Marketing Paragraph: Statement of Purpose: The goal of this poster is to showcase the enhancements to the performance of the NDOT silt trap by establishing the most feasible and effective installation (MFE-I) and developing appropriate design guidance.
Full Abstract: Complete Proposal for Your Session: Construction activities have the potential to cause sediment discharge into surrounding areas. Due to this risk, various detention measures are implemented to capture the sediment by impounding runoff and facilitating settling. State DOTs specify different best management practices according to the drainage area, design life, duration of upstream disturbance, and other applicable parameters. The Nebraska Department of Transportation (NDOT) implements silt traps for areas up to one acre. A silt trap is an excavated ditch across the path of water to form a ponding area. It can often include a silt check which comes in several forms. The project seeks to evaluate the silt trap standard using full-scale techniques. The flowrate and sediment introduction rate mimic NDOT highway construction conditions by averaging the Loess Hills and Loess Hills and Glacial Drift regions of the state. These regions experience the heaviest rainfall and contain more erosive soils. Based on the results from testing the standard practice, modifications will be added to enhance performance. The effectiveness of each modification will be established by comparing the water quality samples from each test to the samples from the standard test. The water quality will be determined from the turbidity and total suspended solid results. Other data collection measurements will include the impoundment lengths, the sediment capture, the storage volumes, and the dewatering times. The goal is to enhance the performance of the Nebraska Department of Transportation silt trap by finding the most feasible and effective installation (MFE-I) and develop the appropriate corresponding design guidance.
Learning Objectives:
At the conclusion of this presentation, attendees will:
Evaluate each modification performance by compariosn.
Understand the process of full-scale testing.
Identify which mdoification was most effective and feasible.
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