Slope From the erosion control plan

Slope Length, Top to Toe m

Measured down the slope, not on the plan.

Slope Width across the Contour m

Row Spacing down the Slope m

The plan sets it; steeper slopes usually take rows closer together.

Wattle & Stakes From the product label and the plan

Length of One Wattle m

Overlap Where Wattles Meet cm

Stake Spacing along a Wattle m

Wattles to Order

— units

Rows times wattles per row

Take-Off

Rows down the Slope: — rows
Wattles per Row: — units
Total Wattle Length: — m
Stakes: — stakes
Slope Area: — m²
Wattle per 100 m² of Slope: — m

Row spacing, the overlap and the stake spacing are the plan's; erosion manuals set spacing by slope steepness and soil, and the tool has no figure of its own. Rows run across the full slope width on the contour, the first one row spacing below the top; a row at the toe is counted when the slope length is a whole number of spacings. Each wattle is staked along its length at the spacing given with one stake at each end; some plans stake through the overlap instead, which saves one stake a join. Trenching the wattle in is not counted. **This is a quantity take-off; where wattles belong on a slope is the plan's decision.**

Erosion Wattles & Fibre Rolls on a Slope: Rows, Units, Stakes & Total Length — free, with the formula and a worked example, at Textile School.