2012-04-01 // Flow Trends Now Functional
I am very excited about this. Due to the changes in how river gauges are reporting we can now collate that data and analyze it easily. Right now I am calling this feature “experimental” because over the course of the season I may need to play with it a bit to get the math just right. More on this later. You will also notice that right now there is small black “War” text in many of the boxes. This is because those rivers are currently not reporting a flow and causing the code I wrote to fail. This will disappear once they begin reporting flow.
So where did this come from? As an avid paddled one of the things I am always curious about is whether a river is rising, dropping or remaining stable. Am I going to drive out to S-Bends on the Red Deer for the weekend to find the water level drops too low or is it going to flood out? So consequently PaddlingABC is now analyzing the past 36 hours of recorded flows to see how the flow is changing and reporting this to you. Here is what it may look like:
In this example the Sheep River is showing a horizontal bar to represent that the river flow has been stable over the last 36 hours. The other symbols you will see are the following:
I think they are pretty self explanatory. A single up or down arrow means that the river level is rising/dropping and two arrows mean that it is rising/dropping quickly. Read more for some mathematical details!
Right now I am using the following percentage point cutoffs. I will possibly tweak these throughout the season:
| Percentage Change | Result |
|---|---|
| Over +12% |  |
| +6% to +12% |  |
| +/-6% |  |
| -6% to -12% |  |
| Below -12% |  |
So there you have it! The flow trends are functional right now. Let me know if you have thoughts, ideas or feedback.
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