त्रिभागाधिकायामा भाण्डवाहिनीः कुल्याः कारयेत् ॥ कZ_०२.३.३३ ॥
tribhāgādhikāyāmā bhāṇḍavāhinīḥ kulyāḥ kārayet
One should construct supply-carrying channels (kulyāḥ) with their length increased by one-third (tribhāga-adhika), suitable for transporting goods/materials (bhāṇḍa-vāhinīḥ).
They are not merely drainage; they are designed as logistics conduits for provisioning, construction materials, or protected internal movement.