http://agathe.gr/guide/southwest_fountain_house.html
Southwest Fountain House Closer to the agora proper a row of five public buildings lined the south side of the square in the Classical period (Fig. 29, 36). They comprise several important monuments, though ... Southwest Fountain House Closer to the agora proper a row of five public buildings lined the south side of the square in the Classical period (Fig. 29, 36). ... Low parapets set between columns allowed access to the water, delivered to the fountain by means of channels set within the thickness of the walls. ... Model of the Southwest Fountain House, one of the largest in Athens, ca. 350–325 B.C.