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Good practice Imported

Ezousa Managed Aquifer Recharge — Treated-Effluent Recharge Against Seawater Intrusion (Paphos, Cyprus)

Cyprus · Paphos · See the Cyprus profile

Evidence: Observational / pre–post Top 76% 33/100 · Ask Evidence Copilot about this practice

Since 2004, Cyprus's Water Development Department has recharged 9,000-12,000 m3/day of tertiary-treated effluent from the Paphos plant into the Ezousa riverbed aquifer, storing irrigation water and slowing seawater intrusion - though intrusion is only partly controlled.

9,000-12,000 m3/day
Daily recharge volume (2004-present)
2-3 million m3/year
Annual recharge volume (2004-present)
4.2 million m3/year
Effective storage created (2004-present)
4 EUR million
Total investment (2004)
Ezousa Managed Aquifer Recharge — Treated-Effluent Recharge Against Seawater Intrusion (Paphos, Cyprus)

Details

Maturity
Established
Promoter
Water Development Department, Republic of Cyprus
Period
2004-present
Region (NUTS)
CY00
Keywords
water utilities, wastewater treatment, aquifer management, agriculture

Context

Cyprus is among the most water-scarce countries in the Mediterranean, and the Ezousa riverbed aquifer near Paphos lost much of its natural recharge after the Kannaviou dam was completed in 2005, which reduced upstream inflow and triggered seawater intrusion along the coastal aquifer.

Objectives

Since January 2004, Cyprus's Water Development Department has operated a managed aquifer recharge (MAR) scheme intended to restore aquifer storage and slow seawater intrusion by feeding tertiary-treated effluent from the Paphos wastewater treatment plant into infiltration ponds along the Ezousa riverbed.

Activities

The scheme recharges 9,000-12,000 m3/day (roughly 2-3 million m3/year), creating an estimated 4.2 million m3/year of effective storage, at a total investment of about EUR 4 million split between tertiary treatment and conveyance infrastructure (EUR 3.9 million) and the recharge ponds, boreholes and pumps (EUR 0.1 million).

Results

Independent monitoring found that total phosphorus is strongly absorbed and attenuated as it passes through the aquifer matrix, and that the scheme provides water for irrigation during the dry season, although nitrate attenuation is weaker.

Conclusions

Researchers note that the recharge only partially offsets the seawater intrusion caused by the loss of upstream flow and cannot fully substitute for natural recharge, though the scheme remains a documented part of Cyprus's broader wastewater reuse strategy.

Implementation
Indicative cost
Low (< €50k) — About EUR 4 million total: EUR 3.9 million for tertiary treatment and conveyance infrastructure, EUR 0.1 million for recharge ponds, boreholes and pumps.
Time to results
Long (> 3 years) — Operating continuously since January 2004.
Staffing & skills
Water Development Department (WDD) operations team

Conditions for success

  • Reliable tertiary treatment of effluent upstream of recharge
  • Sustained long-term monitoring of aquifer water quality

Common failure modes

  • Recharge alone cannot fully substitute for natural inflow lost to upstream dam construction
  • Nitrate attenuation is weaker than phosphorus attenuation, limiting water-quality benefit for some pollutants

Where it fits

Governance type
national water authority
Scale
single aquifer/river-basin
Income level
high-income

Commonly funded by

LIFE Programme National / regional programmes

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Data sources

Where this practice's information was retrieved from, and when.

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