sequence around the owner's actual receiving schedule. Identify the minimum usable gate width, turning area, dock access and emergency route for each phase. A temporary lane must carry the vehicles assigned to it; calling it temporary does not make weak ground adequate. Coordinate physical separation, spotters and reversing restrictions with the site's traffic-control arrangements.
Provide temporary drainage for every stage. Milling can remove the fall that currently reaches a drain. An open excavation can become the yard's low point. A temporary ramp can dam sheet flow. Show where water goes overnight and during a shutdown, with responsibility for maintaining controls and inspecting the work after rain.
Set hold points before excavation, before covering drains, before paving and before reopening. For concrete, require the project's specified evidence of opening strength. For asphalt, use the specified compaction, temperature and opening requirements. Neither material gets a universal reopening time from this guide.
Put lost production, extra mobilizations, temporary surfacing and weekend work in the estimate where they can be reviewed. Ask the owner to approve the phase drawings and access limits before the crew and material deliveries are committed.
What testing and handover records should you require?
Require the geotechnical acceptance basis to identify the test method, reference density, moisture limits, lift requirements and frequency for each material. A note saying 95 percent compaction is incomplete without its reference method and project criteria. Record test locations against the yard plan, along with failed results, corrective work and retests.
For pavement, preserve approved mixtures, delivery tickets, placement locations, thickness records and the specified acceptance tests. Concrete records should include the joint layout, curing and opening-strength evidence. Asphalt records should connect density and thickness results to the relevant placement area. Resolve rejected work before it disappears beneath the next layer.
Survey final grades and drain elevations; inspect and document pipe condition as specified. A controlled water test can reveal local flow direction and low spots but cannot demonstrate design-storm capacity. Compare the finished geometry with the approved hydraulic design, and investigate discrepancies rather than accepting a dry photograph.
Hand over an indexed drainage plan, outlet locations, inspection access, maintenance instructions and warranties. List every unresolved item with its operating restriction, responsible party and completion date. Record the authorized traffic release by zone so an unfinished landing strip is not mistaken for an available parking area.
What belongs in the yard inspection checklist?
Use this checklist for the scope walk and repeat the relevant items before accepting the work. Attach measurements and dated photographs to the same zone identifiers. Checking a box records a completed review; it does not replace an engineering acceptance decision.
Want this checklist to run itself on every job — with photo proof and a signed record crews can hand the customer? That's FieldOS.
How should an owner scope recurring yard maintenance?
Buy an inspection and response program tied to the yard map. Define which surfaces and structures are included, who moves parked trailers, who removes collected material, and what access is available during operating hours. Specify reporting time and the route for urgent defects rather than relying on a general promise to keep the yard maintained.
Separate routine tasks from investigation and capital work. Sweeping, grate clearing, sump cleaning and documented crack repairs can have measurable quantities. Repeated settlement, pumping, unknown pipe condition and flooding need defined investigation allowances and review. Replacing the same patch repeatedly should trigger a cause review with photographs and repair history.
Set inspection frequency from the applicable permit, manufacturer instructions and site risk. Add owner-defined checks after relevant storms or changes in equipment, storage and traffic. Compare observations from the same locations over time, including ponding depth, drain blockage and repair boundaries. This gives the facility manager evidence for the next budget instead of a collection of unrelated service tickets.
How do contractors find industrial yards that need a survey?
Define a service territory by the kind of yard your crew can investigate and repair: distribution trailer storage, manufacturing circulation, equipment rental or material handling. Screen visible yard area and access against mobilization cost, then qualify site operations and the person responsible for pavement spending. A property list establishes places to investigate; it does not establish defects or a request for bids.
For a custom industrial yard survey territory, PorchRocket's Asset Search returns the owner of record for each visible site it finds. Use that starting record to confirm the operating tenant, maintenance responsibility and access for a measured site walk.
Offer a defined first deliverable: load-zone map, visible condition record, drainage unknowns and investigation scope. Keep aerial observations separate from measured grades, buried pipe condition and pavement capacity. Those distinctions help an estimator quote the next investigation without implying that an overhead view has diagnosed the yard.
Which standards and editions should the scope name?
The reference basis checked November 5, 2026 includes FHWA HEC-22, fourth edition (2024), for drainage methods; ACI PRC-330.2-17, reapproved 2020, for industrial concrete site paving; and ASTM D6433-24 for visual pavement condition surveys. FHWA's Geotechnical Aspects of Pavements is a 2006 reference manual, not a newly issued construction code. State the contract's actual design and acceptance specifications alongside these references.
Check the adopted site-development, stormwater, accessibility and utility requirements with the responsible authorities. Manufacturer drain classifications and installation details are product-specific submittals. The public ACI abstract and ASTM scope verify document identity and subject; detailed design or acceptance requires the complete referenced document and the project requirements.
For associated lighting, gates or powered drainage equipment, this guide's electrical coordination basis is NFPA 70. Use the edition effective for the site's permit, including local amendments; this guide references NEC 2023 and NEC 2026. Minnesota, for example, applies the 2026 NEC to electrical permits filed on or after August 17, 2026. Record which edition governs the actual site before relocating equipment or altering cover over existing electrical installations.
Methodology
Anvilfield research uses FHWA HEC-22 for drainage methods, ACI's industrial-paving scope, ASTM's PCI limitations, EPA permit records and the cited accessibility provisions. The project authority establishes storm criteria, discharge permissions and pavement acceptance.
The grading case uses an 80 foot run, 1.25% slope and 100.80 foot low elevation; the constrained case has 0.40 foot available fall. Peak flow uses the rounded US Rational Method with C = 0.90, i = 3.5 inches/hour and A = 2 acres. Event volume separately uses one inch of rain over 87,120 sq ft and a 0.90 runoff fraction. The contact-pressure model divides an 18,000 lb reaction by 144 or 72 sq in of contact.
The takeoff model uses 36,000 sq ft, 4 inches of asphalt at 145 lb/cu ft, 8 inches of base at 135 lb/cu ft and 2,000 lb per short ton. Ordering adds 3% asphalt and 5% base. The model inputs describe the calculation case; project design, approved material data and hydraulic routing establish construction quantities and requirements.
FAQ
How thick should asphalt be in an industrial yard?
Use a project pavement design based on wheel and axle loads, repetitions, support conditions, materials and drainage. Truck circulation and trailer landing areas need separate load checks. The takeoff case uses a 4 inch asphalt layer; the project design establishes the actual section.
Can you overlay a yard that ponds after rain?
Only after resolving why it ponds and confirming the proposed finished grades. An overlay can worsen threshold clearances or trap water behind raised pavement. Survey the low points, inspect the receiving system and determine whether support repairs or drainage reconstruction are required first.
Is a trench drain better than a catch basin?
It depends on the grading and interception problem. A trench drain collects along a line; a catch basin receives flow directed to a point. Both require adequate capture, load-rated assemblies, maintenance access and a functioning downstream outlet. Compare the complete drainage layouts.
Will an underdrain stop surface flooding?
An underdrain addresses water within the pavement support when designed with suitable filters and an outlet. It does not replace surface grading and runoff collection. Investigate surface flooding and saturated support separately, then coordinate the repairs.
Does every industrial yard need a stormwater permit?
Do not decide from the word industrial alone. Have the permitting authority or responsible specialist determine applicability, industrial activity, exposure, discharge conditions and coverage. Construction disturbance and the operating facility may need separate permit reviews. Confirm the current state or federal permit before changing drainage.
Does a high PCI prove the yard can carry a loaded forklift?
No. ASTM D6433-24 describes a visual condition survey and expressly distinguishes PCI from structural capacity. Obtain the forklift's loaded wheel reactions and contact information, then have the pavement section and support evaluated for that equipment.
How soon can trucks return after paving?
Use the project-specific release criteria. Concrete needs the required opening-strength evidence; asphalt needs the specified placement, compaction and opening conditions. Include drain surrounds and transitions in the release review, and document which traffic is authorized in each completed zone.
What should a contractor quote before a full reconstruction design exists?
Quote a bounded investigation: survey limits, pavement cores, soil investigation, drainage inspection, load collection and reporting. Identify access arrangements, unknown utility or outlet conditions and optional investigations. A measured investigation scope is more useful than a firm reconstruction price based on an unverified section.
People also ask
Codes cited in this guide
This guide is written and reviewed against the published standards below. Always confirm the current adopted edition with the authority having jurisdiction.
Sources checked
- FHWA HEC-22: Urban Drainage Design, fourth edition, February 2024 Opened with curl on 2026-11-05, HTTP 200. Sections 4.2.2, 7 and 9 support the Rational Method, inlet capture and downstream hydraulic checks. A methods reference, subject to the project's accepted drainage criteria.
- ACI PRC-330.2-17: Industrial and trucking facility concrete site paving, reapproved 2020 Opened with curl on 2026-11-05, HTTP 200. Official public abstract confirms industrial lift-truck loads, trailer bearing and punching checks, support, thickness, joints and construction scope. Full design tables were not accessed.
- FHWA Geotechnical Aspects of Pavements: chapter 8, construction and design verification Opened with curl on 2026-11-05, HTTP 200. The 2006 reference manual discusses unbound-material acceptance, moisture and density, drainage construction, filters and protecting drain backfill and outlets.
- EPA industrial stormwater: 2021 MSGP and administrative continuance Opened with curl on 2026-11-05, HTTP 200. EPA reports expiration on February 28, 2026 and administrative continuation for facilities or operators covered before expiration. Determine the site's actual permitting authority and coverage.
- EPA 2022 Construction General Permit, as modified in 2025 Opened with curl on 2026-11-05, HTTP 200. Part 1.1 addresses coverage eligibility and the one acre or common-plan threshold; the permit states an expiration of February 16, 2027. Applies within its coverage areas and conditions.
- ULMA Civil F heavy duty trench drainage: product range and load classes Opened with curl on 2026-11-05, HTTP 200. Manufacturer lists D400, E600 and F900 product options and industrial applications. Verify the selected grate, channel and support detail against actual equipment loads.
- US Access Board ADA Standards: chapter 4, accessible routes Opened with curl on 2026-11-05, HTTP 200. Section 403.3 establishes walking-surface running and cross-slope limits where applicable. Check separate scoping, ramp, landing and parking provisions for the site.
- ASTM D6433-24: roads and parking lots pavement condition index surveys Opened with curl on 2026-11-05, HTTP 200. Official scope and significance statement identify PCI as a visual condition method and distinguish it from measurement of structural capacity. Full standard procedures were not accessed.
- Minnesota Department of Labor and Industry: 2026 and 2023 NEC permit-date applicability Opened with curl on 2026-11-05, HTTP 200. Primary adoption example: 2026 NEC applies to Minnesota electrical permits filed on or after August 17, 2026; earlier permits use the 2023 NEC. Other jurisdictions require their own adoption check.