We are considering a water drive gas reservoir where the bulk volume invaded by water at pf (3325 psia) is 47.3 mm ft^3. the following data are also available: Wp=25,600 STB, Pi=3600psia, Swi=.27, Bgf=.0057 ft^3/scf, Porosity=.19, Gp=1.735 mmm scf, Pf=3325 psia, Bgi=.005262 ft^3/scf, Bw=1.04 bbl/stb. Calculate us the water influx and Sgr, the residual gas saturation.