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<br />" <br /> <br />" <br /> <br />t'lr. Sirl Fox <br />^'HJUSI. 27, 1981 <br />IOage Four <br /> <br />roughness could be systematically documented In the <br />engineer's report. we believe the selection of "n" <br />values would become less of an issue. Base roughness is <br />" fucnLioll of pdrticlc' size, shclpe, dnd Spdctng. Some <br />of the mofiFying factors are listed below: <br /> <br />- De p tho f f low <br />- Vegetation <br />- Ob S t rue I ion S <br />- Channel irregularities <br />- Variations in cross section shape <br />- Channel s lope <br />- Sediment load <br />- l1eandering <br /> <br /> <br />We hope th is rev i ('W hdS -~ expla ined our concerns for the <br />floodplain study performed for ths project and that it will <br />povide some guidance for future floodplain studies. If there are <br />any points that need clarification, please do not hesitate to <br />call me at 866-3441. <br /> <br />Sincerely, <br /> <br />Will lam P. Stanton, P.E. <br />Acting Assistant Section Chief <br />Flood Control and Floodplain <br />Management Section <br /> <br />WPS/gI <br /> <br />cc: Mr. Larry Dezman <br />