Storm sewer structures are one of those project components that can either keep a schedule moving or quietly derail it. When the specification is clear, the submittals come back clean, the structures arrive ready to set, and the crew moves on. When the specification is vague or incomplete, the result is RFIs, resubmittals, field coordination problems, and days lost that no one planned for. So what makes a storm sewer structure specification tight enough to avoid all of that? The answer lives in understanding which products are available, which standards apply, and what information reviewers actually need to approve a submittal on the first pass.

Why Engineers and Contractors Specify Precast Instead of Cast-In-Place for Storm Structures

The choice between precast and cast-in-place for storm sewer structures is not a close call for most Texas drainage projects, and it rarely comes down to preference. It comes down to schedule, quality control, and field conditions – and precast wins on all three.

Cast-in-place structures require excavation, formwork, reinforcement placement, concrete pours, curing time, form stripping, and backfill – all sequenced across multiple trades, all exposed to whatever weather Texas decides to deliver that week. Every one of those steps is a potential delay. Precast eliminates most of them. A structure manufactured in a controlled plant environment and delivered to the job site ready to set means the excavation and the set can happen in the same day. The hole stays open for hours, not days.

Quality control is another dimension where precast has a clear advantage. Concrete poured in a plant under consistent temperature and humidity conditions, with controlled mix designs and documented testing, produces a more uniform product than field-poured concrete subject to heat, inconsistent batching, and the pressures of an active job site. In Texas summers, where extreme heat can accelerate curing and affect concrete strength development, the controlled environment of a precast plant is not just more convenient – it is more reliable.

For Texas sewer construction projects operating under tight schedules and compressed budgets, precast storm sewer structures reduce on-site labor requirements, shorten the duration of open excavations, and eliminate the coordination headaches that come with managing multiple trades around a wet concrete pour.

What ASTM Standards Apply to Precast Concrete Storm Sewer Structures?

Three ASTM standards govern the manufacture and structural design of precast storm sewer structures, and getting them right in the specification is what gives the submittal reviewer a clear path to approval.

• ASTM C913 – Standard Specification for Precast Concrete Water and Wastewater Structures. This is the governing standard for the manufacture of precast concrete structures used in storm and wastewater applications. It covers concrete mix requirements, reinforcement, dimensional tolerances, and structural performance expectations. When a structure is produced to C913, the engineer and the reviewer have a consistent, verifiable manufacturing baseline to work from.
• ASTM C890 – Minimum Structural Design Loading for Monolithic or Sectional Precast Concrete Water and Wastewater Structures. This standard defines the loading conditions that precast structures must be designed to resist – soil pressure, hydrostatic loads, and live loads from traffic or equipment above. Specifying compliance with C890 ensures the structure is not just geometrically correct but structurally appropriate for the burial depth and loading environment of the project.
• ASTM C478 – Standard Specification for Precast Reinforced Concrete Manhole Sections. This is the foundational standard for circular precast structures used in storm and sanitary drainage applications. It governs wall thickness, concrete strength, reinforcement design, and joint requirements. C478 is one of the most referenced standards in storm drainage specifications across Texas municipalities and has been the backbone of precast manhole quality requirements since the early days of the modern sewer system.

All of our precast storm sewer structures at AmeriTex Pipe & Products are produced in accordance with ASTM C913, C890, and C478. That alignment with the three primary standards is what allows our structures to clear plan review and submittal approval without back-and-forth over compliance questions.

What Information Is Typically Required on Storm Sewer Structure Submittals?

Submittal problems are almost always specification problems in disguise. When the required information is clearly defined upfront, the manufacturer knows exactly what to provide and the reviewer knows exactly what to check. When it is left vague, everyone fills in the gaps differently and the resubmittal cycle begins.

A clean storm sewer structure submittal for a Texas drainage project typically includes the following:

• Product identification – the pipe designation, structure type, size, and applicable ASTM standards the product is manufactured to
• Manufacturer identification – the name, trademark, and plant location where the structures were produced
• Date of manufacture – relevant for quality assurance and traceability
• Testing lot or lab stamp – confirming the product was tested in accordance with applicable standards
• Shop drawings – showing inside dimensions, wall thickness, reinforcement configuration, pipe opening locations, invert elevations, and any custom features specific to the project
• Concrete mix design and compressive strength data – confirming the concrete meets or exceeds the specified minimum strength
• ASTM compliance documentation – identifying which standards the product is manufactured to and any third-party certifications

The level of detail required can vary by municipality and project type, but these categories cover what most Texas sewer construction reviewers will ask for. When the manufacturer has already produced the structure to documented ASTM standards and maintains organized plant records, most of this information is readily available and the submittal package comes together quickly.

At AmeriTex, we work closely with project teams to make sure the documentation that goes into a submittal package reflects exactly how our structures are made. That transparency makes reviews faster and reduces the back-and-forth that slows projects down.

Sizing and Customization: What AmeriTex Produces for Storm Applications

Matching structure size to the drainage design is where a lot of specifications go wrong – either by defaulting to a catalog item that does not quite fit the hydraulic design, or by over-specifying custom work when a standard product would have done the job.

Our precast storm sewer structures range from 18-inch by 18-inch catch basins up to 96-inch by 96-inch storm manholes, covering the full range of typical Texas drainage applications from residential development to major municipal stormwater systems. For projects that fall outside those standard dimensions, we can produce practically any size or configuration that a storm sewer design requires. Our only practical limit is the ability to safely lift the product onto a truck and deliver it to the job site – which covers a very wide range of structure sizes.

Standard structures from inventory ship quickly, which matters on active Texas construction schedules. Custom structures can be produced when the design demands it, with lead times coordinated directly with our production and project management teams.

What Specifying Precast Storm Structures Means for Your Project Schedule

The connection between what gets specified and how the job runs in the field is more direct than it sometimes appears on paper. A specification that calls out the right ASTM standards, defines the required submittal information, and correctly matches structure sizing to the design does more than satisfy plan review. It creates the conditions for a clean install – structures that arrive on time, fit the design as drawn, and allow the crew to move forward without waiting for field modifications or re-ordering.

In Texas sewer construction, where active development and compressed schedules are the norm across most major markets, that kind of specification discipline is not administrative detail. It is schedule protection.

With manufacturing facilities in Seguin and Conroe, AmeriTex Pipe & Products serves Central Texas, the Gulf Coast, and East Texas with precast storm sewer structures built to the standards that project reviewers expect and delivered on the timelines that project schedules require.

The Right Structure Starts with the Right Specification

A well-written precast storm sewer structure specification is one of the highest-leverage decisions an engineer makes on a drainage project. It sets the quality floor, defines the submittal path, and determines whether the contractor can install quickly or will spend days chasing down missing information and corrected shop drawings.

ASTM C913, C890, and C478 provide the quality framework. Clear submittal requirements provide the review pathway. And sourcing from a manufacturer with the capacity, documentation, and production flexibility to deliver on both sides of that equation is what closes the loop from spec to install.

If you are working on a storm drainage project in Texas and need precast structures that arrive spec-compliant and submittal-ready, reach out to AmeriTex Pipe & Products. Our team can help you match product sizing to your design and make sure the documentation package is ready before the deadline.

Frequently Asked Questions

What is the largest precast storm sewer structure AmeriTex Pipe & Products manufactures as a standard product?

Our standard precast storm sewer structures range from 18-inch by 18-inch catch basins up to 96-inch by 96-inch storm manholes. For projects that require structures outside those standard dimensions, we can produce custom sizes for nearly any storm sewer application, with our practical limit being the ability to safely transport the finished product to the job site.

Do AmeriTex’s precast storm structures come with documentation supporting ASTM compliance for submittal packages?

Yes. Our structures are manufactured in accordance with ASTM C913, C890, and C478, and we maintain the plant records, mix design data, and quality control documentation needed to support submittal packages for Texas drainage projects. Working with us early in the submittal process helps ensure that documentation is organized and ready when plan reviewers need it.

Can AmeriTex produce precast storm structures with custom pipe opening locations and invert configurations?

Yes. When a project’s drainage design requires specific pipe penetration locations, invert elevations, or non-standard configurations, we can accommodate those requirements in production. Custom shop drawings are developed to reflect project-specific details, which gives the submittal reviewer a clear picture of exactly what will be installed.