AI drainage report writer for solo civil engineers

Two things changed. First, the incumbents went AI-first at the enterprise end: Bentley now markets OpenSite+ as AI-powered site design, Autodesk is layering automation into Civil 3D, and Esri-backed startups automate detention-pond design for large developments. None of that reaches a solo engineer doing a 12-lot subdivision. Second, the solo engineers moved first on their own: the r/civilengineering thread 'How are you using AI in land development' reports AI already drafting report sections and catching inconsistencies, and a separate thread asks outright whether any civil-engineering-specific AI tool exists. The demand is proven by improvisation. Meanwhile the economics of the solo shop are public on Reddit — one founder reports about 70 projects in the firm's first 2.5 years and a $275K–$300K revenue year; another with a single employee is on track to bill $600K — so a $59/mo tool that removes a day of writing per submittal is priced far below its value. The window is the 12–24 months before a Bentley or Autodesk bundles 'AI report' into a $3K seat.

Market gap

Civil software is split into two shelves and neither holds the document. Shelf one is design: Civil 3D, Carlson Civil (a $2,050 seat at Carlson resellers), Bentley OpenSite+ — they compute grading and pipes but the report is a Word template the engineer fills by hand. Shelf two is hydrology: HydroCAD (annual license from $195) and Hydrology Studio produce the numbers and a printout, not the narrative, the methodology, or the jurisdiction checklist. The new AI entrants skip the document too: civils.ai sells takeoffs and drawing checks from $90/mo, Monograph ($45–$490/mo) sells project and invoicing management to A/E firms. The gap is the writer that sits between the calc and the reviewer: a tool that knows what a stormwater report must contain in this county, drafts it from the engineer's own outputs, and after the review comes back drafts the point-by-point response letter. For a one-PE shop doing dozens of submittals a year, that is the single largest block of unbilled hours — and no vendor is selling it at a price a solo engineer would put on a personal card.

Week 1-2: talk to 10 solo land development PEs (r/civilengineering 'started my own firm' posters are a warm list); collect 5 real drainage reports and the county checklists they follow. Week 3-6: ship the MVP — upload HydroCAD/Hydrology Studio output + grading plan PDF + checklist → drainage report DOCX in the engineer's template; Stripe, $59/mo, 14-day trial. Week 7-8: comment-response mode — upload the reviewer's comment letter, get a point-by-point response with sheet/calc cross-references. Month 3: jurisdiction library (checklists for the 20 counties your first users work in), Firm tier, referral credit. Month 4-6: content on 'drainage report example' and 'stormwater report template' (open SERP, no software brands ranking), plus a directory of county checklists as the SEO magnet.