Engineering References:

• Equivalent pipe sizes for parallel pipes:
  Reference matrix to lookup equivalent pipe size from two parallel pipes using standard pipe diameters.
• Head due to pipe friction:
  Reference matrix to lookup velocity and head loss for a given pipe size and flow using Hazen Williams Equation.
• SCS Unit Hydrograph data and regression equation
  Provides the data points of the NRCS (formerly SCS) Unit Hydrograph and a regression equation to calculate the unit hydrograph data points for any desired time step.
• USGS NPS Data (Hardee, Mattraw, Miller, 1979)
  This is a MS Access mdb file compressed in zip format containing all of the rainfall and flow data from this study. This rare data set is not widely available in digital format.