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<br /> <br />" , <br />. ' <br />.,.j~. <br /> <br />Exhibit 15. Roadway overtopping due to culverts with <br />inadequate capacity may result in extensive <br />damage to the roadway and the embankment. <br /> <br />3-2.1 Estimating Runoff. <br /> <br />Most culverts are designed to carry the surface runoff from a specific <br />drainage area, as illustrated in exhibit 16. While the selection and use of <br />appropriate methods of estimating runoff requires a person experienced in <br />hydrologic analysis and would usually not be performed by the inspector, the <br />inspector should understand how changes in the topography of the drainage area <br />can cause major changes in runoff. Climatic and topographic factors are <br />briefly discussed in the following sections. <br /> <br />26 <br />