'Annual competition for the longest new discovery under Mendip or Scotland between Nov 1st 2022 and Oct 31st 2023'
mikem said:Although helpful, levels will invariably have changed by the time you get there - you also want to know whether it's rising or dropping!
A couple of years ago there was a thread where using an underground stream to produce electricity via a water wheel and generator was mentioned (I think it involved recharging a battery that would be used to power a ventilation fan).PeteHall said:Would it be incredibly far-fetched to have a monitoring station underground, (perhaps charged by a water driven turbine?), with a cave-link type communication to a weather station on the surface?
You could potentially see live(ish) data for the cave online before planning your trip
Given normal variations in atmospheric pressure can equate to 0.3m of water, it is difficult to make something waterproof. Tony's detector uses O rings. So you may wish to install a bag of silica gel to absorb any moisture which gets inside plus apply a conformal coat to your electronics to minimise the impact of moisture. My kit lasted two weeks before what I presume was moisture killed it. So plan on returning frequently to check thingsblhall195 said:It uses a waterproof ultra sonic distance measuring sensor ... as the prototype isn't completely waterproof (IP67).
TheBitterEnd said:I asked the met office if they made historic rainfall radar data available but they don't and apparently they don't even record it. I did wonder if it would be possible to screen-scrape the rainfall radar map but never got around to trying.
blhall195 said:Ideally I'd put it on a bridge somewhere that already has a monitoring sensor to check it's working properly before leaving it in a cave.
I'd just need to work out how to secure it to the bridge in a way that's discreate enough for people not to care it's there, maybe alongside the existing river level monitoring equipment.
mikem said:I think the API includes rainfall records from weather stations, rather than radar data, which could be interpolated for sites in-between.
mikem said:Tim Pickering - showcaves being normally resurgences, their water is often collected from a very wide area, where differing rainfall over the catchment may result in variations in observed levels & timings. Some of that water will come directly through large conduits, so providing rapid & often muddy influxes, others through tiny passages, some may cause flooded chambers to overspill, thus forcing cleaner water through the system & sometimes that overflow may be overwhelmed (or become blocked) & rise to another passage that takes it off in a different direction (plus all the variables in ground / saturation conditions mentioned already)...
Yes it is available for next 36 hours, but TheBitterEnd was asking about historical data to compare to past events.aricooperdavis said:I could be wrong as I haven't actually tried the radar service yet, but there is documentation for how to fetch rainfall radar tiles using datapoint on the Met Office website, so unless this is no longer or not yet supported it should be doable?
aricooperdavis said:mikem said:I think the API includes rainfall records from weather stations, rather than radar data, which could be interpolated for sites in-between.
I could be wrong as I haven't actually tried the radar service yet, but there is documentation for how to fetch rainfall radar tiles using datapoint on the Met Office website, so unless this is no longer or not yet supported it should be doable?