Abstract
An alternative power function representation of hydraulic properties for one-dimensional flow routing in channels with compound cross-sections is put forward. The hydraulic properties of interest are cross-section flow area, wetted perimeter and conveyance factor. The independent variable is flow depth. The alternative power function representation is continuous with flow depth and it follows the trend of suddenly changing hydraulic property values at overbank elevation. It is applicable to a large range of complex section shapes which may include overbank channels, natural levees and minor channel irregularities such as sand bars and small terraces where traditional simple power functions have failed. The alternative power function representation is simple and highly efficient from the computational point of view. Its performance is illustrated for several actual compound cross-sections. Efficiency and extended capabilities make it an attractive procedure for one-dimensional channel flow routing in drainage networks where hydraulic properties of many cross-sections need repeated evaluation.
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