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title: "Channel Flow Inaccuracy Report"
canonical: "https://docs.rubiconwater.com/space/RptNC/1986953615/Channel%20Flow%20Inaccuracy%20Report"
format: markdown
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> Macro (toc)

# Report Description

The Channel Flow Inaccuracy report calculates the water balance for all regulators in the report area. It measures the efficiency of the channel by listing the absolute difference between total volume inflow and the outflow, and the percentage of the total inflow volume supplied for orders. You can filter the pools included in the report by pool efficiency, and by the gap between inflow and outflow.

This report is based on the <u>[Channel Section Efficiency Report](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1987281131)</u>, but with filters applied to the gap and the efficiency to highlight anomalies due to large losses or to measurement inaccuracies.

# Report Parameters and Options

| **Parameter** | **Description** |
| --- | --- |
| Area/Regulator | Select either an area, or a specific regulator.<br>- If you select an area, the report lists all the regulators in the area.
- If you select a regulator the report lists all regulators and pools downstream of the selected regulator. |
| Start/End Date | Choose a date range for the report. |
| Efficiency Threshold | This is a filter parameter to specify an efficiency threshold. Pools will be listed if their efficiency is less than:<br>100 - *efficiency threshold*<br>For example, if the efficiency threshold is 10, then only pools with an efficiency of less than 90% will be listed. |
| Gap Threshold | This is a filter parameter to show only pools for which the gap (the difference between inflow and outflow) is greater than the specified threshold. |

# Report Output

| **Field** | **Description** |
| --- | --- |
| Channel | Channel name |
| Pool's U/S Regulators | Upstream regulator (that is, the inflow regulator) for this pool |
| Type | Site type of upstream regulator |
| Inflow (ML) | Total volume of water that flowed into this pool for the period. This includes water supplied through the upstream regulator and any water flowing in from side channels. |
| Main Passing Flow (ML) | Total volume of water that flowed out of the pool through the next regulator downstream in the channel (that is, the next regulator that has the same channel attribute value as the regulator at the top of the pool.) |
| Spur Passing Flow (ML) | Total volume of water that flowed out of the pool through spur channels (that is through adjacent downstream regulators that have a different channel attribute value than the regulator at the top of the pool. |
| Outfalls (ML) | Total volume of water that flowed out of the pool through outfalls which are the most downstream regulators in a channel. Note that you can use the [Channel Section Listing Report ](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1987969025)to generate a list of outfalls downstream of any regulator. |
| Metered Deliveries (ML) | Volume delivered to outlets as measured by meter readings |
| Estimated Deliveries (ML) | Volume delivered to outlets without meter readings. This may be estimated in two ways:<br>- By estimating from order data.<br>- By calculating using measured flow tag data.<br>The estimate will be based on order data unless the outlet type is specified in the [https://rubiconwater.atlassian.net/wiki/spaces/CFGNC/pages/2002190435](https://rubiconwater.atlassian.net/wiki/spaces/CFGNC/pages/2002190435). |
| Total Deliveries (ML) | Sum of metered and estimated deliveries. |
| Gap (ML) | Difference between the total *Inflow* and the *Total Deliveries*.<br>*Inflow - Total Deliveries* |
| Pool Efficiency % | *Total Deliveries* as a percentage of the total *Inflow*.<br>*(Total Deliveries / Inflow) x 100* |
| Drown Count | Number of times that the drown alarm was triggered. |
| USL Discrepancy Count | Number of times that the upstream level discrepancy alarm was triggered. |

# How is the Outflow Volume Calculated?

The volume calculation depends on the type of regulator involved and what tags are configured for the regulator. The report uses the following tags in order of priority:

- If a **Current Group Volume for Season** (FLOW_GROUP_ACU_TOTAL) tag is available (this will only apply at a multigate SlipMeter site) then calculate the total volume for the period by subtracting the earliest event value from the latest value in the period.
- Otherwise if a **Volume Increments** (FLOW_ACU_SR_INC) tag exists then sum the tag events for the period.
- Otherwise if a **Current Volume for Season** (FLOW_ACU_TOTAL) tag exists, then calculate the total for the period by subtracting the earliest event value from the latest value in the period.
- If none of the above tags are available then integrate the **Current Flow** (FLOW_VAL) tag events within the period to calculate the volume.

# Related Reports

<u>[Channel Section Report](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1986888062)</u>

The Channel Section report calculates the water balance for all the pools in the report area but does not include uncertainty calculations.

<u>[Channel Section Efficiency Report](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1987281131)</u>

The Channel Section Efficiency report calculates the water balance for all pools in the report area including uncertainty calculations. It measures the pool by pool efficiency of the channel by listing the absolute difference between total volume inflow and outflow, and the percentage of the inflow volume supplied for orders.

<u>[Channel Section Listing Report](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1987969025)</u>

The Channel Section Listing report lists the details of all gates and meters in the report area, grouped by the pool in which the objects are located.

<u>[Monthly Efficiency Report](https://rubiconwater.atlassian.net/wiki/spaces/RptNC/pages/1987019308)</u>

The Monthly Efficiency report calculates the water balance and efficiency for the report area on a month by month basis. It incudes calculations of uncertainty.

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