EAM.4:4 - Solution
EAM.4:4.1 - Fix the service question and reuse an adequate answer
Identify the service result, recipients and relevant horizon. State the quantity and quality required, its timing and location, and the source and authority of any commitment. OPS.1 can supply the operating service and commitment account.
Separate an authorized requirement from a forecast of use. A known seasonal commitment can be compared directly with the applicable capability. Further forecasting is useful when the choice depends on a missing or uncertain demand premise. Keep a protected-service or peak requirement explicit even when average consumption is lower.
EAM.4:4.2 - Construct an applicable observation basis
Choose the boundary at which demand will be compared with asset contribution. For a water district, distinguish water delivered to users from water entering the district: distribution losses make the quantities different. For a transport service, trips requested, passengers carried and vehicle movements likewise need a stated relation.
Recover present use, unmet requests and committed future use. Establish whether the observations cover the relevant users, place, period and operating conditions. Rationing, failure or inaccessible capacity can suppress recorded delivery. Obtain the missing need estimate or retain that uncertainty; relabeling observed delivery does not recover it.
Separate components whose drivers or possible interventions differ. Household use, other use and losses may be useful for a water decision. Reconcile their sum with the total on the same boundary and interval. If they disagree, investigate the mismatch that could affect the choice. A residual between compatible inlet and customer measurements may estimate losses; an unexplained discrepancy between incompatible meters cannot be assigned that meaning.
Keep the observation and its limitations available alongside the component account. More detailed segmentation is useful when it changes an option or the needed forecast. It is unnecessary merely to make the account larger.
EAM.4:4.3 - Vary drivers and form coherent scenarios
For each material change, explain how it affects a component: more users, different use per user, a new industrial commitment, changed losses or a shared environmental condition. Apply that change to the appropriate base. For example, a 10% increase in household use changes the household component, not automatically the district’s losses and industrial use.
Combine component values that can obtain together. Several site maxima can occur at different hours; weather can also make formerly separate peaks coincide. Where timing matters, construct a common-period profile or obtain the applicable specialist account. Preserve location, service class and quality conditions that a total could conceal.
Form an unchanged-policy baseline before crediting a proposed demand-management measure. Describe a measure’s affected users, expected effect, delivery conditions and cost as an alternative for EAM.7. Use its reduction only in the scenario where those conditions hold. A proposed service reduction remains subject to the relevant authority.
Test the drivers that can change eligibility or preference. A justified range or a few explicit scenarios can be sufficient. If an option has 100 units of spare contribution, an uncertain additional demand spanning 90–170 leaves its adequacy unresolved; a range wholly above 100 establishes that this option cannot cover that demand range without another contribution. This threshold can identify a useful further inquiry. Give a scenario a probability only when evidence supports that interpretation.
A more elaborate forecast is needed when an important dependency, changing population or response to price, weather or restrictions cannot be supported by the simple account. Ask the specialist for the demand at the required boundary and periods, the relevant driver combinations, uncertainty and limitations. The receiving asset decision still compares the returned result under those conditions.
EAM.4:4.4 - Return the demand and the premise that could change it
Compare the constructed demand with the contribution being considered, including losses, coincidence, storage and operating conditions through applicable relationships. Return quantity, recipients, location, period, drivers and uncertainty conditions to EAM.6 and EAM.7. Keep the source of an authorized commitment distinguishable from the evidence for a forecast.
Stop when the account distinguishes the useful options or identifies a specific unresolved premise. Obtain further forecasting or measurement when its attainable answer can change the choice or warranted claim enough to justify its burden and delay. When an observation changes a relied-on driver, EAM.13 returns to this account and the affected capability or alternative; unchanged components can remain usable.