The subject of the verb ‘joins together’ (κολλᾷ) is ambiguous. It could be ‘he’ (Psaumis), continuing the construction from O.5.10—in parallel with ‘he sings’ (ἀείδει)—in order to emphasize Psaumis’ direct involvement in improving the navigation of the river Hipparis and facilitating the transport of building materials. Or it could be ‘it’ (Hipparis), the subject of the more immediately preceding relative clause at O.5.12 and in parallel with ‘waters’ (ἄρδει)—understanding the river as metaphorically building an area of sturdy dwellings by enabling the builders to rapidly float down wood and other construction elements for the new houses. In either case, the reference is an effective way of combining the local landscape features with their function in the life of the city and (explicitly or implicitly) with the involvement of Psaumis himself within the city.
Image via Wikimedia Commons.