Dr Mark Cooper, an expert in health and safety, also gave evidence on Friday.
During the hearing the jury was shown a map of the manholes along the culvert.
Pope and Cooper were both asked about their views in relation to fencing around the culvert.
Pope said that from his perspective nearby fencing in Linear Park “would prevent unauthorised access from the majority of the public, but wouldn’t exclude it completely”.
Cooper said that when it came to the fencing he “felt very strongly” and that it was “a mixed picture”.
He told the inquest anybody who had access to the properties could, in turn, get to the gardens – where there isn’t fencing.
Cooper also told the hearing that being in a confined space affects people in different ways.
“Some are very able and some you wouldn’t want them to do it – as they are claustrophobic – it’s person dependent.”