Mr Green was undertaking some cleaning on the right bank wall extension of the waterway, 5m upstream from the Leith footbridge, when he discovered the expectant bird.
''After consultation with Fish and Game and discovering it would take about 30 days for the eggs to hatch, it was decided that work on this section of the contract would be put on hold to allow nature to take its course,'' Mr Reid said.
Claudia took advantage of the reprieve and last week produced nine ducklings.
The family was last seen ''playing in the weirs downstream of the work site''.