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Distress <br />Quantity <br />Distress <br />Type <br />SDI <br />Distress <br />Severity <br />Figure 6 - SDI Inputs and Detailed Scale <br />Excellent <br />Very Good <br />Good <br />Fair <br />Marginal <br />Poor <br />Very Povr <br />ASTM D6433 covers nearly forty unique distress types that may or may not be present in an agency's <br />road network. For that reason, IMS uses a modified approach that collects the most common and <br />relevant distresses. <br />The descriptions on the following page outline some of the distresses collected for the City: <br />Table 2 - Distress Descriptions <br />Alligator Cracking — Quantified by the <br />severity of the failure and square footage. <br />This cracking is caused by the repeated <br />bending a pavement experiences as vehicles <br />pass over it. The cracks propagate from the <br />bottom, meaning that structural failure has <br />occurred. As a load -associated distress, it <br />has a significant impact on the condition <br />score, even at low extents. <br />Rutting — Starting at a minimum depth of <br />inch, ruts are quantified by their depth and <br />square footage. Rutting is caused by the <br />permanent deformation of the pavement <br />and/or subgrade layers. Low densities of <br />rutting can have a large impact on the final <br />condition score due to their implication of <br />possible structural failure. <br />IMS Pavement Management Report Louisville, CO 2022 Page 19 <br />