Method for carrying out nighttime inspection of a wastewater network?
asked 23 March 2016 asked by EtLeMondeSeraMeilleur (780 points)
Hello, First, in order to better divide the network into sections, you have to visually inspect it by opening the manholes that cover any areas where several headraces or large service pipes meet. Having this additional information will help you fine-tune subsequent surveys by having eliminated those sections with little groundwater infiltration.
Hello, I have observed this kind of operation many times and at a minimum this is what is required: Locate daytime network Set up specific measuring point in a strategic location, no time limit Nighttime measures at strategic points on the network with a dipstick (height of flow rule, hence the need for preliminary daytime visit to confirm diameter, slope, accessibility...) Can be coupled with storm and sector readings, depending on what is available Comparison between recorded information and field measurements Field measurements need not be totally accurate; what you are looking for is a trend, but you absolutely need a timestamp against which to measure for comparison Generally, this type of operation helps orient more precise investigations and therefore saves time and boosts efficiency. Depending on budget and the time constraints, it might be worth surveying high and low water tables and dry vs. rainy weather or leaving the measuring devices at strategic points long enough to couple them with storm readings and a piezoelectric sensor (if groundwater measuring is possible). That way you could get some solid data on the source of invasive groundwater. Hoping that helps you.
You can approach this like one would for setting up a new IPP. If not familiar than EPA web site has lots of links information. But the first step of a user survey via windshield reviews and water usage will map out general areas for light industry, residential, commercial etc. Overlay of the collection system to sample in system at key drainage points - at night - to understand flow and loadings during this times will add to your knowledge of who and what is out there. Hope this helps