GOZ015 - Wied tal-Grazzja


Wied tal-Grazzja is a valley with a single artificially constructed dam, located in central Gozo, within Rabat. The site is not accessible by the public as there are no passageways or footpaths available, however, the dam lake is visible from a nearby surfaced road. The site covers an approximate are of 3,850m2. Due to the site being predominantly surrounded by active agricultural land, it is likely the dam lake is being utilized for irrigation purposes. The site was dominated by Persicaria senegalensis, with Arundo donax, Ricinus communis, Typha domingensis, Galactites tomentosa and Tropaeolum majus L scattered around the basin. The site is not protected by any legislation.

Wetland data

Basic information
Wetland location: Inland
Wetland type: Artificial
Wetland area: 0.40 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 dam
Open water area (%): 51 - 75
Hydroperiod: Permanent
Geographic information
Census district: Gozo and Comino
Island: Gozo
Local council: Ir-Rabat, Ghawdex
Longitude: 14.245170 East
Latitude: 36.049740 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
Provisioning services Fresh water
Regulatory services Water regulation
Activities on wetland
Activity Intensity
020 = Resource conservation Low
130 = Irrigation High
502 = roads motorways High
701 = water pollution High
790 = Other pollution/human impacts/activities High
910 = Silting up Medium
952 = eutrophication High
954 = invasion by a species High
Activities on catchment area
Activity Intensity
100 = Cultivation High
110 = Use of pesticides High
120 = Fertilisation High
130 = Irrigation High
401 = continuous urbanisation Medium
430 = Agricultural structures Low
502 = roads motorways High
701 = water pollution High
790 = Other pollution/human impacts/activities High
Impact Intensity
EE- = Increase of economic potential Low
ER- = Increase in flow regulation High
ES- = Increase in water supply High
PF- = Fertilizer/Excess nutrient pollution High
PO- = Oil pollution High
PP- = Pesticide pollution Medium
PU- = Increase of turbidity High
Vegetation types
Type Coverage (%)
Emergent 51 - 75
Other 26 - 50
Wet meadow 26 - 50
Species Presence status References
Arundo donax
Galactites tomentosa
Persicaria senegalensis
Ricinus communis
Tropaeolum majus
Typha domingensis