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La Tordera
(Catalonia, Spain)
1.
Location
Location of La Tordera
(circle) within Catalonia (square in inset)
Location of study
catchment and subcatchment within the La Tordera catchment. The
study subcatchment (red) is defined by the location of the
wastewater treatment plant, upstream and downstream of whose
effluent are the experimental reaches. The red and yellow lines
together define the catchment used in WP1 (defined by the location
of a discharge gauging station and a water chemistry monitoring
station). Finally, the black line defines the entire catchment of La
Tordera.
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2.
Descriptive data for study catchment
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Catchment area |
868.5 Km2 |
| Stream
length: |
61.5 Km |
| Climate: |
Mediterranean |
| Annual
rainfall: |
820 mm/year |
| Mean
annual discharge at river mouth: |
5.08 m3/s |
| Altitudinal
range headwater to river mouth: |
1100 m |
| Population |
103,000
inhabitants |
| Lithology: |
siliceous |
| Land
uses: |
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3.
Descriptive Data for Study Subcatchment
(catchment defined by WWTP)
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Catchment
area: |
80.4 km2 |
| Stream
length: |
21.7 |
| Annual
rainfall: |
550 mm/year |
| Mean
annual discharge before WWTP effluent: |
0.52 m3/s |
| Altitudinal
range from headwater to WWTP effluent: |
910 m |
| Population: |
7024 inhabitants |
| Distribution
of population: |
dispersed through
catchment and small towns |
| Lithology: |
siliceous |
| Land
uses: |
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4.
Wastewater Treatment Plant
Geographic
location:
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2º27'19" long, 41º41'34" lat |
Altitude:
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190 m a. s. l. |
Origin
of sewage inputs to WWTP:
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urban |
Equivalent
drained population:
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5 808 equivalent inhabitants/day |
Type
of nutrient treatment:
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none |
Treated
outflow discharge:
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0.015 m3/s |
Design
outflow discharge:
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NA |
COD:
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35 mg O2/L |
BOD:
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14 mg O2/L |
Suspended
solids:
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NA |
Conductivity:
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700 - 800 µS/cm |
N:
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10 mg/L |
| P: |
3 mg/L |
| Dissolved
oxygen: |
NA |
Wastewater treatment
plant at Santa Maria de Palautordera
5.
Descriptive data for experimental reach
(data
for the reference subreach, upstream of WWTP effluent)
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Morphology
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Water
chemistry
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Biological
communities
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Dominant
strata and species of riparian vegetation:
deciduous trees (Salix alba, Alnus
glutinosa, Platanus x-spanica, …) and
some shrubs (mostly Rubus ulmifolius)
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Dominant
aquatic primary producers: filamentous (Cladophora)
and encrusting algae (diatoms)
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Macroinvertebrates:
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PORIFERA
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SPONGILLIDAE
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CNIDARIA
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HYDRIDAE
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TURBELLARIA
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NEMATODA
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OLIGOCHAETA
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LUMBRICIDAE
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LUMBRICULIDAE
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NAIDIDAE
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TUBIFICIDAE
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HIRUDINEA
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ERPOBDELLIDAE
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GLOSSIPHONIIDAE
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GASTROPODA
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ANCYLIDAE
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HYDROBIIDAE
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LYMNAEIDAE
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PHYSIDAE
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CLADOCERA
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COPEPODA
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OSTRACODA
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AMPHIPODA
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GAMMARIDAE
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HYDRACNIDIA
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EPHEMEROPTERA
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BAETIDAE
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CAENIDAE
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EPHEMERELIDAE
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HEPTAGENIIDAE
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LEPTOPHLEBIIDAE
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PLECOPTERA
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LEUCTRIDAE
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TRICH0PTERA
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HYDROPTILIDAE
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HYDROPSYCHIDAE
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LEPIDOSTOMATIDAE
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LEPTOCERIDAE
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PSYCHOMYIIDAE
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POLYCENTROPODIDAE
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RHYACOPHILIDAE
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COLEOPTERA
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DYTISCIDAE
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HALIPLIDAE
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DIPTERA
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ANTHOMYIIDAE
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CERATOPOGONIDAE
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CHIRONOMIDA
E
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DIXIDAE
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EMPIDIDAE
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LIMONIDAE
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PSYCHODIDAE
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SIMULIIDAE
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TIPULIDAE
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Dominant
fishes: Squalius
cephalus,
Cyprinus carpio, Barbus meridionalis, Salmo
trutta and Anguilla sp
The Tordera
stream in winter, downstream the WWTP |
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