Open Access
Table 1
Pressure parameters and levels for the calculation of the Combined Abiotic Pressure index (CAPi) (Birk et al., 2016 based on Pont et al., 2009).
| Parameter | Pressure level | |||
|---|---|---|---|---|
|
|
||||
| 1 | 2 | 3 | 4 | |
|
Damming
Influence of damming on the water body? |
No | – | Yes | – |
|
Influence of upstream dams
Flow regulation, temperature, sedimentation, reservoir flushing, and so on |
No | Slight | Strong | – |
|
Hydropeaking
Effects of hydropeaking; alteration of hydrograph |
No | Slight | Strong | – |
| Channelization | No | Slight | Significant | Strong |
| No: No channelization, no alteration of the “natural” cross section (no “hard works” affecting the whole river), no flow velocity increase | ||||
| Slight alteration: >10% of the segment affected by “hard works”, no flow velocity increase | ||||
| Significant alteration: A main part of the segment is affected by “hard works”, flow velocity increase | ||||
| Strong alteration: Straitened river, Technical-U-profile section, etc., flow velocity increase | ||||
|
Impoundment
Effects of impoundments; water velocity decrease |
No | Slight | Strong | – |
| Water abstraction | No | Slight | Significant | Strong |
| No: Sites not affected by water flow alteration | ||||
| Slight: Sites slightly affected (<10% of the median annual flow and the median monthly flow during a critical period) | ||||
| Significant: Sites significantly affected (>10% of median annual flow and median monthly flow during a critical period) | ||||
| Strong: Sites strongly affected (>50% of median annual flow and median monthly flow during a critical period) | ||||
| Riparian vegetation alteration | No | Slight | Strong | Complete |
| No: No direct alteration, i.e., adjacent natural vegetation appropriate to type and geography | ||||
| Slight: Slight alteration | ||||
| Strong: Strong alteration | ||||
| Complete: Anthropogenic complete loss of riparian vegetation | ||||
| Navigation intensity | No | Slight | Significant | Strong |
| Intensity of commercial traffic using large ships | ||||
| PO4-P (mg/L) | Min: 0.002 Max: 0.490 | |||
| NO3-N (mg/L) | Min: 0.05 Max: 4.88 | |||
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