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The changes in this beta will be available in the next Source production release due out at the end of June 2022.

This release includes:

• Additional functions for Data Sources and Probability Of Exceedance,
• improvements to constraints downstream of Storage nodes,
• Backwards Euler Release Method is now available for Weirs, and 
• changes for Plugin developers.

Functions for Data Sources and Probability Of Exceedance

There are four new built-in Functions:

• GetDataPeriod - Gets data from a Data Source between the start and end dates. Data is returned as an array.
• GetDataTimeSteps - Gets data from a Data Source using a start date and the number of time steps. Data is returned as an array.
• ProbabilityOfExceedanceFlow - Gets the percentage value for the given flow from the probability of exceedance curve.
• ProbabilityOfExceedancePercentage - Gets the flow value for the given percentage from the probability of exceedance curve.

Example usage:

//Data Sources functions

//Arguements are: Data Source (for files, Name.ColumnName), start year, start month, start day, end year, end month, end day
GetDataPeriod("MyDataSource_csv.Column1", 2000, 1, 1, 2020, 12, 31)
//Returns an array of values in the units of MyDataSource_csv.Column1.

//Arguements are: Data Source (For files, name and column name), start year, start month, start day, number of time steps
GetDataTimeSteps("MyDataSource_csv.Column1", 2000, 1, 1, 365)
//Returns an array of values in the units of MyDataSource_csv.Column1.

//These methods can then be used with other built in functions that take an array such as sum, median, average, min, max etc. e.g:
sum(GetDataTimeSteps("MyDataSource_csv.Column1", 2000, 1, 1, 365))

//Probability Of Exceedance

//Arguements are: Array of values, flow value (in the units of Flow_res_csv.Runoff)
ProbabilityOfExceedanceFlow(GetDataTimeSteps("Flow_res_csv.Runoff", 2000, 1, 1, 365),10)
//Returns the percentage value.

//Arguements are: Array of values, percentage
ProbabilityOfExceedancePercentage(GetDataTimeSteps("Flow_res_csv.Runoff", 2000, 1, 1, 365),20)
//Returns the flow value in the units of Flow_res_csv.Runoff.

//You can also use a modelled variable to provide the array of values
ProbabilityOfExceedanceFlow($Previous30DaysFlow,10)

Backwards Euler Release Method now available For Weirs

Backward Euler Method is now available for Weirs!   This wasn't a small development and requires testing from the jurisdictions. 

It's enabled under Edit \ Scenario options \ Storages:

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Storages have had the option of using the Backward Euler Method for a while now and it's the default for new models. However, the Piecewise-linear Integral Method is still available, see Storage Node - SRG for details. 

Moving the Weir over to the Backward Euler Method enables other features:

• Outlet Priorities can now be used,
• Weirs now include the concepts of a Safe Release capacity for Operating Constraints, and
• Ordering Priorities will now work with Weirs.

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Improvements to Minimum Constraints downstream of Storages

For Rules-based ordering, we have improved the Constraint calculations downstream of Storages. This is how the Constraint Phase in Storages was previously calculated:

1. The Storage Node Model calculates a Predicted Volume for the storage. This is done by taking the Current Storage Volume and adding the Ordering Minimum Constraint from upstream.
2. It uses this to determine a Minimum Release and a Maximum Release for each of the Outlet Paths, by comparing the Predicted Volume against the Outlet definitions (e.g. spillways, valves, etc)
   • There is a special case if the Predicted Volume exceeds the Full Supply Volume
   • In this case, the Minimum Release is the Predicted Volume - Dead Storage Volume - Full Supply Volume (which looks wrong: RM-17722)
3. The Minimum Release and a Maximum Release would become the Ordering Minimum Constraint and an Ordering Maximum Constraint for downstream.

We have now added a Volume Above Maximum Operating Constraints

• Volume Above Maximum Operating Constraints = Predicted Volume - Maximum Operating Constraint
• Then it is constrained so New Minimum Release = MIN( Maximum Release, MAX( Minimum Release, Volume Above Maximum Operating Constraints ) )

So that New Minimum Release becomes the Ordering Minimum Constraint.

Plugin Developers

The API for Custom functions has been extended:

• You can now include strings and arrays as arguments for custom functions.
• You can now return an array from a custom function, rather than just a single double value.

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• Environmental Flow Actions are now in the Feature Table,

Environmental Flow Actions are now in the Feature Table

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Plugin Developers

As we are moving to .net 6, we have now updated the .csproj format that is used by Source.  Please see: Csproj Format to go through the conversion process.

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• .Net Framework 4.8 Developer pack - https://dotnet.microsoft.com/en-us/download/dotnet-framework/thank-you/net48-developer-pack-offline-installer
• .NET 5.0 SDK - https://dotnet.microsoft.com/en-us/download/dotnet/5.0
• Visual Studio 2019 - https://visualstudio.microsoft.com/vs/older-downloads/

Regression Testing

There is no tolerance in our regression test suite to allow for earlier identification of results being different on different machines or versions of operating systems. 

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Details here: /wiki/spaces/SC/pages/51649764

Insight

To run Insight, you also need to install the 32bit version of Microsoft Visual C++ 2010 Redistributable Package.
This installer is for 32bit machines and 64bit machines since the library we use is 32bit: Microsoft Visual C++ 2010 Redistributable Package (x86).

Full Release Documentation

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