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<br />The performance curves in Figure 8 illustrate <br />geometry affects the capacity of a given culvert. <br />use of performance curves to compare the operation <br />of various sizes and entrance configurations for a <br />charge are discussed in detail in Sections III and <br /> <br />how inlet <br />The practical <br />of culverts <br />given dis- <br />IV. <br /> <br />e <br /> <br />In improved inlet design, the inverts of the face sections <br />for the different types of improved inlets fall at various locations, <br />depending on the design chosen. Therefore, it is difficult to define <br />a datum point for use in comparing the performance of a series of <br />improved inlet designs. The use of elevations is suggested, and <br />this concept is used in the design procedure of this Circular. <br />The example problem performance curves are plots of discharge <br />versus required headwater elevations. Allowable headwater is :' <br />also expressed as an elevation. <br /> <br />e <br /> <br />~ <br /> <br />, <br />~ <br /> <br />e <br /> <br />13-18 <br />