मत्स्यप्लवहरितपण्यानां सेतुषु राजा स्वाम्यं गच्छेत् ॥ कZ_०२.०१.२४ ॥
matsya-plava-harita-paṇyānāṃ setuṣu rājā svāmyaṃ gacchet
Over fish, ferries/boats (or floating operations), and green produce/vegetables associated with the setu-works, the king shall possess proprietary right (i.e., regulate and collect revenue).
Because irrigation works create/manage water-bodies that generate ancillary incomes; the state claims these rents to fund maintenance and assert regulatory control.