Bouncing the polytunnel

Did I mention that we had a dump of snow last weekend? I did, in passing. It's true that fallen snow is, like ice-cream, mostly air - let's say it has a density of 10% of liquid/solid water. But that can still be a lorra weight it spread out across a large structure. An under-engineered flat roofed sports complex in Tralee collapsed at 06:00hrs during the recent orange snow and ice warning for the South of Ireland [Galway to Dublin downwards, not the 26 counties]. I'm sure the structural specs took data on 100 year snow events, adding 50% for safety, to determine the size of the trusses. It's a roof: you don't want to over-engineer it because you then have to up-spec the walls to carry the additional weight. There will be an enquiry, everyone will lawyer up, nobody will lose their jobs or be sanctioned. Not least because the structure was opened in 1977, so most of those responsible are dead in the 80s or older.

We have a relatable situation in the polytunnel which has a 9m x 17m = 150 sq.m. footprint, with say half of it sort of horizontal. Well. flat enough to hold snow as it falls. On the night 04/05 Jan, we got 9cm of snow. Which is about 10mm of rain equivalent, except that it stayed on the polytunnel roof rather than running away. That's less than a tonne [75sq.m x 10mm = 750kg] of extra weight up there but it l👁👁ked a lot more under the bulging plastic. That 's polythene, which ripped asunder at the height of  the Darwinday Storm of 2014 but is generally good for plastic deformation. We have a convenient length of 50mm ⌀ plastic pipe that can reach all areas on the inside of the plastic, so I put a robust rubber glove on the end of the pipe and, starting at the bottom, bounced some of the snow off the roof. Gotta get the rhythm, bro. Over the next tuthree days, I bounced a little more; until almost all the extra weight was on the ground. No Tralee here . . . this time

You can see the effect in the picture for 2 of the eight bays of the tunnel: a gurt hape of heavy snow on the ground and a clean-ish track on the plastic where the snow has scoured off the algae. You can also see one end of the 2014 Darwinday rip covered with fresh white Fablon® since the 2022 refurb by Rene and Kamil.

We hazarded leaving the sheep [N = 15] in the 0.4 ha field adjacent to the tunnel and they've been getting a breakfast of sheep muesli and some rather tasty-smelling hay which we've had in reserve for the last few years [hey, thanks Syl!]. The sheep seem to be doing okay on such short commons.