Key diagnostic quantities to quantify the leakiness of dust traps, here for the fiducial model of a disc with a 100 M_⊕ planet that has carved a gap at 10 au for a global viscosity α_visc = 10⁻³ and local turbulence δ_turb = 3.2 × 10⁻⁴. Upper panel: pebble flux F_peb outside the planetary gap (30 au, blue) and reaching the inner disc at 1 au (red), for a planet-hosting disc (solid line) or smooth disc (dashed line). Middle panel: total solid mass M_cross that has crossed the radial location r_gap = 10 au since t₀ as a function of time for a planet-hosting disc (solid line) and smooth disc (dashed line). The horizontal dotted line indicates the total solid mass initially located outside of 10 au. Lower panel: Trap blocking efficiency ℬ of the dust trap since t₀ as a function of time (see Eq. (4)).