Underground Drainage Systems and the Role of PVC Pipe: What Contractors Need to Know

Introduction

In both residential and commercial development, underground drainage systems play a crucial role in managing water flow, preventing erosion, and protecting structures. Whether you’re dealing with stormwater runoff, landscape drainage, or subsurface water control, the material you choose for piping can make or break your system’s performance and longevity.

At GP Distributors, we provide PVC pipe, fittings, and drainage solutions across Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. We work closely with contractors, builders, municipalities, and landscapers to supply high-quality, cost-effective piping for a wide range of underground drainage applications. Your one stop for PVC Pipe distribution.

In this blog, we’ll dive into how PVC pipe supports efficient underground drainage, what makes it the preferred choice in many projects, and how GP Distributors can help keep your timeline on track and your systems flowing.

Why Drainage Systems Matter More Than Ever

With changing weather patterns, rapid urban development, and increasingly impermeable surfaces, effective drainage systems are critical.

Poor Drainage Can Lead To:

• Foundation damage

• Water pooling and flooding

• Structural erosion

• Increased mosquito breeding grounds

• Landscape damage and turf die-off

• Mold and mildew growth

The right underground drainage system, built with the correct pipe type, layout, and grade, can eliminate these risks and protect your project investment.

Why PVC Pipe is Ideal for Underground Drainage

PVC (Polyvinyl Chloride) has been the go-to choice for contractors for decades—and for good reason.

Key Benefits:

• ✅ Corrosion-resistant

• ✅ Lightweight and easy to install

• ✅ High flow efficiency (smooth interior)

• ✅ Chemically resistant to soil and contaminants

• ✅ Cost-effective compared to alternatives

• ✅ Long-lasting (50–100 year lifespan)

PVC’s low maintenance and high durability make it a great fit for subsurface applications, especially when it comes to gravity-fed water movement.

Types of PVC Pipe Used in Drainage

At GP Distributors, we carry multiple types of PVC pipe suited for various underground drainage needs. Here’s a breakdown of the most common ones:

1. PVC SDR 35 (Sewer & Drain Pipe)

• Used for: Sanitary and storm sewer lines

• Features: Bell-and-spigot joints, 14 PSI pressure rating

• Benefits: Easy to assemble, durable under load, highly smooth interior

2. Schedule 40 PVC

• Used for: Heavy-duty drainage, irrigation, and pressure systems

• Features: Higher wall thickness, handles greater internal pressure

• Benefits: Extremely strong, useful in higher-load environments or near traffic

3. Perforated PVC Pipe

• Used for: French drains and subsurface water collection

• Features: Small perforations along the pipe to allow water entry

• Benefits: Great for lawn drainage, foundations, and retaining walls

4. Corrugated PVC Options (where applicable)

• Used for: Temporary or lightweight water diversion

• Features: Flexible coils, quick installs

• Benefits: Less rigid, not for heavy-load environments

Fittings That Make It Work

The success of your underground drainage system depends just as much on the fittings as the pipe.

Essential Fittings We Supply:

• Wyes and tees

• Elbows (22.5°, 45°, 90°)

• Reducers and increasers

• End caps and cleanouts

• Couplings (slip, repair, and flexible)

• Saddle taps for branch connections

We stock a wide variety of PVC fittings to match every pipe size and project configuration. Need something unique? We can special order it with fast turnaround.

Best Practices for Underground Drainage Installation

To get the most from your PVC pipe drainage system, following best practices is essential.

Key Considerations:

1. Proper Grading

Ensure at least 1% slope per 100 feet for gravity flow. Improper slope leads to backups and sediment buildup.

2. Correct Bedding

Lay the pipe on a stable, compacted bed of sand or gravel. Avoid sharp rocks or unstable soil.

3. Joint Sealing

Use primer and solvent cement on Schedule 40 or SDR 35 pressure joints. Proper sealing prevents leaks and root intrusion.

4. Cover Depth

Use at least 12–24 inches of backfill over the pipe, depending on load requirements. More depth is needed under driveways or roadways.

5. Access Points

Install cleanouts and access ports every 50–100 feet for easy inspection and future maintenance.

Drainage Applications That Use PVC

PVC is used across a range of industries for drainage purposes.

Whatever your drainage need, we have the PVC system and fittings to match.

Common Mistakes to Avoid

Even experienced contractors can run into trouble if the system isn’t designed or installed correctly.

Top Issues:

• Too little slope (causes water pooling)

• Using the wrong pipe for traffic zones

• Inadequate bedding leading to pipe collapse

• No access points for cleaning or repair

• Poorly sealed joints or mismatched fittings

Our team at GP Distributors helps you avoid these errors by guiding material selection and offering product consultations.

Why Choose GP Distributors?

We’re not just another pipe supplier—we’re your drainage materials partner.

What You Get with GP Distributors:

• ✅ Large inventory of PVC pipe & fittings

• ✅ Same-day pickup or scheduled delivery

• ✅ Coverage across TX, NM, OK, AR & LA

• ✅ Technical support and project guidance

• ✅ Competitive pricing on bulk orders

• ✅ One-stop access to related materials (HDPE, well casing, conduit)

Need a delivery to a jobsite? We’ll coordinate it so your team isn’t left waiting. Need special specs for a public works bid? We’ve got that, too.

Real-World Case: Drainage Project in San Antonio

Client: Civil construction contractor
Project: Drainage system for a 6-acre retail development
Scope:

• 1,500 ft of SDR 35 PVC

• Over 150 fittings including wyes, bends, and risers

• Multiple drop inlets and stormwater outfalls

GP Distributors Role:

• Delivered complete material list to site in two trips

• Coordinated with city compliance specs

• Provided on-call support for fittings and adjustments

Result: On-time completion, zero returns, and no pipe failures—helping the contractor stay under budget and ahead of schedule.

Frequently Asked Questions

Can PVC be used under driveways?

Yes—use Schedule 40 or reinforced SDR 35 with appropriate bedding and cover depth.

What sizes of PVC drainage pipe do you carry?

We stock common sizes from 2” to 18” in various schedules and SDR ratings.

Do you offer delivery?

Yes, we deliver throughout Texas, Oklahoma, New Mexico, Arkansas, and Louisiana—on jobsite or warehouse schedules.

Can I get a full drainage system design?

While we don’t offer full engineering services, our team can assist with product selection, fittings, and planning recommendations.

Final Thoughts: Keep Water Moving—and Profits Flowing

Underground drainage might be out of sight, but it’s never out of mind. Poor drainage design or low-quality materials can lead to major problems—and expensive rework.

At GP Distributors, we make sure you get the right PVC pipe, fittings, and support to complete your drainage project right the first time.

Need Help with an Upcoming Drainage Project?

📞 Call our team to discuss your job specs
📍 Serving Texas, Oklahoma, New Mexico, Arkansas & Louisiana
🌐 www.gpdistributorsusa.com
🛒 Bulk orders, technical support, and fast delivery—GP Distributors has you covered.