Infiltration Trench Sizing Calculator

Professional Infiltration Trench Sizing Calculator

Managing stormwater runoff effectively is critical for civil engineers, landscape architects, environmental consultants, and property developers. Whether you're designing sustainable urban drainage systems (SUDS), meeting local stormwater regulations, or planning green infrastructure projects, accurate infiltration trench sizing is essential for project success.

This Infiltration Trench Sizing Calculator helps you determine the correct trench dimensions based on your site's drainage area, soil infiltration rates, rainfall intensity, and design specifications. Instead of manual calculations or complex spreadsheets, you can get instant, reliable sizing recommendations that account for stone void ratios, drawdown times, and safety factors.

Why Use Paperform for Your Engineering Calculators?

Traditional engineering calculations often live in Excel files that are hard to share, difficult to update, and impossible to embed on your website. Paperform transforms your technical calculations into professional, client-facing tools that work anywhere.

For civil engineering firms and environmental consultants, this calculator template can be customized with your company branding and embedded directly on your website as a lead generation tool. Potential clients can get immediate value while you capture their contact information and project details. The form automatically emails results to both you and the client, creating a natural conversation starter about your design services.

For municipal planning departments, you can deploy this calculator as a public resource for developers and contractors, ensuring consistent sizing approaches across all projects in your jurisdiction. The form can be set up to collect project location data, creating a database of planned stormwater infrastructure.

For landscape architects and site designers, this tool helps you quickly evaluate multiple design scenarios during the conceptual phase. You can test different trench configurations, compare options, and share professional calculations with clients and permitting authorities.

How the Calculator Works

The form guides users through entering key project parameters:

• Contributing drainage area – the total area that will drain to the infiltration trench
• Rainfall design intensity – based on your local climate and design storm requirements
• Soil infiltration rate – determined through on-site percolation testing or soil classification
• Trench dimensions – width, depth, and length considerations
• Stone void ratio – typically 0.3-0.4 for standard drainage aggregate
• Required drawdown time – how quickly the trench must drain after a storm event (usually 24-72 hours)

The calculator uses these inputs to compute the required trench volume, minimum trench length, and verify that your design meets drawdown time requirements. Real-time calculations update as users adjust parameters, making it easy to optimize the design.

Automate Your Engineering Workflow with Stepper

Once someone submits their trench sizing request, you don't want that information sitting in your inbox. Connect this form to Stepper (stepper.io), Paperform's AI-native workflow automation platform, to:

• Automatically create project records in your CRM or project management system
• Send detailed calculation reports with diagrams and specifications
• Route complex or large-scale projects to senior engineers for review
• Update design databases with regional soil conditions and trench performance data
• Trigger follow-up email sequences for quote requests or design consultation bookings

For example, when a developer submits a trench sizing request for a 2-acre commercial site, Stepper can automatically create a new opportunity in your CRM, send a detailed PDF report with the calculations, and schedule a follow-up call with your business development team—all without any manual work.

Collect Payments for Engineering Services

If you offer this as a premium service or want to charge for detailed design reports, Paperform's built-in payment processing makes it simple. Connect Stripe, PayPal, or Square to collect one-time fees for calculation services, or offer monthly subscriptions for contractors who need regular access to your engineering calculators.

You can also create tiered pricing: basic calculations are free (great for lead generation), while detailed reports with CAD drawings, material specifications, and stamped calculations require payment.

Designed for Technical Accuracy and Professional Presentation

Unlike generic form builders, Paperform's calculation engine can handle complex engineering formulas with multiple variables, conditional logic, and nested calculations. You can build sophisticated tools that rival custom software, but deploy them in minutes instead of months.

The visual editor lets you add:

• Instructional diagrams showing cross-sections of infiltration trenches
• Help text explaining technical terms like void ratio and hydraulic conductivity
• Conditional fields that appear based on soil type or site constraints
• Range validators to ensure inputs fall within reasonable engineering parameters
• Reference tables for standard values like void ratios for different aggregate types

Your calculator can look like a professional engineering tool, not a basic survey form.

Who Benefits from This Template?

Civil engineers and environmental consultants can use this as a client-facing tool that demonstrates expertise while capturing project leads. Embed it on your services page alongside case studies and client testimonials.

Stormwater management companies can offer this calculator as a free resource for contractors and developers, positioning your firm as the go-to experts when they're ready to move forward with design and installation.

Municipal engineers and planners can provide this tool to developers as part of pre-application consultations, streamlining the permitting process and ensuring calculations are done correctly from the start.

Landscape architects can use this during site analysis and preliminary design to quickly evaluate stormwater management strategies and communicate recommendations to clients.

Real estate developers can run quick feasibility calculations to understand site constraints and stormwater infrastructure costs before purchasing land.

Trusted by Engineering and Consulting Firms Worldwide

Paperform is trusted by over 500,000 teams globally and is SOC 2 Type II and GDPR compliant, giving you the security and reliability that professional services firms require. Your calculation data is encrypted, backed up, and accessible only to authorized users.

With over 30,000 designer templates, native integrations with the tools engineers already use (AutoCAD, Bluebeam, Procore, and more via Stepper or Zapier), and a pricing model that scales with your firm, Paperform is built for growing engineering and consulting practices.

Whether you're a solo consultant looking to professionalize your service delivery or a multi-office firm standardizing calculations across teams, this Infiltration Trench Sizing Calculator template gives you a powerful foundation to build on.

Start capturing more leads, streamlining your design process, and demonstrating your technical expertise with a calculator that works as hard as you do.