Here is some information about the work of Messrs Ockenden and Omer on Irish waterways up to 1759. It is extracted from a book by Henry Brooke; Ockenden had, twenty years earlier, subscribed to support Brooke’s play. It is not impossible that they were acquainted, in Ireland or in England. Apart from anything else, both were supporters of Frederick, Prince of Wales: see A N Newman “The Political Patronage of Frederick Lewis, Prince of Wales” in The Historical Journal Vol 1 No 1 1958 on Ockenden’s post in the prince’s household at £100 a year and here on Frederick’s “many attentions” to Brooke.
Brooke’s account contains some information about Ockenden’s work that I have not seen elsewhere. I found the reference to Brooke in Thomas McIlvenna This Wonder-Working Canal: a history of the Tyrone Navigation Coalisland Canal Branch IWAI 2005.