good question.

loss and expenses (LE) is a sensitive issue. will offend client no doubt

in order to claim loss and expenses, u have to demonstrate ur entitlement of EOT. to do that u need to have the original baseline (original master programme). then u have to revise the programme by incorporate ur entitlement of EOT inside. by do that ur baseline become baseline 2 (example). then u have to justify ur expenses but putting in the expenses into that period.

example:
1. original rent 5 month of tower crane, now 7 months, u get 2 months.
2. original u pay wages to ur stuff 7 months, now 5 months

bear in mind not all is straight away stuff.

there are few dalays,
culpable delay - contractor fault and therefore not entitle for LE nor EOT
concurrent delay - both contractor and employer contribute to the delay, hence EOT entitle LE not entitle
non culpable delay - employer/architect fault and contractor entitle both EOT and LE

different measure will be taken depend on how severe the water leaking are and what kind of exposure of the surface. normally, they will just do pressure grout injection at the water leaking zone with each point for injection is very close to each other in order to fill in the water capillary within the slab.