GOZ020 - Wied tal-Altellier


Wied tal-Altellier is an artificial dam lake, located in eastern Gozo, between Xagħra and Nadur. The site is located in a rural location, however it is accessible through an unpaved road. The dam lake covers an approximate area of 7,040m2. The site is predominantly surrounded by agricultural land with elevated pipelines present within the basin of the site. It is likely that the water collected is being utilised for irrigation purposes. The perimeter of the site is surrounded by species including, Arundo Donax, Tamaric sp., Geranium mole, Foeniculum volgare and Opuntia ficus-indica. A large population of Lemna minor is also present within the damn lake. Within the dam lake, the alien frog, Pelophylax bedriagae is also present. The site falls within a No Trapping Zone under S.L. 504.71.

Wetland data

Basic information
Wetland location: Inland
Wetland type: Artificial
Wetland area: 0.70 Ha
Hydrological interaction: Yes 
Water salinity: Fresh (< 0.5 g/l)
Type of fresh water input: Catchment area (precipitation)
Surface water runoff Outflow controlled by pipeline
Open water area (%): > 95
Hydroperiod: Permanent
Geographic information
Census district: Gozo and Comino
Island: Gozo
Local council: In-Nadur
Longitude: 14.280230 East
Latitude: 36.044430 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
Ecosystem services
Type of ecosystem service Ecosystem service Scale of Βenefit (%) Importance
Regulatory services Flood hazard regulation
Provisioning services Food
Provisioning services Fresh water
Cultural services Recreation and tourism
Regulatory services Water purification
Regulatory services Water regulation
Activities on wetland
Activity Intensity
020 = Resource conservation High
130 = Irrigation High
701 = water pollution High
790 = Other pollution/human impacts/activities Low
952 = eutrophication Medium
954 = invasion by a species Low
Activities on catchment area
Activity Intensity
100 = Cultivation High
110 = Use of pesticides High
120 = Fertilisation High
130 = Irrigation High
230 = Hunting High
401 = continuous urbanisation Low
430 = Agricultural structures Low
501 = paths tracks cycling tracks Low
701 = water pollution High
790 = Other pollution/human impacts/activities Low
Impact Intensity
EB- = Increase in aesthetic qualities High
EE- = Increase of economic potential High
ER- = Increase in flow regulation High
ES- = Increase in water supply Low
PF- = Fertilizer/Excess nutrient pollution Medium
PO- = Oil pollution Low
PP- = Pesticide pollution
PU- = Increase of turbidity
Vegetation types
Type Coverage (%)
Emergent 76 - 95
Other 26 - 50
Floating-leaved 26 - 50
Shrubby / Arborescent < 5
Species Presence status References
Arundo donax
Foeniculum vulgare
Geranium molle
Lemna minor
Opuntia ficus-indica
Tamarix sp.


Presence status in wetland

Pelophylax bedriagae (Camerano, 1882)