A reservoir with a constant surface area of 21.6 km² has an elevation of 207.6 m above (mean sea level) at the beginning of the week. However the elevation measurement at the end of the week is missing. Meteorological measurements made at reservoir for the week indicate that the local precipitation accumulation was 101.6 mm and the total evaporation was 72.2 mm. Also, hydrological measurements made at reservoir indicate that the average river inflow rate is 34. m³/s, and the average outflow rate is 56.6 m³/s. Estimate the missing lake elevation at the end of the week.