Design Blueprint: Handstation Tank

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24121333): This study examines a practical question in everyday hygiene by explicit arithmetic from stated assumptions. Daily demand was 259.0 litres, and with the reserve the required capacity was 297.8 litres, so the 25 litre container was selected and the 20 litre container rejected as 277.8 litres short. The 4 mm outlet delivered the target wash in 20 seconds at the stated head. One midday top-up of 10 litres, or 1 bucket trips, kept the level above the reserve line at every checkpoint in the simulated day, while a fill-once routine reached the reserve line at 13:10 and would have run dry before the Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.