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Source: https://erdc-library.erdc.dren.mil/jspui/ The purpose of monitoring the Demonstration Erosion Control (DEC) Project is to evaluate and document watershed response to the implemented DEC Project Documentation of watershed responses to DEC Project features will allow the participating agencies a unique opportunity to determine the effectiveness of existing design guidance for erosion and flood control in small watersheds. The monitoring program includes 11 technical areas: stream gauging, data collection and data management, hydraulic performance of structures, channel response, hydrology, upland watersheds, reservoir sedimentation, environmental aspects, bank stability, design tools, and technology transfer. This report includes detailed discussion of the eight technical areas that were investigated by the U.S. Army Engineer Waterways Experiment Station during Fiscal Year 1994, i.e., all of these areas except upland watersheds, reservoir sedimentation, and environmental aspects. In the area of data collection and data management, installation of continuous stage gauge instrumentation at 33 sites and crest gauges at an additional 42 sites was completed and data collection initiated. The initial development of the engineering database on Intergraph workstations was completed and made available to the U.S. Army Engineer District, Vicksburg, for testing. In the area of hydraulic performance of structures, a model study to determine the feasibility of a low-drop structure using a 10-ft drop was conducted. Selected high- and low-drop structures were instrumented with stage gauges. The stage data will be used in calculating discharge coefficients for rating curves. In the area of channel response, the ftrSt detailed topographic survey of the 20 long-term sites was completed. The initial broad-based geomorphic studies of 1 watersheds and detailed geomorphic studies of 3 watersheds were completed. In the area of hydrology, development of HEC-1 hydrology models for 10 watersheds was initiated. The evaluation of the CASC2D hydrology model using the Goodwin Creek watershed was initiated. In the area of bank stability, a model study to determine the applicability of the bend way weir concept for bank stabilization was conducted. In the area of design tools, a riser pipe design system housed on the engineering database (Intergraph) was developed, tested, and made available for District use on the Coldwater River watershed. In the area of technology transfer, a video report on the DEC Project was completed, and a second video report on channel degradation processes was initiated. NOTE: This file is large. Allow your browser several minutes to download the file.

Source: https://erdc-library.erdc.dren.mil/jspui/ The purpose of monitoring the Demonstration Erosion Control (DEC) Project is to evaluate and document watershed response to the implemented DEC Project. Documentation of watershed responses to DEC Project features will allow the participating agencies a unique opportunity to determine the effectiveness of existing design guidance for erosion and flood control in small watersheds. The monitoring program includes 11 technical areas: stream gauging, data collection and data management, hydraulic performance of structures, channel response, hydrology, upland watersheds, reservoir sedimentation, environmental aspects, bank stability, design tools, and technology transfer. This report includes detailed discussion of the eight technical areas that were investigated by the U. S. Anny Engineer Waterways Experiment Station during Fiscal Year 1993. i.e., all of these areas except upland watersheds, reservoir sedimentation, and environmental aspects. In the area of data collection and data management, installation of continuous stage gauge instrumentation at 33 sites and crest gauges at an additional 42 sites was completed and data collection initiated. The initial development of the engineering database on Intergraph workstations was completed and made available to the U.S. Army Engineer District, Vicksburg, for testing. In the area of hydraulic perfonnance of structures. a model study to determine the feasiblity of a low-drop structure using a 10-ft drop was conducted. Selected high- and low-drop structures were instrumented with stage gauges. The stage data will be used in calculating discharge coefficients for rating curves. In the area of channel response. the first detailed topographic survey of the 20 long-term sites was completed. The initial broad-based geomorphic studies of 10 watersheds and detailed geomorphic studies of 3 watersheds were completed. In the area of hydrology. development of HEC-1 hydrology models for 10 watersheds was initiated. The evaluation of the CASC2D hydrology model using the Goodwin Creek watershed was initiated. In the area of bank stability, a model study to determine the applicability of the bend way weir concept for bank stabilization was conducted. In the area of design tools, a riser pipe design system housed on the engineering database (Intergraph) was developed, tested, and made available for District use on the Coldwater River watershed. In the area of technology transfer, a video report on the DEC Project was completed. and a second video report on channel degradation processes was initiated.

Source: https://erdc-library.erdc.dren.mil/jspui/ The sedimentation study conducted on the Redeye Crossing Reach of the Mississippi River about 3 miles downstream of Baton Rouge, LA, was a combination of numerical and physical movable-bed model studies to aid in the development of a satisfactory dike design for this reach. A two-dimensional numerical model, TABS-2, was used to predict the reduction in dredging that could be anticipated with the original dike design and subsequent modifications. Those modifications included changing the length, height, location, and number of spur dikes. The plans investigated addressed the required dike plan to maintain the existing 40-ft navigation channel through the reach and an enhancement of that plan to provide a 45-ft channel to be developed in the near future. Since no dikes presently exist in this portion of the Mississippi River, the physical movable-bed model study was also conducted to take advantage of the capabilities of both types of models. Thus the overall study allowed use of the numerical model to screen plans and the physical model to address detailed impacts of the plans. The physical model was constructed to a horizontal scale of 1:240 and a vertical scale of 1:200 including the river channel and overbank areas to the adjacent levees. During the overall testing program the numerical model was used to refine and test dikes plans. The dike plans deemed most successful from the numerical sedimentation model were also tested on the physical model.

Source: https://erdc-library.erdc.dren.mil/jspui/ The purpose of monitoring the Demonstration Erosion Control (DEC) Project is to evaluate and document watershed response to the implemented DEC Project. Documentation of watershed responses to DEC Project features will allow the participating agencies a unique opportunity to determine the effectiveness of existing design guidance for erosion and flood control in small watersheds. The monitoring program includes 11 technical areas: stream gaging, data collection and data management, hydraulic performance of structures, channel response, hydrology, upland watersheds, reservoir sedimentation, environmental aspects, bank stability, design tools, and technology transfer. This report includes detailed discussion of the eight technical areas that were investigated by the U.S. Army Engineer Waterways Experiment Station during Fiscal Year 1992, i.e., all of these areas except upland watersheds, reservoir sedimentation, and environmental aspects. In the area of data collection and data management, installation of continuous stage gauge instrumentation at 33 sites and crest gages at an additional 42 sites was completed and data collection initiated. The initial development of the engineering database on Intergraph workstations was completed and made available to the U.S. Army Engineer District, Vicksburg, for testing. In the area of hydraulic performance of structures, a model study to determine the feasibility of a lowdrop structure using a 10-ft drop was conducted. Selected high- and low-drop structures were instrumented with stage gauges. The stage data will be used in calculating discharge coefficients for rating curves. In the area of channel response, the first detailed topographic survey of the 20 long-tern sites was completed. The initial broad-based geomorphic studies of 10 watersheds and detailed geomorphic studies of 3 watersheds were completed. In the area of hydrology, development of HEC-1 hydrology models for 10 watersheds was initiated. The evaluation of the CASC2D hydrology model using the Goodwin Creek watershed was initiated. In the area of bank stability, a model study to determine the applicability of the bendway weir concept for bank stabilization was conducted. In the area of design tools, a riser pipe design system housed on the engineering database (Intergraph) was developed, tested, and made available for District use on the Coldwater River watershed. In the area of technology transfer, a video report on the DEC Project was completed, and a second video report on channel degradation processes was initiated.

Source: https://erdc-library.erdc.dren.mil/jspui/ A numerical sedimentation model study was conducted to determine the effectiveness of the proposed Abiaca Creek sediment reduction scheme under both existing and plan levee conditions. The sediment reduction scheme consisted of controlling the release of sand tailings from gravel mining operations on both Abiaca and Coila Creeks. To perform the analysis, the one-dimensional numerical sedimentation model (TABS-1) was applied with a simulation time of 30 years. The model was not only used to assess the impact of the proposed levee and gravel mining modifications to Abiaca Creek sedimentation, but also to assess change in sand delivery to the Matthews Brake wetlands area under plan conditions.

Source: https://erdc-library.erdc.dren.mil/jspui/ A sedimentation study of a local flood protection project on the South Branch of the Potomac River at Petersburg, WV, was conducted. The investigation represented a sediment assessment level study conducted to test for potential sedimentation problems. Project features for the proposed project included raising existing levees adjacent to the town of Petersburg and adding levees both upstream and downstream from the existing levees and on the opposite side of the river from the existing levees. The approach included the use of a sediment budget analysis to test for deposition of sand and gravel and a field reconnaissance to evaluate overall stability of the existing channel. The sediment assessment is suggested in EM 1110-2-4000, "Sedimentation Investigations of Rivers and Reservoirs," for use in early stages of project formulation such as the reconnaissance stage to help identify potential sediment problems. The assessment technique used in this study is a software package for a personal computer titled Hydraulic Design of Flood Control Channels, generally referred to as SAM. The SAM assessment indicated that the project will be subject to some aggradation during the 25-year and larger floods. However the amount of aggradation should not be severe enough to affect project integrity. The local sponsor should monitor the channel, including approach and exit reaches, by periodic resurveys of established sediment ranges.

Source: https://erdc-library.erdc.dren.mil/jspui/ A sedimentation study of a local flood protection project on the Rio Hondo through Roswell, NM, was conducted. The investigation represented a sediment assessment level study conducted to test for potential sedimentation problems. Project features for the proposed project included channel grade control structures and a side-channel detention basin. The approach included the use of a sediment budget analysis to test for deposition of sand and gravel and a field reconnaissance to evaluate overall stability of the existing channel. The sediment assessment is suggested in EM 1110-2-4000 "Sedimentation Investigations of Rivers and Reservoirs," for use in early stages of project formulation such as the reconnaissance stage to help identify potential sediment problems. The assessment technique used in this study is a software package for a personal computer titled Hydraulic Design of Flood Control Channels, generally referred to as SAM. The SAM assessment indicated potential sedimentation problems, resulting in severe approach channel deposition for the sediment yield tested.