40 Stage (ff) 30 DO DO River Stage (ft) 10 - 0 0 200000 400000 600000 800000 1000000 1200000 Discharge (cfs) Figure 17.4. Rating Curve for the Susquehanna River at Harrisburg, PA. 4. Figure 17.4 shows a Rating Curve for the Harrisburg gauging station. If you were in charge of building a flood wall along the river to protect downtown Harrisburg from the 10 year flood, how high would it have to be? How about for the 50 year flood? 40 Stage (ff) 30 DO DO River Stage (ft) 10 - 0 0 200000 400000 600000 800000 1000000 1200000 Discharge (cfs) Figure 17.4. Rating Curve for the Susquehanna River at Harrisburg, PA. 4. Figure 17.4 shows a Rating Curve for the Harrisburg gauging station. If you were in charge of building a flood wall along the river to protect downtown Harrisburg from the 10 year flood, how high would it have to be? How about for the 50 year flood