Local Road Management Manual 368 DISTRESS SCALES SEVERITY The severity of rutting is calculated according to the average rut depth for both inner and outer wheel paths. This is the sum of the readings ≥ 5mm over the number of readings ≥ 5mm. It is recorded to one decimal place in units of millimeters as shown in the example opposite. EXTENT The extent is calculated by the Data Entry Spreadsheet (DESS) as the percentage of the area with rutting ≥ 5mm in depth and is recorded to one decimal place as shown in the example’s opposite. 3.1.6. Wearing Surface (Raveling /Flushing) Assessed over total area of segment Example: (Assessed over total carriageway area of segment) In the first 100m of a segment there are flushing in both wheelpaths each 0.5m wide and 70m long, in the third and fourth 100m segments there is raveling the entire length and lane width. The wearing surface will be recorded as follows: