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Showing 1 to 20 of 144 for “"HEC"”.
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Uganda Manafwa River early flood warning system development hydrologic watershed modeling using HEC-HMS, HEC-RAS, ArcGIS
… with downstream stream discharge using ArcGIS, HEC-HMS and HEC-RAS. This work is dedicated to present the progress in the modeling endeavor, provide technical guidance to the extent possible, and facilitate hydrologic modeling efforts of similar nature. The main focus is on the loss methods used …
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Development of HEC-HMS and HEC-RAS models for urban floodplain mapping and flood damage reduction in Brownsville, Texas
The primary objective of this project was to develop hydrologic and hydraulic models for the floodplain analysis for Brownsville, Texas and analyze mitigation alternatives within a Geographic Information Systems (GIS) and digital data framework. This framework allowed for flexible manipulation of …
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Flood Capacity Improvement of San Jose Creek Channel Using HEC-RAS
… for steady and unsteady state open channel flow, HEC-RAS is used to analyze multiple variations in channel geometry and combinations of lining materials. Of these modifications, the best configuration is suggested.</p>
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Assessment of HEC-18 equations for NCHRP abutment scour based on Kansas field data
… method outlined in this document was adopted by HEC-18 as an alternative method for use in the estimation of scour depths due to abutment scour. This new method requires field review. The purpose of this report is to verify the validity of the NCHRP Abutment Scour Equations derived from …
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Assessment of HEC-18 scour equations for bottomless culverts based on Kansas field data
One of the main causes of bridge failure is scour at the abutments or piers. Scour is caused by increased velocities of water through bridge openings. Sediment is carried away from the foundations by high flows causing the bridge to become unstable and possibly collapse. Bottomless culverts have …
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Reliability Analysis of the HEC-18 Scour Equation and AASHTO Deep Foundation Design Codes
… Specification. The design methods were the HEC-18 pier scour equation used to determine the scour depth, and the α-Method and Nordlund-Thurman Method used to design the driven pile. The limit state considered was the axial bearing resistance of the piles in the soil. The reliability indexes …
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Hydrology of the Beaver Creek watershed using the TR-20 model and the HEC-HMS program
… Engineering Center - Hydrologic Modeling System (HEC-HMS) Program. The main objective of this study was to estimate the peak discharges and obtain runoff hydrographs at various locations along the Beaver Creek watershed for return periods ranging from 1-year to 100-years. This study presents a …
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Spatial Distribution of Human Elephant Conflict (HEC) and Characterization of Crop-Raiding Elephants in Kasigau Region, Kenya
<p>Human-elephant conflict (HEC) is complex and a serious elephant conservation concern across Africa and Asia where elephants are found. HEC occurs whenever people and elephants share common interests. For HEC to be ameliorated and elephant conservation to be successful locally and regionally, the …
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Application of HEC-HMS 3.4 in estimating streamflow of the Rio Grande under impacts of climate change
… Engineering Center — Hydrologic Modeling System (HEC-HMS) software was adopted to simulate streamflow for different climate change scenarios for the Rio Grande watershed above Elephant Butte Dam. The historical monthly streamflow, precipitation, and temperature of the tributary areas for the Rio …
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Development of a HEC-HMS model to inform river gauge placement for a flood early warning system in Uganda
… warning. A hydrologic model was developed using HEC-HMS software to determine if this warning is feasible and, if so, to facilitate the optimum placement of a gauge. The HEC-HMS model relates precipitation upstream to river flow downstream. Using an historical precipitation event, the model was …
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Determining the optimal river gauge location for a flood early warning system in Uganda using HEC-RAS and AHP
… gauge at Busiu Bridge. The hydraulic model HEC-RAS was used to simulate the flow of the Manafwa River through Butaleja. Based on flow data from a storm event in 2006 when precipitation was fairly widespread across the watershed, the HEC-RAS results indicated that the travel time for a flood …
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Integration of hydraulic model (HEC-RAS) and geographical information system (GIS) in development flood evacuation center along Sembrong River sea
… and its access route could be managed through HEC-RAS and GIS software as both are useful instruments for mapping and analyzing the situation. The objectives of this study are to determine flood prone area of Sembrong River in two-dimensional (2D) view by using HEC-RAS, to evaluate the …
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Rainfall-runoff changes due to urbanization: a comparison of different spatial resolutions for lumped surface water hydrology models using HEC-HMS.
… Engineering Center Hydrologic Modeling System (HEC-HMS), two different modeling methods were evaluated at the different sub-watershed resolutions for four rainfall events. Calibration results indicate using the smaller spatial resolutions improves the model results. Different scenarios for land …
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A comparative study of two unsteady one-dimensional open channel flow models: Full Equations Model (FEQ) and River Analysis System (HEC-RAS)
… 2 ANCALLEREYES-THESIS-2016.pdf: 3655444 bytes, checksum: 385d4d0a582d06143f4a234615d4b796 (MD5) LICENSE.txt: 4216 bytes, checksum: 2841bd6314d7d46e50a381add01791a3 (MD5) Previous issue date: 2016-07-22
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Hydraulic Modeling of a River Network for Predicting Flood Inundation using HEC-RAS and GIS Models - A Case Study in Southern Virginia
… a watershed located in south central Virginia. A HEC-RAS hydrodynamic model of the main river network was developed to assess the impact of a number of hydrologic events, including the Probable Maximum Flood (PMF), in the area of interest. The primary goal of the study was to transform discharge …
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Hydrologic Modeling of a Probable Maximum Precipitation Event Using HEC-HMS and GIS Models - A Case Study of Two Watersheds in Southern Virginia-
… located in south central Virginia. For each, a HEC-HMS event-based hydrologic model was constructed to simulate the rainfall-runoff response from the Probable Maximum Storm (PMS), the theoretical worst-case meteorological event that is capable of occurring over a particular region. The primary …
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Effect of Spatial Scale on Hydrologic Modeling in a Headwater Catchment
… Southwest Virginia. The two models employed were HEC-1, an event based lumped model, and TOPMODEL, a continuous semi-distributed model. These models were used to investigate (a) the issue of spatial scale in hydrologic modeling, and (b) two approaches to modeling, continuous versus event based. …
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Riverine flooding using GIS and remote sensing
… Engineering Center River Analysis System (HEC RAS) and HEC HMS models, developed by the USA Hydrologic Engineering Center of the Army Corps of Engineers in a data-poor environment of a developing country were successful, as a flood modeling tools in early warning systems and land use …
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