Don't forget to include the albedo, dry adiabatic rate, losses to bank storage, phase of the moon, tidal surges, barometric pressure and spilled beer into the calculations...
But seriously, if they increased the flow in the morning, then it may be fine for the Numbers but by the time it got to Parkdale, it may not be until late afternoon or night. Thinking about it, there's probably a surface water model that will tell how long it takes for a hypothetical molecule of water (or a spilled tanker of gasoline) to go from any one point to another along the river. They need to know that kind of thing so that water suppliers along the river know when to shut their intakes in the event of spills (Golden has one for Clear Creek).
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse