Distributed Sources
This applet modeling is based on a first-order,
at steady state, linear differential equation with constant parameters (flow, area, depth) over a given length:
where:
S = Substance Concentration at x = x(t) (mg/L)
SD = Substance Distributed Concentration (mg//L)
K = Decay Constant (1/day)
t = Travel Time (day) = x / U
U = Stream Velocity (mi/day; mpd)
L = Distributed Source Length (mi)