Treated sewerage, with a density of 980 kg/m3 is discharged into seawater with a density of 1000 kg/m3 . the discharge pipe has a diameter of 30 cm and is flowing at 4 m/s. calculate the following, stating any assumptions made: (i) calculate the initial specific momentum flux and the initial specific buoyancy flux (ii) calculate lq and lm (iii) what is the length of the zone of flow establishment (zfe) (iv) calculate, clearly stating the assumed flow regime, the centre-line dilution at the following distances from the point of release: (a) 2m (1) (b) 4m (2) (c) 10m (2) (v) calculate the centre-line velocity at the following distances from the point of release: (a) 1 m (1) (b) 3 m