Laserfiche WebLink
<br />discharge, date of design policy, flow conditions, limits of flood plain, type <br />of energy dissipators, cut of wall depth, channel alignment, and channel <br />protection. <br /> <br />b. Repair History--Information on repairs, culvert extensions, and <br />rehabilitation activities should be collected. The types and amount of <br />repairs performed at a culvert site can be extremely important. Frequent <br />roadway patching due to recurring settlement over a culvert may indicate <br />serious problems that are not readily apparent through inspection of the <br />culvert barrel itself. <br /> <br />c. Inspection History--Data from previous inspections can be particularly <br />useful in identifying components that require special attention during an <br />inspection. Information from earlier inspections can be compared against <br />current conditions to estimate rates of deterioration and to help judge the <br />seriousness of the problems detected and the anticipated remaining life of the <br />structure. <br /> <br />4-2.4 Inspection Scheduling. <br /> <br />Scheduling is necessary to insure that the planned inspection program is <br />accomplished within the time and resources available. Scheduling helps to <br />achieve a well-organized, complete, and efficient inspection. Factors which <br />should be considered when developing an inspection schedule include: <br /> <br />a. Inspection Type--Inspections which collect SI&A and other supplemental <br />information must be made at least every two years. More frequent or interim <br />inspections may also be needed. For example, when there is a risk of damage <br />to a structure by high stream flows, the structure should be inspected after <br />major storms. Similarly structures with a history of significant structural <br />deficiencies such as excessive tearing of the bolt holes, severe corrosion in <br />corrugated metal structures, or severe invert or crown cracking in concrete <br />structures, should be inspected frequently until the problem is resolved. <br />Hydraulic deficiencies causing severe embankment erosion, stream alignment <br />changes, or undermining of the structure may also require interim inspections. <br /> <br />Such interim inspections may be limited to the critical areas affected by the <br />deficiency. Other types of interim inspections may also be necessary. For <br />example, culverts with multiple barrels or flat gradients should be checked <br />frequently for blockage. Small culverts that are performing well may be <br />assigned an inspection frequency that is longer than two years. However, new <br />culverts should be checked at least once a year for the first two years. <br />Structural problems in culverts are often related to improper construction <br />practices such as inadequate compaction and poor bedding preparation. <br />Construction related problems are frequently evident within the first year <br />after construction. <br /> <br />b. Inspection Resources--The manpower, equipment, and materials required to <br />perform an inspection program should be determined and then compared against <br />available resources to identify additional resource requirements in <br /> <br />50 <br />