Questions and answers

Questions and answers on Freshman


Projectnaam: FRESHMAN - Sustainable Freshwater Management in coastal zones
LIFE Programma: Climate action
Objective: to increase strategic freshwater reserve + new source for drinking water
What: demonstration project brackish water extraction in the dunes (NL) and a creek ridge (BE)
Where: PS Scheveningen (Dunea) and Avekapelle, Flanders (Watergroup)
Consortium: Dunea, Watergroep/Aquaduin, KWR, Allied waters
Subcontractors:  HWL, Deltares, Arcadis, grondboorbedrijf Haitjema en Logisticon water treatment
Coordinator: Dunea
Duration: July 2020 - December 2025
Project budget: 6.3 million euro
EU subsidy: 3.1 million euro (49%)

Questions and answers

How much water can be extracted in this way?

The Freshman project is based on a brackish water extraction of 50 m3/hour, which can produce 219,000 m3 of drinking water annually (with a net yield of 50%). Exploratory model calculations show that this source can meet a drinking water requirement of approximately 10 million m3/year in a full scale application, enough to meet the growing drinking water demand after 2025 until the year 2040.

Does Dunea have enough stock? When will the stock be insufficient?

Dunea relies on a strategic sweet groundwater supply in the dune to bridge intake stops. These can be caused by river pollution or technical failures in supply. Deep wells in the dune are currently used to exploit the underground freshwater supply in times of bridging, but many of these wells are salinous, thus not achieving the desired three-month bridging (in case of emergencies).

What techniques are used?

In the pilot we will gain operational experience with extraction and purification (desalination by reverse osmosis) of brackish groundwater, and with abstraction of groundwater in a changing brackish/sweet environment. The effects of withdrawal are portrayed by various monitoring wells. This way we gain a better understanding of the operation of the fresh/salt groundwater system on site, so that we can also better understand and model the larger concept of brackish water extraction.