Watershed Clearcut Percent Threshold Checker

Audit independently supplied nonoverlapping subcatchment clearcut inventories against caller thresholds and aggregate area, preserving local exceedances; no watershed routing or regulatory/hydrological safety certification.

Description

Watershed clearcut inventories can be summarized locally and across nonoverlapping subcatchments.

Watershed clearcut inventories can be summarized locally and across nonoverlapping subcatchments. An acceptable aggregate can still conceal a local threshold exceedance.^[1]

When to use Watershed Clearcut Percent Threshold Checker

Use this tool to audit independently supplied nonoverlapping subcatchment clearcut inventories against caller thresholds and aggregate area, preserving local exceedances; no watershed routing or regulatory/hydrological safety certification.

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.

How to use Watershed Clearcut Percent Threshold Checker and understand its results

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
Enter subcatchmentAreasHa, clearcutAreasHa, callerMaximumCutFractions using the field table and calculation rules, then run the tool.
Read subcatchmentClearcutFractions, aboveCallerThresholdFlags, wholeWatershedClearcutFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
subcatchmentAreasHa	Subcatchment areas ha	list of number	Required
clearcutAreasHa	Clearcut areas ha	list of number	Required
callerMaximumCutFractions	Caller maximum cut fractions	list of number	Required

Pair positive hectares, nonnegative cut hectares no greater than their subcatchment area and caller limits in [0,1]. Return local fractions, strict above-limit binary flags and the area-pooled watershed fraction.

Paired lists must be nonempty and have equal lengths.

local cut fraction=cut area/subcatchment area; pooled fraction=total cut area/total area

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
subcatchmentClearcutFractions	Subcatchment clearcut fractions	list of number
aboveCallerThresholdFlags	Above caller threshold flags	list of number
wholeWatershedClearcutFraction	Whole watershed clearcut fraction	number

json

{
  "input": {
    "subcatchmentAreasHa": [
      100,
      200
    ],
    "clearcutAreasHa": [
      10,
      80
    ],
    "callerMaximumCutFractions": [
      0.2,
      0.3
    ]
  },
  "output": {
    "subcatchmentClearcutFractions": [
      0.1,
      0.4
    ],
    "aboveCallerThresholdFlags": [
      0,
      1
    ],
    "wholeWatershedClearcutFraction": 0.3
  }
}

Limitations and assumptions

Inventories must not overlap. Routing, hydrologic response and regulatory compliance are not established.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Watershed Road Density km/km²: Aggregate nonoverlapping local road-length/area inventories and caller density exceedances, not simple averaging of unequal catchments; road locations and drainage connectivity are not inferred. For a complementary task, use Scarification Soil Disturbance Percent: Audit observed scarification point disturbance with physical representation weights and caller upper limit; no beneficial soil-preparation assumption or ecological/regulatory suitability certification.

References

Watershed Clearcut Percent Threshold Checker — tool.io

Similar or alternative tools

Watershed Road Density km/km²
Aggregate nonoverlapping local road-length/area inventories and caller density exceedances, not simple averaging of unequal catchments; road locations and drainage connectivity are not inferred.
Scarification Soil Disturbance Percent
Audit observed scarification point disturbance with physical representation weights and caller upper limit; no beneficial soil-preparation assumption or ecological/regulatory suitability certification.