- Wied is-Sewda

Wied Is-Sewda is a deep V-shaped watercourse which is cut in Lower and Middle Globigerina Limestone and discharges at il-Menqa in the Grand Harbour - the submerged extension of this valley. The site has been degraded for many years. Species noted during the survey included Ricinis communis, Arundo donax, Acacia sp., and Rumex conglomeratus. Agricultural land surrounds the area. A recent concrete road was built adjacent to the watercourse and dumping is reported frequently. Dumping of construction material was in fact witnessed during the site visit.

Wetland data

Basic information
Wetland location: Inland
Wetland type: Artificial
Wetland area: 2.50 Ha
Hydrological interaction: Yes 
Water salinity: Fresh (< 0.5 g/l)
Type of fresh water input: Catchment area (precipitation)
Surface water runoff Other
Open water area (%): 51 - 75
Hydroperiod: Seasonal
Geographic information
Census district: Western
Island: Malta
Local council: H'Attard
Longitude: 14.454160 East
Latitude: 35.884880 North
Biological significance
Biological significance: Low
Ramsar wetland type
Type Coverage (%)
6 -- Water storage areas; reservoirs/barrages/dams/impoundments (generally over 8 ha)
Property status
Activities on wetland
Activity Intensity
290 = Hunting fishing activities not referred to above Medium
502 = roads motorways High
852 = modifying structures of inland water courses High
920 = Drying out High
952 = eutrophication High
954 = invasion by a species High
967 = antagonism with domestic animals Medium
Activities on catchment area
Activity Intensity
100 = Cultivation High
110 = Use of pesticides
120 = Fertilisation
130 = Irrigation High
140 = Grazing
170 = Animal breeding
290 = Hunting fishing activities not referred to above
403 = dispersed habitation
430 = Agricultural structures
502 = roads motorways
Impact Intensity
AS- = Loss of scenic value Medium
FCD = Loss of faunal diversity High
HF- = Habitat fragmentation High
HL- = Habitat loss High
LW- = Decrease in wilderness/wildlife values High
PF- = Fertilizer/Excess nutrient pollution High
PP- = Pesticide pollution Medium
VCD = Loss of floral diversity
VCX = Introduction of exotic floral species
Vegetation types
Type Coverage (%)
Emergent 5 - 25
Shrubby / Arborescent
Species Presence status References
Acacia karoo
Acacia saligna
Arundo donax
Cyperus sp.
Eucalyptus sp.
Potentilla reptans
Ricinus communis
Rumex conglomeratus