Mathematics / Free printable PDF
Use a tabletop model or adult-supplied measurements. This is a mathematics exercise, not a drainage design.
Starting point: Ages 10+, with unit conversions and division
Format: Two-page, US Letter PDF. Print at 100% or fit to printable area.
A new sample template, with workspace and adult notes. Adapt the amount of work to the learner.
How to use this page
Use a tabletop model or adult-supplied measurements. This is a mathematics exercise, not a drainage design.
Do not measure in active work areas. An adult provides site measurements; actual construction needs appropriate expertise.