What were the merits and drawbacks of the ground compared to Castle Park? I assume the ground is drier?
That was the reason moving to the Garrison, but it wasn't a popular venue and - even given our poor start to the 1972 season* - the numbers attending games were well down compared to those attending the Park. Despite it's venerability to flooding and rain-sodden conditions, it was still preferred to the Garrison Ground by supporters.
*Ironically the last CC match there was also the first win of the season for Essex.