If I dump 500 gallons of water all at once on a concrete slope, it has zero chance of being absorbed and decreased in volume by any absorption by the surface under it. It also makes sense that the surface properties are a large determining factor. The steeper the ground, the faster gravity can move the water. The accumulation of storm water depends on many factors like the rate of rain or snow melt, the pitch of the slope in the immediate area, and the type of surface that it falls on. The damage caused by stormwater can be minimal or catastrophic, like the flooding damage caused by hurricanes. An extreme volume example is a flooded river with a car bobbing up and down in it as it goes on its merry way.ĭepending on the situation, stormwater can be a harmless annoyance, or it can be dangerous, like when it kills people who think they can make it through that giant lake on the road or go over a bridge that has water running over it. A simple low volume flow example would be a tree branch that flows downhill into a stream. The contaminants can also be sediment that has been eroded by the hydraulic force of the moving water and has continued to be carried by the force of the flow.ĭepending on the rate of rainfall/melt, the hydraulic force produced by the movement of water can also collect large objects into its stream of flow and continue to carry them along. Stormwater consists of the original water and any other elements, whether they are liquids or solids, that have dissolved into the water or are being carried by the water.Ĭommon contaminants contained in stormwater include pesticides, chemicals, deicers, road salt, oil, grease, you get the picture about possible liquids that can be absorbed easily by running or pooling water. Stormwater is usually caused by heavy rainfall or significant amounts of snow melting at once. Spagco can also supply threaded inserts or mounting brackets for installing ultra sonic sensors or other flow measuring devices as required.Stormwater is the run-off or pooling of rain, melting snow, or any precipitation types in between that cannot be absorbed quickly enough by the surface it falls on. If the water level at gauge #2 is higher than indicated the incoming water in a submerged flow condition and the chart will have to be adjusted to accommodate that flow. Table #2 indicates the flow rate in cubic feet per second under free flow conditions as well as the maximum height at gauge to as compared to the gauge #1 reading for free flow to exist. This gauge allows a quick visual check for determining whether the flow is in free flow or submerged flow. The second gauge is set at a point 2” back from the downstream edge of the throat of the flume. This first gauge is for measuring the flow into the system. The first gauge is set at a distance of 2/3 of the wall length of the approach side of the flume as measured from the start of the flume throat toward the inbound flow. Spagco Parshall Flumes come standard with two built in gauges. Parshall in 1922 and are shown in attached table #1 plus drawings #1 & #2. All Parshall Flumes are made to same dimensions established by Dr. The superior strength of the sandwich panel construction allow the flume to act as the concrete form as the concrete trench wall are cast with no need for any internal bracing. Due to the high moment of inertia of the wall due to the thickness, no stiffeners or other braces are required. All Spagco flumes have a total wall thickness of 1 ½”. Spagco Parshall Flumes are constructed from a fiberglass composite constructed of two fiberglass skins with a polymer concrete core.
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