Catchment water quality process manage and deal with constituents that affect water quality.
These processes are comprised of constituent generation and constituent filtering models.
Constituent generation models
The modeller can choose from the following constituent generation models available in Source:
- Nil constituent
- EMC/DWC
- Export rate
- Power function
- Simple groundwater salt model
Constituent filter models
These constituent filters are available in Source:
- Pass-through
- Percent removal
- Riparian Particular Model of Riparian buffers (RPM)
- 1st order Kinteric model (k-C)
- Load-based nutrient delivery ratio
- Load-based sediment delivery ratio
- Farm dams
processes modelled in Source are:
The constituent generation models operate at various scales: some are applicable at the functional unit scale and others at sub-catchment and catchment scales. Some can be used to derive time series of constituent exports while others are only suitable for estimating statistics such as long term averages. Most of them are generic in that they can be used to model any constituent. See the Constituent Generation - SRG section for further information.
The constituent filters provide a variety of techniques for modelling the modification of constituent concentrations or loads, depending on the technique chosen by the user. Some of the techniques are suitable for use in scaling up outputs from one scale to another (e.g. converting exports from functional units to deliveries to streams). See the Constituent Filters - SRG section for further information.