Free
$0
forever, for learning and personal work
- Watermarked exports
- Results on screen
- Every export format
- Nothing to install
Read the land,
then grade it.
Bring terrain from a file, a location or your Rhino selection, see where water runs and ponds, put a design storm on it, and sculpt the ground with cut and fill volumes updating as you go.
Free to try, no account for the preview. First result under 3 min.
- Flow lines and ponding sites
- Storm balance: runoff, ponded, outflow
- Exports DXF, SVG, .3dm, GIS
Three readings, one terrain
Flow reads the land, Rainfall tests a storm, and Grading regrades it.
Where a storm ponds
The low points a storm fills, with the volume each one holds.
Earthworks as you sketch
Cut and fill volumes update live while you adjust levels.
Built in your browser
The terrain is read locally, and it can bake into Rhino.
Flow · Rainfall · Grading
Flow · Rainfall · Grading
One terrain, three questions.
Flow mode reads where water runs and collects across the site. Rainfall mode puts a design storm on it and balances what runs off, what ponds and what leaves. Grading mode lets you reshape the ground and re-runs everything live.
Read the legend for ridges and valleys, toggle contours and ponding sites on top, and set a storm depth and surface type to test. The plan leaves as a DXF or SVG drawing, the layers as GeoJSON or Shapefile for GIS, and the terrain back into Rhino.
Flow lines and ponding
Where water runs, and where it collects
A storm water balance
Runoff, ponded and outflow against each other
Live cut and fill
Earthworks measured while you grade
Plans
Free to design. Pro for client work.
Read and grade for free. Pay when the study goes to a client.
Pro
$29
per month, or $290 a year
- Clean exports, no watermark
- Downloadable PDF report
- 150 Advisor questions a month
- Clean exports, no watermark
- Cancel any time
Education
Free
with a verified academic email
- Watermarked exports
- Results on screen
- Renews yearly while you study
- Educational watermark
Limits shown are the live ones for this tool. Free and Education are for learning and personal exploration; client and commercial work needs Pro. See the terms. Want the method and its limits? Read the tutorial.
Export formats
Leaves as a working file
The plan and the layers leave for CAD and GIS, the terrain bakes back into Rhino, and a PDF report carries the reading to the meeting.
Try an export
DXF and SVG open in AutoCAD, Illustrator and Inkscape; GeoJSON and Shapefile in QGIS; .3dm in Rhino.
Rhino
The graded terrain as a .3dm, or baked straight into the open document.
- .3dm
- Bake
AutoCAD · Illustrator
A DXF plan or an SVG drawing with contours and flow lines.
- DXF
- SVG
Your terrain
QGIS · ArcGIS
Terrain and drainage layers for GIS.
- GeoJSON
- Shapefile
A spreadsheet · a report
The storm balance as CSV, or the reading as a PDF report.
- CSV
- PNG
FAQ
Common questions
Everything about data, formats and plans. Still curious? The tutorial goes deeper, and the Report button inside the tool reaches us.
What do I need to start?
It takes terrain from a .asc, .xyz, .obj or .3dm file, a location on the map, or your current Rhino selection, and the demo site needs no file at all.
What does it show me?
It reads where water runs and collects, puts a design storm on the site with a runoff, ponded and outflow balance, and lets you grade the ground with cut and fill volumes.
Which files can I export?
The result exports as DXF, SVG, PNG, GeoJSON, Shapefile, CSV and .3dm, plus a PDF report, and it can bake into the open Rhino document.
Is it a drainage design or a flood study?
No. It is a design-stage topographic reading with a storm water balance, not a hydraulic model, a pipe-sizing tool or a regulatory flood assessment.
Can I test a change in levels?
Yes. Grading mode re-runs the flow and storm readings on the edited terrain, so you can see whether a change moves a ponding problem or solves it.
Does my terrain leave my machine?
No. The terrain is read in your browser and can bake into Rhino on your machine.
See where the water goes on your site, where a storm ponds, then fix it with grading.