Water Allocation Model
Overview
The water allocation model was developed by project partner
ARIJ. The demand
of a certain sector for water drives the model to allocate water with minimal
operational cost from the different sources available to that sector in order to
meet that demand. The model matches the overall spatial categories of the study
area with 3 neighboring countries (Palestine, Jordan and Israel), 3 “domains”
and 6 “water regions” with in the study area.
The main water supply for any region comes from its locally available water
sources, and supplementary water comes from other regions. If the supply of
water in the one region does not satisfy the demand, supplementary water will
come from the other regions in the study area. The model takes into
consideration the cost of water transportation from the one region to the other.
First, such transfers are given priority between regions of one country; if this
is not sufficient, there will be transfer of water from regions in other
countries.
Water
supply sources
- Drinking Water (Q1): represents total fresh water from groundwater
and surface water sources; it is usable for all the
demand sectors.
- Brackish Water (Q2, Q3): represents the total brackish water from
groundwater and surface water; it is of limited use
for agriculture; it can also be desalinated to become a source of supply to
the domestic, tourism and industrial sectors.
- Wastewater (WW2+WW3): represents the total wastewater generated from
domestic, tourist and industrial sectors.
Water demand sectors
- Domestic Sector: This includes also the
municipal/urban demand. The demand needs to be satisfied from drinking
water or/and desalinated other brackish water.
- Agricultural Sector: The demand in this sector should be satisfied
from the wastewater generated in the system at the local level, but also from
drinking water, brackish water, and treated wastewater. Brackish water is used
for limited agriculture, highly treated wastewater is used in the restricted
agriculture sector, and limited treated wastewater is used for inedible crops.
Drinking water and brackish water can be transferred from other regions to
meet the demand of this sector in the one region if shortage in water is
likely to occur in that region.
- Industrial Sector: The demand in this sector should be satisfied
from drinking water, brackish (regular or desalinated) water, and highly
treated wastewater (for certain industries). Water transfer is allowed from
other regions if local supply is not sufficient.
- Tourism Sector: The demand should be satisfied from the drinking
water and desalinated water. In case of regional shortage water is transferred
from other regions with water surplus.
Allocation assumptions
- The domestic demand
in each region is satisfied from the locally available water
resources. There will be no water imports or exports for domestic demand.
- Transfer of water from one region to the other is possible
only for
“productive” (agricultural, industrial and tourism) demand sectors.
- Each region consumes all
wastewater generated in the region.
There is no transfer of wastewater from one region to the other.
- Wastewater is
a priority water source for agriculture.
- Water import to any region includes the fresh surface, fresh ground,
brackish surface and brackish ground water
Allocation
priorities
- The first priority is given to the domestic sector. This is achieved through
restricting the allocation to this sector from local resources. Thus, the model
is obliged to satisfy the domestic demand from the local amounts at first.
- The second priority is given to the
highly productive tourism sector.
- The third and fourth priorities are given to
industrial and agricultural sectors. These sectors will also receive wastewater.
Programming
The “JOWA” model presented has been established using the GAMS linear
programming tools and MS Visual Basic. The MS Visual Basic was used to prepare
the input data of any specified scenario, to organize the data and to prepare
the GAMS script with the scenario input. The outputs from the GAMS tools are retrieved by
a Visual Basic program to present them in
a graphical user
interface.
Example results
Download options
- The model software is extensive (about 20 MB). It can be received through
contact with project partner ARIJ
-
ARIJ final report: Final Report on Water and Environmental Risk Modeling.
Activity 4.2: Water Allocation Model. Report to DG EC Research. Prepared by
Applied Research Institute Jerusalem (ARIJ), Bethlehem-Palestine, Dec 2000