• Why does adding a spillway as a separate pond outlet all of a sudden cause it to engage when it previously wasn't?

    I am modeling a pond with a composite outlet structure (riser with orifice openings). My pond has a spillway and at first i was modeling the riser/ orifice and spillway as a single composite structure connected to an outlet pipe. After some research on…
  • How does PondPack calculate the rating curve for an irregular weir (specifically a trapezoidal weir)?

    I have tried to replicate the calculations using the standard weir equation [Q = CLH^(3/2)], but have since realized that PondPack must be applying an additional factor to the calculation that is based on the head, because the factor varies as the head…