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<br />B.5 <br /> <br /> <br />, <br /> <br />Turf~grasses where the average <br />depth of flow is about equal to <br />the height of vegetation, <br /> <br />Dormant season, willow or cotton- <br />wood trees 8 to 10 years old, inter- <br />grown with some weeds and brush, none <br />of the vegetation in fOliage, where <br />the hydraulic radius is greater <br />than 2 feet. <br /> <br />High <br /> <br />0,025 to 0.050 <br /> <br />Growing season, bushy.willows about <br />1 year old intergrown with some weeds <br />in full foliage along side slopes, no <br />significant vegetation along channel <br />bottom, where hydraulic radius is <br />greater than 2 feet, <br /> <br />Turf grasses where the average depth <br />of flow is less than one half the <br />height of vegetation, <br /> <br />Growing season, bushy willows about <br />1 year old, intergrown with weeds in <br />full foliage along side slopes; dense <br />growth of cattails along channel <br />bottom; any value of hydraulic radius <br />up to 10 or 15 feet. <br /> <br />Very high <br /> <br />0.050 to <br />0.100 <br /> <br />Growing season; trees intergrown <br />with weeds and brush, all in full <br />foliage; any value of hydraulic <br />radius up to 10 or 15 feet, <br /> <br />A further basis for judgment in the selection of the modifying <br />value for vegetation may be found in Table 1 which contains descrip- <br />tions and data for actual cases where n has been determined. In each <br />of the cases listed in Table 1 the data were such that the increase <br />in n due to vegetation could be determined within reasonably close <br />limi ts, <br /> <br />6th step, Determination of the modifying value for meandering <br />of channel. The modifying value for meandering may be estimated as <br />follows: Add the basic n for Step 1 and the modifying values of <br />Steps 2 through 5 to obtain the subtotal of ns' <br />