Agriculture & Future Food Systems · Article

Food, water, energy and information flows

Track what physically moves alongside the orders, measurements and product records that guide those movements.

Preparation and related reading

Shared Foundations

This article helps you

Distinguish a product or resource quantity from a message about it.
Keep physical accounts on compatible units and boundaries.
Use information links without treating them as measurements of unobserved flows.

A request and a shipment are different events

A shop orders vegetables, and a grower sends a shipment. The order expresses a requested quantity and timing; the shipment contains material. They can differ without either record being meaningless. The order guides a decision, while receipt records what physically arrived.

Follow both channels. Material moves through production and handling; orders, prices, specifications and condition records inform choices. Information can arrive before the product, follow it later or be missing altogether.

Keep mass, water and energy distinct

Record a food's mass with its product and moisture basis. Water can enter as irrigation, washing water or an ingredient; the same litre can appear at different steps if reused. Electricity and other energy inputs need their own units and source.

Adding kilograms, litres and kilowatt-hours cannot create a meaningful total resource score. A ratio can answer a stated question, such as measured electricity per kilogram of an identified output. It does not replace separate material, water and energy accounts.

Throughput is not always a new input

Water circulating through a process can be counted each time it passes a point, while external input counts what enters across the boundary. Returned water and storage changes matter too. The water-system articles distinguish these terms and the conditions needed for suitable reuse.

Food inventory can similarly remain inside a facility across reporting periods. An order quantity, a dispatched quantity and a consumed quantity are different observations. Keep timing and inventory with the flows before interpreting a gap as loss or demand.

A message has a source and a purpose

A receiving operation may send quantity, quality and delivery requirements upstream. The supplier may send batch identity and relevant handling information downstream. These links help coordinate the physical journey but do not guarantee that the requirements were achieved.

A condition record should retain what was measured, when, where and by which method. A storage setting is information about equipment control; a product-temperature reading observes a product at a particular position and time. Confusing the two can hide what remains unknown.

Match meter readings with the output period

Choose an interval and boundary that match the account's purpose. Include the relevant meters and avoid counting the same electricity at both a site meter and its component meter. Keep stored material and work still in progress visible.

If a pump-only account omits cooling or upstream energy, label it accordingly. Similarly, an instruction to reduce water is not evidence that consumption fell. The shared conservation and uncertainty Foundations help separate arithmetic consistency from an adequately measured outcome.

Use differences to identify the next question

Compare ordered, dispatched and received quantities while keeping each record's role. Investigate disagreements through identities, measurements and operations rather than assuming a message physically created or removed food. The diagram isolates one invented order and shipment comparison.

Good information makes physical work more understandable and reviewable. It cannot substitute for the work or measurements themselves. Keeping channels separate and linked helps readers see both the resource requirements and the coordination needed for usable food.

Compare two distinct channels

Original hypothetical channels. The 20 kg gap is an unfulfilled request, not measured food loss or an inventory change.

Read the diagram as text

The invented 120 kg request is information; the stipulated 100 kg shipment is physical product received without transit loss.

Parts

Order: 120 kg requested: Information about desired quantity
Request received: A decision input, not physical inventory
Shipment: 100 kg: Physical product on the stated mass basis
Receipt: 100 kg: No transit loss stipulated; 20 kg request gap

Connections

Order: 120 kg requested → Request received: message
Shipment: 100 kg → Receipt: 100 kg: product

Worked examples

Locate the unfulfilled request

An invented order requests 120 kg of vegetables. Exactly 100 kg is dispatched and received, with no transit loss or other shipment. What difference does the record show?

Requested minus received amount is 120 − 100 = 20 kg.
Dispatch equals receipt, so the stipulated transfer has no transit mass loss.
The 20 kg is an unfulfilled requested amount, not 20 kg of food that was produced and then lost.

A 20 kg request gap; the given physical transfer remains 100 kg.

Define the energy intensity

For one invented completed 100 kg batch, separate nonoverlapping meters record 40 kWh in a handling process and 10 kWh in its cooling step. No other metered electricity is included. What ratio describes this boundary?

Included electricity is 40 + 10 = 50 kWh.
50 kWh / 100 kg = 0.50 kWh/kg.
The result excludes unmeasured equipment, upstream energy and other energy carriers; it is not total life-cycle demand.

0.50 kWh of included electricity per kilogram of the stated completed batch.

Check your understanding

Does receiving an order for food physically add that food to inventory?
Show answer and reasoning
No.
The message requests a flow; material receipt is a separate event.
Must every litre passing a recirculation meter be a new external input?
Show answer and reasoning
No.
The same water can pass repeatedly; the boundary distinguishes circulation from external supply.
Does a cooling setting alone measure product temperature?
Show answer and reasoning
No.
The command and the actual product observation describe different quantities.

Key ideas

Keep physical flows and information channels distinct but connected.
Record units, time, inventories and included meters.
Use messages to guide action and measurements to assess results.

References

Sources supporting the explanations and examples in this article.