They offer a simplified way to see the system without getting too lost in site specific data streams.
What makes for a good index well?
- Some are located plunk dab in the middle of the perfect spot;
- Others may aggregate data from a wide geographic area;
- Usually they come with a long historical record,
- And typically they are used for decision making.
Case in point is regulatory stage for the Water Conservation Area 3 portion of the Everglades. It’s computed by averaging three sites (Site 63, Site 64 and Site 65) into a single stage.
Area 3’s water depths are currently a foot deeper now than late March of last year. In terms of the annual cycle water, current stage is about a foot above the long-term low-water ebb in May and a foot below the long-term high-water crest in early October (based on the 20 year record).
As “midway” as that may seem,
For April it’s actually pretty high …
Or statistically-speaking, up in the 90th percentile.
1 comments:
Interesting...
We have a usual snowfall of over 85 to 95 inches and this year was extremely low, 75 inches. It really affects lake levels (Lake Michigan, etc.) so we all hope (though many dislike the snow!) for a goodly amount most winters now.
Our water levels have stayed, or fluctuated for the past few years but over all we have lost about 10 inches of lake water in the last decade.
This winter did not help the levels.
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