Can anyone recommend a good supplier/source of liquid fluorescein dye (or perhaps pwder if that is the preferred format these days? There's a lot of stuff online, but much of it looks like 'drain tester' stuff which I doubt is the real mccoy.

!WARNING! Erosion of the stream bank just downstream of the entrance to Aygill Caverns (near Bull Pot Farm) has drastically altered the local hydrology of Aygill, with serious consequences for access to the cave. The gill has been steadily eating away at the bank for several years now, but...

Just so you know..... A midweek trip into Aygill revealed the absence of the fixed rope on the first pitch, often known as the Traverse Pitch. The fixed rope allowed you to 'traverse' the pitch with just cowstails to protect a step across onto a ledge and boulder, from where there was an easy...

Whilst browsing a geography site for some other info, I noticed an interesting blog entry (on the same site) about a long river cave on the island of Palawan in the Philippines: http://basementgeographer.com/puerto-princesa-subterranean-river/ The basic facts, of a 24km long cave system with...

Anyone know how to get the contacts strip out of the bottom of the Duo battery case?  My cable's worn quite close to the exit port from the battery case and I could do with replacing it...but the contacts strip will have to come out. Are they know to be 'releasable'?...or will brute force and...

Anyone visiting Aygill Caverns should be aware that the tube crawl from the bottom of the Traverse Pitch (or 1st pitch) to the 2nd pitch now carries substantially more water than it used to and may flood in wet conditions. We have been working in Aygill on and off for several years and have...

Maybe not very scientific, but what is the current best method for measuring flow rates of streams? I want to measure amount of water going in sinks and coming out of risings...see if they all add up! Stream beds are a series of variable width/depth pools and falls, and I can't see any accurate...