Keep and Dampen options and their effect on the four main terms of the St Venant equation
Note: The Keep and Dampen options and their effect on the four main terms of the St Venant equation. The Keep and Dampen options and their effect on the four main terms of the St Venant equation in SWMM5 by dickinsonre Note: The Keep and Dampen opt ions and their effect on the four main terms of the St Venant equation. The four terms are are used in the new flow for a time step of Qnew: Qnew = (Qold – dq2 + dq3 + dq4) / ( 1 + dq1) when the force main or gravity main is full dq3 and dq4 are zero and Qnew = (Qold – dq2) / ( 1 + dq1) The dq4 term in dynamic.c uses the area upstream ( a1 ) and area downstream ( a2 ), the midpoint velocity, the sigma factor (a function of the link Froude number), the link length and the time step or dq4 = Time Step * Velocity * Velocity * (a2 – a1) / Link Length * Sig...