चतुरशीत्यङ्गुलो व्यामो रज्जुमानं खातपौरुषं च ॥ कZ_०२.२०.१७ ॥
caturaśītyaṅgulo vyāmo rajjumānaṃ khātapauruṣaṃ ca
A vyāma is eighty-four aṅgulas; it is the rope-measure (rajju-māna) and is also used as the ‘excavation-man’ (khāta-pauruṣa) standard.
Rope standards enable repeatable site checks; officials cannot easily inflate excavation lengths/depths to overbill the treasury.