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2. International roughness index - Wikipedia

   en.wikipedia.org/wiki/International_roughness_index

   In addition to measuring roughness this system also measures other key pavement attributes such as cracking, rut depth and texture. Less expensive alternatives to profilometers are RTRRMS which do not record the profile but rather are installed in vehicles and measure how the vehicle responds to the pavement profile.

3. Pavement condition index - Wikipedia

   en.wikipedia.org/wiki/Pavement_Condition_Index

   The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]

4. Standard step method - Wikipedia

   en.wikipedia.org/wiki/Standard_Step_Method

   This is illustrated below in the plot of energy vs. flow depth, widely known as an E-y diagram. In this plot, the depth where the minimum energy occurs is known as the critical depth. Consequently, this depth corresponds to a Froude Number of 1. Depths greater than critical depth are considered “subcritical” and have a Froude Number less ...

5. Jersey barrier - Wikipedia

   en.wikipedia.org/wiki/Jersey_barrier

   The UK equivalent is the concrete step barrier. [citation needed] First tested in 1968 by the then Department of Highways in Ontario, Canada, the Ontario Tall Wall is a variant of the Jersey barrier. [10] Standing at 42 inches (107 cm), it is 10 inches (25 cm) taller than the standard Jersey barrier.

6. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   The tread depth of a step is measured from the edge of the nosing to the vertical riser; if the steps have no nosing, it is the same as the going; otherwise it is the going plus the extent of one nosing. The going of a step is measured from the edge of the nosing to the edge of nosing in plan view. A person using the stairs would move this ...

7. Hudson's equation - Wikipedia

   en.wikipedia.org/wiki/Hudson's_equation

   Hudson's equation, also known as Hudson formula, is an equation used by coastal engineers to calculate the minimum size of riprap (armourstone) required to provide satisfactory stability characteristics for rubble structures such as breakwaters under attack from storm wave conditions.