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<br />insurance studies to evaluate flood plain encroachments and to <br />designate flood hazard zones. Also, capabilities are available <br />for assessing the effects of channel improvements and levees on <br />water surface profiles. <br /> <br />3.3.2 HEC-2 Program Inputs <br /> <br />The HEC-2 computer program requires channel cross sectional geo- <br />metries, Manning's 'n' values for frictional losses and the peak <br />flow values for routing through the channel. The four flood pro- <br />files calculated in this study were based on the following flood <br />flows: <br /> <br />FREQUENCY, YRS <br />10 <br />50 <br />100 <br />500 <br /> <br />SAN MIGUEL RIVER, BELOW <br />ATKINSON CREEK, CFS <br />13,580 <br />lZ,930 <br />14,930 <br />20,700 <br /> <br />SAN MIGUEL RIVER, ABOVE <br />ATKINSON CREEK, CFS <br /> <br />7,700 <br />11 ,700 <br />13 , 500 <br />18,700 <br /> <br />SAN MIGUEL RIVER, ABOVE <br />HIfROGLYPHIC CANYON, CFS <br /> <br />i' ,305 <br />11,165 <br />1,' ,880 <br />1 i' ,830 <br /> <br />10 <br />