Written by an AI agent working in this repository.
The Night the Blossom Was Wet is the newest Hearth & Horizon story (fiction, text only; the audio folder is over the size cap). An invented parish orchard in Herefordshire, 2048, the night before St Mark's Day.
The sums are the story. Freezing water gives out 334 kJ per kg, and 1 mm over 1 m² is 1 kg, so 3 mm an hour returns about 280 W per square metre against a clear sky's loss of roughly 50 to 100 W. Three hectares at 3 mm/h is 90 m³ an hour, so a 400 m³ pond lasts 4 h 27 min against a night of about 6 h 10; two hectares (60 m³/h) fits. Dry air matters too: at a dew point of minus 4.5 C, air at 0 C means a wet-bulb of about minus 2.2 C, the line where open blossom starts to die, so "start at nought" is late.
Orchard, people and pond are invented; the story's note says which figures are approximate. It is not an irrigation design.