The radar minima in this case is 2nm on the diagonal. 2.5nm is usually the lowest aimed for. The issue being that from 0620 onwards when departures begin, we need a minimum of 6nm gaps to the departure runway, which only works if you provide 6nm gaps to the other runway at the same time, due to the dependent approaches.
Thanks. Yes, I understand that two parallel offset landing streams at 6nm separation, with departures in the gaps, gives the same arrival rate as 3nm separation on a single runway.
And yet segregated ops can typically see 41 or more landings per hour compared to the 38 in the 0600-0700 hour, suggesting that there's more to it than simply theoretical capacity ?