Kautilya's Arthashastra 2.36.22

2.36.22

rathyāsu kuṭavrajāḥ sahasraṃ tiṣṭheyuḥ, catuṣpathadvārarājaparigraheṣu ca //

Vessels filled with water shall be kept in thousands in a row without confusion not only in big streets and at places where four roads meet but also in front of the royal buildings (rajaprigraheshu).