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AI drafting for site utility plans

AI Site Utility Plan Drafting

A site utility plan has to tie four or five utility systems to the building, to the public mains, and to each other without a crossing conflict, and every grading or building footprint change moves the inverts. Nomic drafts water, sanitary, storm, and dry utilities in CAD from the civil engineer's design, fills the structure tables, and checks separations and crossings against the agency standards you name before your civil engineer reviews and stamps.

Start for freeAll drafting work
Last reviewed: November 2026

You send

  • The civil engineer's markups, sketches, or design criteria
  • Topographic and utility survey with existing mains
  • Grading plan and building footprint backgrounds
  • Plumbing and electrical sheets showing service entry points
  • Local agency standard details and your civil CAD standards

Nomic hands back

  • Site utility plan as a DWG file on your civil layers
  • Storm and sanitary structure tables in Excel and on the sheet
  • Crossing and separation callouts at every utility conflict
  • A list of open questions for the civil engineer of record
420416412PROPOSED BUILDINGFFE 418.50WWSMH-1RIM 412.30SMH-2RIM 410.85SMH-3RIM 409.12CBCBPROPERTY LINE8" PVC SAN @ 0.50%1ASITE PLANSCALE: 1" = 30'-0"N1234CONSULTING ENGINEERSREVISIONS1ISSUED FOR REVIEWPROJECTWESTFIELD LABSSCALE1" = 30'-0"DATE06/10/2026KEY PLANSHEET TITLESITE PLANSHEET NUMBERC-101

On the sheet

Site Plan, annotated

A civil site plan with contours, the property line, parking, and utilities connecting to the building.

  1. 1Property line
  2. 2Sanitary sewer with manhole rim elevations
  3. 3Water service and storm drain
  4. 4Existing contours with elevations

The problem

Inverts, crossings, and structure tables all move together

On a typical commercial site, the utility plan carries a domestic water service and a separate fire line with a backflow preventer, a sanitary lateral with cleanouts at every bend, a storm system with 15 or 20 inlets and manholes, and primary electric and telecom duct banks to the building. Each structure needs a rim elevation and every pipe in and out of the structure needs an invert, size, material, and slope, typed into a structure table that changes whenever the grading plan does.

The coordination points are where the errors live. The sanitary invert at the building has to match the plumbing engineer's building drain, the water line has to keep its separation from sewer at every crossing the reviewing agency checks, and the fire line has to meet the hydrant and FDC locations the fire marshal approved. A crossing called out with 12 inches of vertical clearance when the local standard asks for 18 is a plan check comment, or a field change.

01 / Draft

Utilities drawn on the site plan from the civil design

Attach the civil engineer's markups or design sketches, the survey with existing utilities, and the grading plan. Nomic draws each system on your civil layers with pipe labels for size, material, and slope, places structures with their labels, and runs services to the building at the points the plumbing and electrical engineers show.

  • Domestic water, fire service, hydrants, valves, and backflow assemblies
  • Sanitary laterals, cleanouts, and manholes with inverts and slopes
  • Storm inlets, pipes, and outfalls plus electric, telecom, and gas routing
02 / Tables

Structure tables filled from the same geometry

Nomic builds the storm and sanitary structure tables in Excel and on the sheet from the pipes and structures it drew, so rims, inverts, and pipe sizes agree with the plan labels. When the grading plan changes, rims and inverts update in the table and on the labels together.

  • Rim, invert in, invert out, and pipe size for every structure
  • Pipe tables with length, slope, and material
  • Rims taken from the current grading surface
03 / Check

Separations and connections checked before review

Nomic checks its own plan against the standards you name: horizontal and vertical separation between water and sewer, cover over pipes, and the connection inverts the plumbing drawings expect at the building. Everything it drew is clouded and the open questions go to the civil engineer.

  • Water and sewer separation checked at every crossing
  • Building connection inverts compared with plumbing sheets
  • Hydrant and FDC locations compared with the fire access plan

Checked against

The code and documents behind every sheet

Name the editions the project is designed to and Nomic checks its own drawing against them before handing it back. Your engineer or architect of record makes the final call and stamps the set.

  • Local water, sewer, and stormwater agency standards
  • Ten States Standards for water and sewer separation
  • NFPA 24 for private fire service mains
  • International Fire Code hydrant and FDC requirements
  • International Plumbing Code for building services
  • Your firm civil CAD standards

How it works

From a sentence to a stamped set

  1. Step 1

    Ask for the drawing

    Say what the sheet needs to show and attach the backgrounds, markups, cutsheets, or photos. A sentence is enough to start.

  2. Step 2

    Nomic drafts it in CAD

    Nomic works in CAD on its own computer, on your layers and blocks, following how your firm drew the same thing before. It saves real DWG files to the project.

  3. Step 3

    Nomic checks its own work

    The drawing is checked against the code editions you name and the source documents. Everything Nomic drew is clouded, and open questions are listed.

  4. Step 4

    Your team reviews and stamps

    Your engineers and architects review the clouded changes, make the final call, and issue the set under their own stamp.

FAQ

Frequently asked questions

Yes. Nomic works in CAD on its own computer and saves the utility plan as a DWG file. It draws water, sanitary, storm, and dry utilities from the civil engineer's design, fills the structure tables, and checks separations and building connections before the engineer reviews it.

No. The civil engineer designs the systems, sets pipe sizes and slopes, and stamps the plan. Nomic drafts from that design, can compute inverts and slopes from the criteria the engineer sets, and flags anything outside those criteria, but the final call stays with the engineer.

Nomic checks against whichever standards the project is held to. Many state agencies follow the Ten States Standards for water and sewer separation, and many cities publish their own utility details. Tell Nomic which standards apply and it checks every crossing and parallel run against them.

Nomic reads the plumbing sheets for the building drain invert, the water service size, and the fire service entry, then connects the site utilities at those points. Any mismatch between the site invert and the plumbing invert goes on the question list.

No. Nomic drafts in CAD on its own computer and saves DWG files you open in AutoCAD or any DWG editor. It does not edit Civil 3D surfaces or pipe networks, so teams that model utilities in Civil 3D use Nomic for the sheets, tables, and checks around the model.

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What is a site plan?

The sheet showing the building, paving, and utilities on the lot.

What is a grading plan?

Contours and spot elevations that set rims and inverts.

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AI Site Utility Plan Drafting: Water, Sewer, Storm DWGs | Nomic