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
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  –
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        
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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