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Professional-Grade Nutrient Loading Analysis Tool for Florida Engineers

Model your treatment train, hit FDEP removal targets, and export a submittal-ready Technical Report - in hours, not weeks.

The audit takes about two minutes: draw your project boundary, see which performance standard applies, and get your exact price. No account needed.

Built for submittals in all five Florida Water Management DistrictsSFWMDSJRWMDSWFWMDNWFWMDSRWMDFDEP6,894 WBIDs covered statewide

What SWMLabs Does

Site classification, automatic

Draw the boundary. SWMLabs determines the project's HUC12, rainfall characteristics, existing Land Use and Soil coverages, and downstream Impaired Waterbodies and Outstanding Florida Waters, automatically establishing the Nutrient Loading reduction requirements.

§ 8.3.3 to 8.3.4 · FDEP · SSURGO

Nutrient loading, done for you

Pre- and Post-Development Annual Runoff and TN/TP Loadings for every Land Use, straight from the Appendix N runoff coefficient tables, automatically interpolated by Meteorological Zone, DCIA %, and non-DCIA Curve Number.

Appendix N · Harper and Baker (2007)

BMPs routed on a canvas

Drop in BMPs and connect them in the order stormwater moves. Volume, Concentration, and Load update at every node, perfect for testing BMP performance and refining your system's design. The routing diagram draws itself and drops straight into your submittal Report.

Appendix O · per-node treatment train

Technical Report, submittal-ready

Every methodology, every worksheet, every determination, and an Override Log of your judgment calls. No black box. No mystery calculations. Just a fully transparent report, ready for approval.

PDF · seven parts

  1. Project location: county, district, rainfall, and meteorological zone resolved from the boundary
  2. Pre-development catchments drawn over the land use map
  3. Non-DCIA curve number worksheet, weighted by land cover and soil group
  4. Pre-development runoff volume by land use: area, rainfall, and runoff coefficient
  5. Pre-development TN and TP loading by land use
  6. Post-development catchments and outfall pins with the downstream flow path
  7. Post-development runoff coefficients by land use, DCIA, and curve number
  8. Post-development runoff volume by catchment and by outfall
  9. Appendix N runoff coefficient table, interpolated for the project's zone
  10. Post-development nutrient loading, catchment by catchment
  11. BMP treatment train routed on the canvas, loads updated at every node
  12. Loading Summary: Post less than or equal to Pre and the Locational test, per nutrient
  13. Generate the Technical Report, section by section

With and without SWMLabs

The same ERP submittal, step by step: how it gets done by hand today, and what SWMLabs does instead. It replaces the spreadsheet and the separate BMP sizing tool with one workspace - the same Harper and Baker (2007) methodology, one report, every derivation shown.

  1. Site classification

    Without SWMLabsRegulatory maps checked manually, flowpath traced by hand

    With SWMLabsRegulatory classifications automatically derived from the boundary and each outfall

  2. Runoff coefficients

    Without SWMLabsAppendix N tables interpolated manually, row by row

    With SWMLabsAppendix N automatically interpolated for every land use row, work shown

  3. Nutrient loading

    Without SWMLabsLoads calculated manually in a spreadsheet, checked twice

    With SWMLabsTN and TP automatically computed and documented, line by line

  4. BMP sizing

    Without SWMLabsBMPs sized manually in a separate tool, removals stacked by hand

    With SWMLabsBMP worksheets automatically built on the canvas, node by node

  5. Routing diagram

    Without SWMLabsRouting diagram redrawn manually in CAD for the submittal

    With SWMLabsRouting diagram automatically captured from the canvas

  6. Design revisions

    Without SWMLabsEvery downstream sheet redone manually after each design change

    With SWMLabsDownstream loads automatically recompute, worksheets flagged for review

  7. The report

    Without SWMLabsNarrative and appendices assembled manually

    With SWMLabsEvery derivation automatically shown, with Override Log and Verification ID

Where to start

Have a project in hand?

Run the Free Project Audit. It resolves the HUC12 and downstream Impaired Waters and Outstanding Florida Waters, then prices the project. About two minutes, no account.

Just looking?

Explore the live demo. Real Florida projects with every page open - no account, no install.

Photo: Aaron Volkening, CC BY 2.0, cropped

See a real Technical Report

A complete report generated by the platform for a Hardee County project, ready for ERP submittal. This is the deliverable.

  • Every derivation shown: Appendix N interpolation, efficiency curves, Appendix O lookups, exactly as calculated.
  • An Override Log of every value the Engineer of Record substituted, original and replacement side by side.
  • A Verification ID on every report that a reviewer or client can check online, no account needed.

Built by Engineers Who've Done the Work

combined Florida land development PE experience
30+ years
Outstanding Technical Achievement Award recipient
FES

Built by licensed Professional Engineers who have spent their careers navigating Florida's ERP permitting process, not software developers guessing at regulatory requirements. Every feature in SWMLabs reflects methodology that has been tested against real projects and real submittals.

What engineers are saying

I love the BMP routing diagram! I typically make a BMP map for my submittals and this would eliminate that need. I also appreciate the explanations of the methodology at each calculation step - it's almost as if you are walking through it with a reviewer.

Jessie P., P.E.

Tampa, FL

In my experience, SWMLabs is an intuitive application that knocks hours off of BMP development. Geolocated HUC12, soils, and land use information makes project setup quick and easy. The interface for setting up BMPs is strait forward and easy to adjust. Finally, the reporting is thorough and makes a great addition to the drainage narrative.

Jeff T., E.I.

Clearwater, FL

The overall user experience is very good. I can tell a lot of time went into the layout and careful placement of the tools.

Joel B., P.E.

Fort Myers, FL

I like the look and feel, the workflow and the GIS integration.

Mark T., P.E.

Tallahassee, FL

This platform makes nutrient removal modeling visual, intuitive, and efficient, allowing users to confidently develop accurate models and produce a complete report ready for regulatory submittals.

Luis C.

Orlando, FL

Two ways to use SWMLabs

Subscribe for your firm's whole portfolio, or price one project at a time - both end in the same submittal-ready Technical Report.

14-Day Free Trial

Firm Subscription

One predictable number for your whole firm

From $400 /seat /mo

  • Unlimited projects up to your plan's acreage ceiling - Technical Reports included
  • No charge today: nothing is billed until day 14 or your firm's first Technical Report

Pay Per Project

A flat price by project acreage - no subscription required

From $300 /project

  • A Free Project Audit shows the exact price before you commit

See what your project costs - for free.

No account needed. Results in under two minutes.