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<br />HEC-l INPUT DESCRIPTION <br />INPUT DATA STRUCTURE <br /> <br />1.2 INPUT DATA STRUCTURE (Continued) <br /> <br />Data input for RUNOFF calculations will be retained and used for <br />subsequent runoff calculations until new data are read. Thus the data <br />used in calculating runoff need only be read once, unless they are to be <br />changed for a new basin. A typical card sequence for computing subbasin <br />rainfall-runoff is: <br /> <br />( KK Hydrograph computation identification ) <br />( ) <br />( BA Basin area ) . <br />( ) <br />( BF* Base flow data ) <br />( ) <br />( P- Precipitation data ) <br />( ) <br />( L- Loss data ) <br />( ) <br />( U- Unit graph or kinematic wave data ) <br />( KK Hydrograph computation identification ) <br />( ) <br />( BA ) <br />( ) <br />( BF* If BF, P-, 1.-, U- cards ) <br />( ) <br />( P-* do not appear, data from ) <br />( ) <br />( L-* previous calculation will ) <br />( ) <br />( U-* be used. ) <br />( KK Etc. ) <br />( ) <br /> <br />. <br /> <br />*Optional cards <br /> <br />Continued <br /> <br />Page 4 <br />