channel contractionchannel debris removalchannel degradationchannel densitychannel dredgedchannel expansionchannel improvementchannel irregularitychannel linechannel losschannel of large slopechannel of small slopechannel precipitationchannel re alignmentchannel resistancechannel roughnesschannel routingchannel runoffchannel springchannel stabilitychannel stabilizationchannel storagechannerychapeau basischaracteristic curvecharacteristic equationcharacteristic functioncharacteristic polynomialcharactristic linescharcochartchebotarvesquencechebyshev polynomialchebyshev systemcheck contourcheck damcheck ditchcheckboard schemechemical fallowchemical fertilizerchemical gagingchemical groutchemical sedimentchemical spillchemical weathering erosionchernozium soilschertychestnut soilschezy coefficientchezy formula