Appendix
ENVIRONMENT
UsDaysRain:
days/month with rainfall greater than 25 mm in the upstream catchment to
indicate the likely frequency of elevated flows;
UsAvgTNorm:
average air temperature (oC) in the upstream catchment, normalised with
respect to January air temperature;
UsAvgSlope:
average slope in the upstream catchment (o);
Calcium:
average calcium concentrations in surface rocks in upstream catchment;
Phosphorus:
average phosphorus concentrations available in surface rocks in
upstream catchment;
Hardness:
average hardness of underlying rocks in upstream catchment;
Peat:
proportion of catchment classed as peat;
Lake:
dimensionless index that accounts for volume of upstream lakes
Elevation:
elevation of downstream end of segment (m);
SegFlow:
mean annual flow (m3/sec), derived from hydrological models;
SegLowFlow:
mean annual 7-day low flow (m3/sec), derived from hydrological models;
LocHab:
weighted average of proportional cover of local habitat using categories
of: 1–still; 2–backwater; 3–pool; 4–run; 5–riffle; 6–rapid; 7–cascade,
predicted from a boosted regression tree model;
LocSed:
weighted average of proportional cover of bed sediment using categories
of: 1–mud; 2–sand; 3–fine gravel; 4–coarse gravel; 5–cobble; 6–boulder;
7–bedrock, predicted from a boosted regression tree model.
PRESSURE
Impervious:
proportional cover of anthropogenic impervious surfaces in upstream catchment;
NatCover:
proportional cover of natural vegetation cover in upstream catchment;
Pasture:
proportional cover of pasture in the upstream catchment;
LogN:
log10 nitrogen concentration (ppb) from upstream catchment based on a
regionally-based nitrogen leaching regression model implemented within a
catchment framework;
SegLogN:
log10 nitrogen concentration (ppb) from land adjacent to segment;
Upstream dams:number of upstream impoundments flow weighted to account for progressive
downstream dilution of regulation effects as flow increases with input from
undammed tributaries;
Mines:
number of upstream mines flow weighted to account for progressive downstream
dilution as flow increases with input from undammed tributaries;
Geothermal:
point discharges of human extracted geothermal water calculated as the number
of upstream point discharges flow weighted to account for their progressive
dilution downstream as flow increases with input from unaffected tributaries.