आदितलस्य पञ्चभागाः शाला वापी सीमागृहं च ॥ कZ_०२.३.१९ ॥
āditalasya pañcabhāgāḥ śālā vāpī sīmāgṛhaṃ ca
The first/ground level (āditala) is to be divided into five parts, allocating spaces such as a hall (śālā), a water facility (vāpī), and a boundary/guard-house (sīmāgṛha).
Water access is a core civic necessity, while boundary/guard structures support administrative control, security, and regulated movement.