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Free AutoCAD civil site utility symbols (DWG): manholes, storm drains, water, gas, power, survey marks

Civil site utility plan: 222 ready-made AutoCAD blocks (DWG), free to download and use in your own projects, as a ZIP or one symbol at a time.

222 blocks at real size for site utility and drainage plans: manholes and chambers (storm, sanitary, combined, water, telecom, electric and gas, 900 to 2400 mm, rectangular chambers, drop, backdrop, shallow, terminal, existing and abandoned manholes, inspection chambers, rodding eyes, cleanouts, oil interceptors, grease and silt traps, wet wells and valve vaults); inlets, culverts and drainage structures (gullies, kerb and grate inlets, slotted and channel drains, headwalls, box and pipe culverts, flared ends, outfalls with flap valves, riprap, ditches, swales, soakaways, infiltration trenches, rain gardens, detention ponds and tanks, flow control and weir chambers); water supply and fire protection (hydrants, fire department connections, valves, meters, backflow preventers, tapping sleeves, thrust blocks, bends, tees, reducers, tanks, towers, pump stations, boreholes and wells); gas, power and telecom items (valves, meters, wood, concrete and steel poles, guy wires, transformers, switchgear, pull boxes, handholes, vaults, street lights, pedestals, cabinets, signal poles and masts); new, existing, abandoned and overhead pipe and cable lines with their codes, duct banks, casings and joint trenches; pipe trench, duct bank and manhole sections; kerbs, ramps, walls, fences, guard rails and steps; and civil tags and survey marks (structure and pipe tags, invert, spot elevation, benchmarks, control points, monuments, boundary marks, north arrow, flow and slope arrows, match line and section mark)

Download ZIPPreview in browser

Using AutoCAD 2017 or an earlier version? Download the 2010 format

Copyright CADXChange. Use and modify the symbols freely in your own drawings and projects, including commercial ones; credit and a link are needed only when you publish them. Please do not redistribute or resell the library. Each ZIP holds one plain DWG file in AutoCAD 2018 format and a README; no add-in needed. Provided as is, without warranty. Library terms (CXL-1.0)

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Attributes for parts lists

Every block carries a tag you can number and invisible attributes for the schedule. A structure holds ITEM_TYPE, SIZE, MATERIAL, RIM_ELEV_M, INVERT_ELEV_M, DEPTH_M and PIPE_SIZE_MM; a water item holds SIZE_MM, PRESSURE_RATING, MATERIAL and ELEVATION_M; a power or telecom item holds SIZE, VOLTAGE, OWNER and HEIGHT_M; a line holds SIZE_MM, MATERIAL, SLOPE_PCT, LENGTH_M and STATUS (new, existing or abandoned); a section holds BEDDING and COVER_MM.

Export the blocks of a utility plan to Excel with BlockSync to list manholes with their rim and invert elevations, valves, hydrants and poles as a structure schedule, check the numbering and write the corrections back in one run, with preview and backup.

How to use the library

  1. Unzip the file and open the DWG. Copy the symbols you need into your plan, or drag the blocks in from DesignCenter (ADCENTER).
  2. The blocks are drawn at real size in millimetres, 1 drawing unit = 1 mm. If your site drawing is in metres, insert the blocks with a scale of 0.001 (or in millimetres at 1:1 on a sheet at the plot scale). A 1200 mm manhole is then 1.2 m on the plan, and a tag letter stays readable at 1:500.
  3. Round structures, poles and fittings are centred on their middle, so you snap them onto the pipe node. Line blocks lie along the x axis, centred, with a gap for the code (SD, SS, W, G, E, T) and are scaled to the length of the run; new lines are drawn in full weight, existing lines in a thin weight, abandoned lines dashed and crossed, overhead lines dashed with a dot at each end.
  4. Sections show a pipe trench with cover, bedding and optional concrete surround, duct banks, a pipe in casing and a precast manhole with cone, steps and base. They are details to put on a sheet next to the plan, not parts of the plan; the plan blocks and the section blocks use the same sizes.

About the drawings

There is no single standard for the drawings of site utility plans. The blocks follow the common practice of civil and utility drawings: a manhole as a circle with its code, a hydrant as a circle with FH, a valve as a bow tie, a pole as a circle with its material mark, lines with their service code in a break.

The blocks are our own drawings, not copies, and the library is not certified. The sizes are common precast and manufacturer sizes; pipe sizes, cover depths, separation distances, colour codes and structure details depend on your local authority and the utility owner, so use their standard drawings and check every part against the site survey.

Frequently asked questions

Can I use the blocks in a metre drawing?
Yes. The blocks are in millimetres, so insert them with a scale of 0.001 (INSERT with scale factor 0.001) or set the block unit conversion; a 1200 mm manhole then measures 1.2 units on a drawing in metres. In a drawing in millimetres they come in at 1:1.
Which structure sizes are included?
Storm, sanitary and combined manholes at 1050, 1200, 1500 and 1800 mm, water, telecom, electric and gas chambers, rectangular chambers from 900 x 900 to 2400 x 2400, drop, backdrop, shallow and terminal manholes, inspection chambers, wet wells of 2400 and 3000 mm, and valve vaults, plus inlets, headwalls for 450, 900 and 1200 pipes and box and pipe culverts.
Can I use the symbols in commercial projects?
Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty. Please do not redistribute or resell the library; see the library terms.
How do I show existing and abandoned lines?
Each utility has a new, an existing and (for storm, sanitary, water and gas) an abandoned line block. The existing line is drawn thin, the abandoned line is dashed and crossed, and the overhead lines are dashed with a dot at each end. The code in the break tells the service apart, so you can read the plan in black and white.
Can I change a symbol or add attributes?
Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.
Where do I find a ready-made set of these symbols for AutoCAD?
AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.