It's a good job that the Great Orme was made up of porous Limestone as a lot of the water was absorbed by the Copper mines and cavern systems on it or otherwise the situation in Llandudno could have been a lot worse
In addition to the Marine Drive water came down the Great Orme at an alarming rate and went down Old Road straight in to the town centre as this old video depicts
I was interested to read this article in the report
"Before then, West Shore was vulnerable to the kind of incursions now being envisaged in the future. “In the 1920s the area used to flood quite frequently,” said one resident online. “I remember my mother saying that the water travelled down Gloddaeth Avenue and nearly met with flood water from the North Shore.”
If I'm not mistaken, that quote was mine and taken from the Three Towns Forum
Yes, the West Shore did get flooded in those days and that's because the sea defence there wasn't built until about 1952. In the following 70 years the sea wall was never breached. Not by water anyway but by sand after the "experts" constructed a second sea defence in 1993 and that caused catastrophic damage to the West Shore by the wind blown sand
That proposed increase in height of the sea defence by 300mm ( 12 inches to an old duffer like me ) seems like a joke but perhaps the marine experts in CCBC will be third time lucky and get it right
https://www.youtube.com/watch?v=zlIJ3vmlcP4