The contract included creating a model for the quantitative and qualitative management of water resources from the North Kifisos River basin and the Iliki and Paralimni Lakes.
The management tool developed consisted of databases, simulation models of the composition of the surface and underground water, a water management model and a geographic information system (GIS). The system provides the following features:
a) Continuous updates of new parameters relating to the supply of or demand for water;
b) reliable estimates of available water resources under different hydrological conditions and for different levels of water demand, as well as the ability to quantify the level of uncertainty accompanying any estimate;
c) the ability of the system to cater to technical and administrative changes in order to evaluate the effects on the available water resources, an evaluation like this can take place in the following ways:
in quantitative terms (satisfaction or lack of demand by each user sector);
in qualitative terms (effects on the quality of the water);
in financial terms (in relation to beneficial costs of anticipated results).
The work was carried out in five stages:
This stage included:
a) collection and revision of existing studies;
b) collection of meteorological, climatological, geographical data and so on.
c) recording current hydrometeorological, hydrogeological and qualitative observations;
d) evaluating the information on all the hydrometeorological and hydrogeological data and the information on the quality of the water;
e) final selection of recorded factors.
This stage included:
a) analysis of the hydrometeorological and hydrogeological observations;
b) selection of hydrological, hydrogeological and administrative model as follows:
HYMOS 4.0 from Delft Hydraulics (database)
MODFLOW from USGS (simulation of underground flow)
SACRAMENTO from Delft Hydraulics (simulation of surface water drainage)
RIBASIM 6.21 from Delft Hydraulics (software management model).
The surface level and underground water resources, and all the water demand categories were represented by a network juncture of supply and demand.
In the model, all the existing and future infrastructure projects proposed were represented by appropriate junctions, which could either be active or not, depending on the situation at hand. By the same token, all water influx was also represented in the water resource system.
Finally, separate junctions were used to represent the water demand for collective irrigational projects and residential areas.
The model was fed with a time series of hydrological data from the HYMOS database and ensured that all the time series were synchronised, at least for a period of ten years, so that this period of time in the water resource system could be simulated in its entirety.
Calculation of the water balance using the model.
In this stage, the following factors were studied:
a) the present and future water needs of the Viotikos Kifisos River basin ;
b) the water supply needs of Athens ;
c) the environmental needs of the area;
d) the detailed recording of the existing projects.
e) all the projects proposed over time where studied and evaluated.
This stage consisted of two parts.
In the first part, using the management model referred to in Stage B, the area’s water resources were managed quantitatively and qualitatively.
The following scenarios were examined using the management model:
a) three hydrological conditions (moderate, dry and very dry);
b) three time horizons, the years 2000, 2010 and 2020;
c) linking climate conditions with consumption conditions;
d) conditions of artificially enhancing the underground hydrocarriers were also examined.
In the second part, completed proposals were made for an integrated irrigation department to manage all the projects.
a) Drawing up of an Instruction manual on how to use the model;
b) Training (300 hours of teaching seminars) of department personnel;
c) Follow-up and ensuring the smooth operation of the model.