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Federal Act on the Protection of Waters (Waters Protection Act, WPA)
of 24 January 1991 (Status as of 1 February 2023)
Art. 31Minimum residual flow
1When withdrawal takes place from a permanently flowing watercourse, the minimum residual flow must be as follows:
up to a flow rate Q347of 60 l/s
50 l/s
and for each further 10 l/s of flow rate Q347
8 l/s
,
for aflow rate Q347of 160 l/s
130 l/s
and for each further 10 l/s of flow rate Q347
4.4 l/s
more,
for 500 l/s of flow rate Q347
280 l/s
and for each further 100 l/s offlow rate Q347
31 l/s
more,
for 2,500 l/sof flow rate Q347
900 l/s
and for each further 100 l/s of flow rate Q347
21.3 l/s
more,
for 10,000 l/s of flow rate Q347
2,500 l/s
and for each further 1000 l/s of flow rate Q347
150 l/s
more,
from 60,000 l/s of flow rate Q347
10,000 l/s
.
2The minimum residual flow calculated according to paragraph 1 above shall be increased if the following requirements are not complied with and cannot be complied with as a result of other measures:
a.
The prescribed water quality of the surface waters must be maintained in spite of the water withdrawal and existing waste water discharges.
b.
Groundwater resources must continue to be replenished such that the drinking water supply dependent on them remains available to the required extent and the water balance of soils used for agriculture is not substantially impaired.
c.
Rare habitats and biocoenoses which depend directly or indirectly on the type and size of a body of water must either be maintained or where possible be replaced by others of a similar value unless overriding reasons prevent this.
d.
The depth of water necessary for free fish migration must be maintained.
e.
In the case of watercourses with a flow rate Q347 of up to 40 litres per second below an altitude of 800 metres above sea level which serve as spawning grounds or habitats for juvenile fish, the continuation of these functions must be guaranteed.