Rainwater Earthwork Catchment Depth Factor Tool

Description

For nonnegative areaM2 and depthMm and captureFraction in [0,1] return capturedLiters=areaM2*depthMm*captureFraction.

Garden and resource-design calculations combine measured lengths, areas, water volumes, material fractions, travel, and evidence records. A useful budget needs consistent units and clear overlap, exclusion, and denominator rules. Supplied geometry and efficiencies describe a model rather than verified site performance.

For nonnegative areaM2 and depthMm and captureFraction in [0,1] return capturedLiters=areaM2*depthMm*captureFraction.

When to use this tool

Use Rainwater Earthwork Catchment Depth Factor when you have supplied site dimensions or resource records and need the stated geometry, budget, or coverage measure.

How to use the tool and how it works

Enter areaM2, depthMm, captureFraction. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read capturedLiters. Use the output convention below.

For nonnegative areaM2 and depthMm and captureFraction in [0,1] return capturedLiters=areaM2*depthMm*captureFraction.^[1]

Input field	Meaning and units	Accepted input
areaM2	Area M2	Required. Finite number; minimum 0.
depthMm	Depth Mm	Required. Finite number; minimum 0.
captureFraction	Capture Fraction	Required. Finite number; minimum 0; maximum 1.

Output field	Interpretation	Returned shape
capturedLiters	Modeled captured volume in liters for m^2 area and mm rain depth.	Required. Finite number.

json

{
  "input": {
    "areaM2": 100,
    "depthMm": 10,
    "captureFraction": 0.8
  },
  "output": {
    "capturedLiters": 800
  }
}

Limitations and assumptions

One millimeter over one square meter is one liter. Capture fraction is supplied; actual runoff, collection losses, storage limits, water quality, and flood risks require separate assessment.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.

Alternative or Complementary methods

Use verified site measurements and suitable physical or resource models for a complete design. Check units, overlap, losses, capacity, and whether an accounting share represents the intended quantity.

References

Calculation and input contract: permaculture/rainwater-earthwork-catchment-depth-factor — tool.io

Similar or alternative tools

Catchment Storage Remaining Volume
For nonnegative capacity, stored, and reserved return remaining=capacity-stored-reserved and available=max(0,remaining).
Mulch Cover Depth Factor
For nonnegative coveredArea and depth and coverageFraction in [0,1] return volume=coveredArea*depth*coverageFraction.