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<br />!;TEP 10 (continued) <br /> <br />METHOD 1 . TABLE OF ESTIMATED FLOW VELOCITIES <br /> <br />Select the most representative description of the cross"section shape and note the <br />Hydraulic Radiu:; (R) <br /> <br />Select the representative Hydraulic Roughness (Manning's n Value) from the Table of <br />Hydraulic Roughness <br /> <br />Go to the table fa,: the appropJriate value of R <br /> <br />Determine whether the channel slope is Flail: (less than .002 foot per foot), Moderate <br />(between .002 foot per foot and .006 fool: per foot), or Stel~p (greater than ,006 foot per <br />foot) <br /> <br />Determine the approximate water velocity from the table <br /> <br />I Mannings n Valu;][ Flat ~oderate <br />.070 1.5 2,8 I <br />.050 2 4 I <br />,035 3 6 I <br /> I <br />,030 4 8 I <br />, <br />.014 8 16 I <br />, <br />I <br /> <br />Hydraulic Radius (R) = 3.3 <br /> <br />G~~ep <br /> <br />" <br />.' <br /> <br />7 <br /> <br />:.0 <br /> <br />14 <br /> <br />26 <br /> <br />Note: Velocttles are III teet per second <br /> <br />I Mannings n Valu~[ Flat [ Moderate <br />,070 1 2 <br /> .>-- <br />,050 1.4 2.8 <br /> -. J.- <br />.035 2 4 <br /> -- >-- <br />.030 2.5 5 <br />,014 5 10 <br /> <br />Hydraulic Radius (R) = 1.8 <br /> <br />r=::steep ] <br /> <br />3,5 <br /> <br />" <br />.J <br /> <br />7,5 <br /> <br />9 <br /> <br />18 <br />