A-4.4% grade meets a 7.9% grade at a vertex (El. 136.35m) directly under an overpass bridge having underside elevation of 156.79m. A 7.8 meters clearance under the bridge and the center of the curve was observed. Determine the elevation of the invert on center when its location from PC is 91.6m. The pipe has an outside diameter of 0.7 meters and a thickness of 59.8mm. The backfill is 0.7 meters in depth. The bridge is having a width of 14.6 meters. Show solution and Plot.

A-4.4% grade meets a 7.9% grade at a vertex (El. 136.35m) directly under an overpass bridge having underside elevation of 156.79m. A 7.8 meters clearance under the bridge and the center of the curve was observed. Determine the elevation of the invert on center when its location from PC is 91.6m. The pipe has an outside diameter of 0.7 meters and a thickness of 59.8mm. The backfill is 0.7 meters in depth. The bridge is having a width of 14.6 meters. Show solution and Plot.