The report refers to Actual Landing Distance; assuming this was as published in the Boeing QRH, then even with a 15% addition there was little or no margin for this landing. This also assumes that Boeing had data for a flooded runway, or that the crew knew of it, and understood the conditions at the airport.
The international TALPA meetings proposed new methods of assessing runway braking condition, which together with more realistic landing distances, Operational Landing Distance (OLD), particularly for contaminated runways, and the use of a minimum of 12% margin (FOLD), should reduce this type of accident - providing the crew think about the contributing factors and apply greater margins than the minimum.
EASA have mandated procedures associated with the TALPA changes; the FAA has not, relying on advice only.
Many manufacturers have published new landing data - FOLD, but as yet Boeing appears not to have done so for US / FAA operations. The FAA advice in this area is in AC 25-32, where para 11 considers existing aircraft; also see SAFO 19001 and 19003
Does Boeing publish any data according to the new OLD / FOLD requirements; are there any US operators using the new landing data, data supplied either by Boeing or other data suppliers; if so are the assumptions in calculation, for crew actions, and for safety margins explained?