Mayamatam 19.24

19.24

paṭṭikāntaṃ talaṃ pañcabhedaṃ sarveṣudhāmasu
chidraṃ vidyādadhaścordhvebāhye nālaṃ prayojayet

or terminating at the fillet—thus the level has five varieties in all edifices. / One should know that a drainage channel is to be provided below and above, on the outside.