Laserfiche WebLink
<br />The inspection of hydraulic components is a key part of culvert inspection. <br />The condition of the stream channel should be visually inspected for the <br />following: <br /> <br />a. Horizontal alignment of the culvert with the stream channel--The <br />inspector should be aware that this may change during high or low flows and <br />that poor alignment may reduce the hydraulic capacity of the culvert. <br /> <br />b. Vertical alignment of the cu1vert--This may cause problems with <br />sedimentation or scour. <br /> <br />c. Erosion and scour--These may be related to vertical (steep gradient), <br />horizontal alignment, or to more frequent flows of higher magnitudes resulting <br />from changes in the watershed. <br /> <br />d. Accumulations of debris and sediment--These may be caused by a number of <br />factors including a culvert opening too small, installation of the culvert <br />with its invert below the streambed, obstructions downstream, or development <br />upstream. <br /> <br />Evaluation of the <br />inadequate opening. <br />for the following: <br /> <br />waterway adequacy involves checking for indications of an <br />The stream channel and drainage area should be evaluated <br /> <br />a. Changes in stream channel alignment which may reduce hydraulic capacity <br />or cause scour. <br /> <br />b. Changes in ground cover or land use which may affect the amount of <br />runoff the culvert must handle. <br /> <br />c. Changes in the amount and type of channel erosion. Excessive bank <br />erosion, stream channel aggradationldegradation, or head cutting may <br />indicate increased runoff. <br /> <br />d. Changes in high water marks. High water marks may indicate that <br />culverts are inadequately sized, increasing the potential for flooding <br />damage or roadway overtopping. <br /> <br />e. Changes in flow from intermittent to continuous which may indicate <br />changes in the drainage area. <br /> <br />f. Channel obstructions such as deposits of debris, mud slides, beaver <br />dams, fences, and utility pipes which may affect the hydraulic capacity <br />of culverts. <br /> <br />4-4.6 End Treatments <br /> <br />End treatments such as headwa11s, wingwa11s, slope protections, and energy <br />dissipators are used to protect the culvert barrel from hydraulic forces, <br />retain the embankment, and improve hydraulic efficiency. Headwall and <br />wingwa11 end treatments are shown in exhibit 42. The SI&A inspection form <br /> <br />66 <br />