Water Order and Delivery Accounting
An irrigation district runs on orders: growers request water for a window, the district schedules it down the canal, and someone has to confirm that what was ordered is what actually arrived. Water order and delivery accounting is the loop that ties the request to the meter reading and the bill. This page explains how an order becomes a scheduled delivery, how the delivery is measured, and why ordered and delivered volumes so often differ.
Water Order and Delivery Accounting in one line: Water order and delivery accounting is the process of converting a grower's water order into a scheduled canal delivery, measuring what is actually delivered at the turnout, and reconciling the ordered volume against the delivered volume for billing. The order sets the plan, the turnout meter records the fact, and the reconciliation resolves the gap, so growers are billed for water they received rather than water they requested.
From Order to Scheduled Delivery
The cycle starts with an order: a grower requests a flow rate for a period, or a total volume, on a given lateral. The district aggregates orders along each canal and schedules gate and pump operations so the water arrives when promised, accounting for the hours it takes to travel down the system. On an automated canal this scheduling ties directly into canal pool level control, because the canal has to be brought to the right level to support the ordered turnout flows before the deliveries begin.
Scheduling is where the district's operating reality meets the growers' requests. Orders that exceed the canal's capacity, or that all land in the same window, force the district to stagger or curtail. The order system is therefore not just a form; it is the demand signal that drives how the district operates its canal gate automation for the day, and it is the baseline that the delivery is later measured against.
Measuring What Was Actually Delivered
The delivered volume comes from the turnout, using either a dedicated meter or a rated gate as covered in canal turnout flow measurement. SCADA integrates the turnout flow over the delivery window to produce the volume the grower actually received. This is the number that should drive the bill, because it reflects what left the canal and entered the service, not what the grower asked for or what the operator intended.
Continuous measurement matters here because deliveries rarely run at a flat rate for a clean interval. Canal levels move, a downstream restriction can throttle a turnout, and growers open and close on their own schedule. A totalized volume built from a continuous trend captures all of that, whereas a single spot reading multiplied by the ordered hours quietly assumes a delivery that never actually held steady.
Reconciling Ordered Against Delivered
Ordered and delivered volumes differ for honest reasons: the canal ran short, a turnout was throttled, a grower shut off early, or the schedule slipped. Reconciliation is the district's routine for resolving that gap into a billable number and a record of why. A delivery that consistently falls short of its order points at a canal or turnout problem the district should fix; one that consistently runs over points at a metering or control issue that is giving away water.
Trending both the ordered plan and the delivered actual side by side turns this into management information, not just billing. A district that sees a particular lateral chronically under-delivering against orders can act on it, and a grower who disputes a bill can be shown the delivery trend rather than argued with. The order sets expectation; the meter sets fact; the reconciliation, backed by a trend, is where the two are settled honestly.
Frequently Asked Questions
Why do ordered and delivered water volumes differ?
For several honest reasons: the canal ran short of capacity, a downstream restriction throttled the turnout, the grower shut off early or late, or the schedule slipped. The order is a plan and the delivery is a fact, so they rarely match exactly. Reconciliation resolves the gap into a billable volume and a recorded reason, and the pattern of the gap points at what to fix.
Should growers be billed on ordered or delivered volume?
On delivered volume, measured at the turnout and integrated over the delivery window, because that reflects the water the grower actually received. Billing on the order would charge growers for water the canal failed to deliver or overcharge when a turnout was throttled. The order sets the plan; the turnout meter sets the bill.
How does water ordering tie into canal automation?
The aggregated orders are the demand signal that drives canal operation for the day. The district has to bring each pool to the level that supports the ordered turnout flows before deliveries begin, so on an automated canal the order schedule feeds directly into the level and gate control. Ordering and canal control are two halves of the same operating cycle.
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