Civil / water resources / dam engineer in the Blue Ridge (you may know me as Hydro Engineer). I build the HydroComplete ecosystem — formula-transparent water-resources software that meets engineers on whatever platform they already work in: the browser, QGIS, Civil 3D, OpenRoads, or a Python console. Single-file HTML games at night.
One family of real hydrology & hydraulics engines, many front doors:
| Platform | Project | What |
|---|---|---|
| Desktop | stormsewer | StormSewer — a free, GPL storm sewer design app for Windows, macOS and Linux. Rational method, Manning across four conduit shapes, standard-step HGL/EGL, HEC-22 inlets with bypass carryover, auto-sizing, submittal PDF reports. brew install --cask mf4633/tap/stormsewer · winget install MichaelFlynn.StormSewer · direct download |
| Browser | hydrocomplete.com | Full stormwater design suite — four calculation engines, live USDA/NOAA data, KaTeX-transparent formulas |
| QGIS | hydrocn-qgis | Free GPL plugin: SCS Curve Number from SSURGO + NLCD + DEM slope + NOAA Atlas 14, fetched automatically, with an ESA WorldCover backup source |
| Civil 3D | hydrocomplete-civil3d | Stormwater hydraulics add-in — Rust/WASM calculation DAG inside AutoCAD Civil 3D |
| Open CAD Studio | OpenCADStudio · H&H plugin · storm sewer plugin | Rust-native CAD with hydrology/hydraulics add-ons |
| Engines & libraries | stormsewer · hydro-tools · hydrocomplete-dag | The storm sewer engine as an embeddable Rust crate — cargo add stormsewer, also compiled to WebAssembly for in-browser calculators · open hydrology primitives · WASM model builder |
| Research | swmm-breach · ALR | Dam-breach hydrographs for SWMM · vortex-particle scour screening |
| Project | What | Stack |
|---|---|---|
| hydrocomplete.com | Browser-based stormwater engineering — four real calculation engines (Sedimentology, Water Quality, H&H, Conveyance), live USDA soil data, NOAA rainfall, formula transparency via KaTeX. Subscription SaaS. | Node/Express on Fly.io · Supabase · Stripe · Netlify static frontend |
| pe-calc.com | 60+ free engineering calculators — hydraulics, dam safety, environmental, geotech, structural, transportation, mechanical, electrical, chemical. AdSense-supported. | Static HTML/JS · Netlify |
| siteprior.com | $29 property due-diligence reports — federal flood zones, soils, slope, wetlands. Single-page checkout. | Static frontend · same Fly backend as HydroComplete |
| boardgaminghub.com | 30+ free in-browser games & sims — chess, go, mancala, plus originals (Bisque, Aresia, Doctrine) and physics sims (Apoapsis, Floodline, Tower). Each one a single HTML file. | Vanilla JS, Canvas, Three.js where it earns its keep |
Drop-in scripts for the three major civil platforms. Every routine is one file, named for the command it adds.
- C3D-AutoCAD — 23 LISP commands for AutoCAD / Civil 3D (LABELACRES, BD, SLP, FLAT, CHZ, T2M, BC, PA, ...).
- Carlson-CAD — 22 LISP commands for Carlson Civil/Survey, survey-first (LABELAC, LOTBD, PNORENUM, PNOINV, TRAV, FBREP, STALBL, ...).
- OpenRoads_vba — 24 VBA subs for Bentley OpenRoads Designer (LabelAcres, PointsIO PNEZD I/O, StationOffset, LevelTranslate, ZTools, ...), shipped as importable
.bassource.
- swmm-breach — pip-installable dam-breach hydrograph generator for EPA SWMM / PCSWMM. Froehlich (2008) implemented, Teton validation case included.
- ALR — physics-based vortex particle simulation as a Manning's-equation alternative for open-channel scour screening. 109 tests, MIT-licensed.
- eclipse-predictor — 3D solar eclipse paths computed live from Meeus / ELP-2000, NASA catalog dates, single HTML file.
- board-gaming — every game on boardgaminghub.com, one HTML file each.
- Hellcats-Flight-Sim — WWII Pygame flight sim, F6F Hellcat with carrier ops and AI opponents.
- flappy-modern — Flappy Bird clone with coins, shield, day/night, slow-mo close calls.
- Real formulas over abstractions. If a tool reports a number, it should show the equation it came from.
- Single-file HTML deliverables. No build step, no framework lock-in, no broken links in five years.
- Engineering software that respects engineers' time and their licenses.
- Web: hydrocomplete.com · pe-calc.com · siteprior.com · boardgaminghub.com
- Location: Asheville, NC