[14] As can be seen from the above passage, the benefit of the easement to the holder of the dominant tenement need not be continuous. The fact that the right is exercised only as an alternative in the event of a rare or perhaps even unlikely event may well be sufficient to make it sufficiently useful and valuable as to prevent its extinguishment under s. 181(1)(a) or (b). In the case of paragraph (b) the utility of the easement must be compared with the severity of the impedance.
[15] The evidence here does not establish that the continued existence of the easement impedes some reasonable user of Lot 2. I do not regard it as sufficient to point only to the location of the easement and submit that its mere existence necessarily constitutes an impedance. Mr Sheehan gave evidence that a sub-division of Lot 2 might be more valuable if the easement was extinguished, but there is no evidence Mr and Mrs Wallace want to subdivide or would be prevented by the easement from doing so. Lot 2 is a rural residential block. To found an extinguishment claim based on impedance, evidence of some practical use which is affected would be necessary.
[16] In any event, having regard to the possibility that the alternative direct access from the public road might on occasion be obstructed by flood water over the dam spillway and to the fact that Mr Goodwin in fact takes advantage of his right for morning exercise, I am not satisfied that a basis for extinguishment under s. 181(1)(b) has been made out.
[17] The principal argument advanced on behalf of the applicants was in relation to an alleged agreement to extinguish the easement. The alleged agreement is set out in the affidavit of Mr Wallace filed 4 December 2003 and the affidavit of Mrs Wallace filed on the same date. The agreement was said to have been made in late 1999 after Mr Goodwin telephoned Mr Wallace and asked if he could come and speak to him.
[18] In his affidavit Mr Wallace gives the conversation as follows:
"Mr Wallace: What's it all about Tony?
Mr Goodwin: Well I want to build some stables.
Mr Wallace: Where?