You may have created a new calculated channel using the Manual Site Creation tool, or via F.A.C.E.: Configure Sites. Now, you must configure the channel with a F.A.C.E. calculation, that will be applied to all the data that is received by this channel. This topic provides general directions for configuring your calculated channel with either a F.A.C.E. function. F.A.C.E. has a host of predefined mathematical functions that can be applied to each individual row of data from the source channel. For example, you can use the Time-Weighted Average function to compute the daily average flow from a 5-minute flow channel.
This article assumes that you have already created a calculated channel and are now ready to set up the channel's calculation using F.A.C.E. If you don't already have a calculated channel established, you will need to first create one before proceeding further in this topic. You can make a new calculated channel in two ways: 1) Use Manual Site Creation to add a new site that has one or more calculated channels; 2) Add a calculated channel to an existing site via F.A.C.E.: Configure Sites page. Refer to the Add a raw or calculated data channel to an existing site documentation.
Before continuing on in this topic, please review the following articles.
The User Guide also discusses some particular scenarios for using formulas and functions. See the following topic for details, including step-by-step instructions for replicating the use-case.
1. Open F.A.C.E.: Configure Sites
- Click on Manage.
- A dropdown menu opens. Select Configure Sites (FACE).
2. View the Calculated Channel
- Use the Choose Site dropdown list to select the site that contains the calculated channel.
- Use the Choose Calculated Channel dropdown list to select the calculated channel you want to configure.
- Click View Calculated Channel.
3. Click Add Calculation
4. Add a Calculation Name and Description, and Choose a Function
- (Optional) Provide a Calculation Name and Description.
- Using the Type dropdown, select the calculation you wish to use.
Many of the available options are functions. Choose one that applies to you. In this example, Delta Time is chosen. Upon choosing any of the functions, the bottom section of the screen will update to reveal further setup options.
- (Optional) Set a Start Date and End Date.
This will apply the calculation only to data that falls within the given date range.
5. Set Up the Function
Setup options differ between each available function. The image below shows an example of setup for Delta Time.
6. (Optional) Configure Advanced Options
Advanced options are unavailable for some functions, including Delta Time.
7. (Optional) Add this Calculation to Other Sites
This list only contains sites that have a calculated channel with the same name, and all of the required source component channels. Take caution when applying this option to non-identical calculations to prevent unintended and inaccurate calculation results.
8. Click Save
You will be taken back to the View Calculated Channels page, where the new calculation will appear in a list.
Your new calculated channel is now ready for use. All incoming data from the source channels will be copied into this calculated channel, in which the function will be automatically applied to generate virtual (calculated) data. you can use this channel in the same ways as you can use raw channels, in any of FlowWorks' analysis, reporting and management tools.