Priority

Demand Priority

The Demand Priority is the demand site's priority for supply, relative to all other demands in the system.  By default, priorities can range from 1 to 99, with 1 being the highest priority and 99 the lowest, although you can change the lowest priority in Basic Parameters. Priority can vary over time or by scenario.  See Demand Priority, Supply Preferences and Allocation Order for more information.

Note: if there is a transmission link carrying wastewater for reuse from one demand site to another demand site, the receiving demand site must have a lower priority than the supplying demand site. Otherwise, no water will be reused. This is due to the fact that demand sites with higher priorities are processed first by the WEAP allocation algorithm. Therefore, a higher priority receiving demand site would not receive any wastewater from the supplying demand site because the supplying demand site has not yet received any water nor returned any wastewater by the time the receiving demand site is processed.

Alternatively, you also have the option of setting the demand priority directly on the transmission link, instead of the demand priority on the demand site and the supply preference on the transmission link.  This could be useful if a demand site represents several demands which have different priorities.  To select this option, right click on the demand site or catchment, choose General Info, then check the box for "Priority on Transmission Link?".  In this case, you will not enter data for demand priority here, but on the transmission link.

Distribution Order

Optionally, if you want to be able to distribute differing amounts to branches within a demand site or catchment in case of shortage, you can set a distribution order for each branch.  The distribution order does not affect how much water gets allocated to each demand site and catchment, only how the demand site or catchment distributes its allocation internally to its sub-branches.  To set the distribution order, you must first turn on this option in Basic Parameters.

Enter data at any level of the Data Tree.  A value entered at one level will be used by all branches at lower levels, unless a value has also been entered at the lower level.  Leave all blank to distribute to all branches equally.  If coverage < 100%, WEAP will distribute water first to branches with distribution order 1, then second to order = 2, third to order 3, etc.  If multiple branches have the same order, they will get the same percentage of their demand met.  If the demand site as a whole has 100% coverage, then each branch will also have 100% coverage.  If the "Distribution Order" option has been turned on in Basic Parameters, three new reports will be available in the Results View, detailing how the water has been distributed within the demand sites: Supply Delivered by Branch, Unmet Demand by Branch, and Coverage by Branch.

Entered on: Data View, Branch: Demand Sites, Category: Priority, Tabs: Demand Priority, Distribution Order