9/24/2023 0 Comments Pond dredging servicesUsually, an average depth is best even if you need to break your single areas into multiple areas with differing depths. There are methods for calculating volume on a grid system but that gets complicated. Once you determine the area you would like to survey, the next step is to determine the depth of sediment. An alternative is using a measuring tape (300’ are common most hardware stores) or even better a range finder (common in hunting and golf applications). Generally finding an area of an impacted area can be done using measurements from aerial images with a scale or measurement tool prior to even getting in the water. One way to estimate the muck below the water is to use the simple formula for determining any volume – length x width x height. But you may be wondering how I can just get an idea of how much is beneath the surface. River Sand can provide a professional survey with sub-centimeter accurate data points. We have our own soil laboratory and work with several independent laboratories for analysis. River Sand can collect samples using Vibracore, various hand-held sediment samplers, sludge judge, or even an Eckman dredge/sampler. Surveying can also help identify issues common with dredging such as coarse debris, uneven surfaces, stumps/logs, and other anomalies. Depending on the project you may only need a certain set of data to base your dredging project on. Surveys may include core sampling to determine the density, composition, particle size distribution, and other sediment characteristics by depth. Hydrographic surveying is a broader term that includes mapping both the water depth and sediment characteristics. Sedimentation surveys will include the location and depth of sediment relative to the water surface and most of the time the hard-pan (original lake bottom) that is typically denser composition material (clay, rock, liner, etc.). Water depths are an important aspect when planning where to dredge, if a dredge will have enough water to float, or how far to lower the water level. Bathymetric surveying usually refers to mapping the top of the surface below the water surface. An unsuccessful dredging project may quickly end because of poor planning and not knowing what to expect below the water surface.
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