Measurement of Quantities

Provide calculations for payments in the DWR remarks bubble. When measurements cannot be described as shown below, computer measurements or drawings for irregular areas will be acceptable as supporting documentation.
  • EXAMPLE:
    A section of riprap measures 100 FT by 3 FT and is 5 IN thick. Calculate the area and volume of the riprap.
    • Area = Length × Width = 100 FT × 3 FT = 300 SF
    • Area in SY = 300 SF ÷ 9 SF/SY = 33.33 SY
    • Depth = 5 IN x 1 FT/12 IN = 0.417 FT
    • Volume = Length × Width × Depth = 100 FT × 3 FT × 0.417 FT = 125 CF
    • Volume in CY = 125 CF ÷ 27 = 4.63 CY
  • EXAMPLE:
    A one-mile highway was striped with 4-in. white broken stripe. Calculate the quantity placed.
    • 1 MI = 5,280 FT
    • 1 broken stripe = 10 FT of stripe + 30 FT of spacing between stripes
    • 1 MI = 5,280 FT ÷ (10 FT + 30 FT) = 132 stripes per MI
    • 132 Stripes per MI x 10 FT of stripes = 1320 LF of stripes
Partial payments to an item of work can be made when agreed upon. Items such as embankment cannot truly be measured; therefore, payment can be made by percentage or by station range if earthwork tables are provided. Cast-in-place inlets are completed in multiple stages, so partial payments in the form of percentages can be made. Document reasons for partial payments in the payment portion of the DWR.