Floodplain modeling using HEC-RAS - download pdf or read online

By Haestad Methods Water Solutions, David Klotx, Adam Strafaci, Annaleis Hogan, Kristen Dietrich

Assessment in the event that your paintings or educational reports contain floodplain administration, then a duplicate of Floodplain Modeling utilizing HEC-RAS has to be in your table. This entire textbook deals specialist guide and functional suggestion for floodplain modelers and bosses. It then is going a step additional by way of reinforcing the techniques awarded utilizing the global typical simulation instrument HEC-RAS, constructed through the U.S. military Corps of Engineers Hydrologic Engineering heart. In Floodplain Modeling utilizing HEC-RAS, U.S. military Corps of Engineers veteran Gary Dyhouse walks you thru an entire floodplain examine, from the drafting board to settling on the floodway. not more puzzling over which of the large variety of variables to regulate on your version. Get the interior information you must effectively practice HEC-RAS for your tasks. subject matters coated during this textual content comprise: An easy-to-understand advent to open channel hydraulics making plans floodplain modeling stories with defensible time and value estimates Modeling bridges, culverts, and different exact positive factors Calibrating and working versions for height functionality Modeling floodways, together with assurance of FEMA flood assurance directions constructing routing info to be used in hydrology courses Designing and comparing channel adjustments reading bridge scour concerning the software program incorporated every one publication in the Water Modeling assortment from the Bentley Institute Press contains academic-licensed types of the pro software program coated. HEC-Pack for floodplain administration contains 4 industry-standard items built by way of the U.S. military Corps of Engineers Hydrologic Engineering heart. Graphical HEC-1 and HEC-HMS are for hydrograph research, HEC-RAS is for water floor profile research, and HEC-GIS is for integrating floodplain modeling with GIS

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7 for the distribution of discharge and velocity in the section. 82 ) Slopes Two slopes are important in the solution of open channel hydraulics problems: the channel invert, or bottom slope (so), and the friction, or energy grade line, slope (sf ). Calculations proceed from location to location along a stream based on the channel and friction slopes between each pair of locations. 9 illustrates the important variables in the computation process. The channel invert slope is the difference in the channel invert elevation between two locations divided by the distance between the two locations.

The units for velocity are feet (meters) per second. Water movement adds kinetic energy to the system, which is computed using the stream velocity. The kinetic energy term is added to the water surface elevation to calculate the total energy head at a cross section. If the total energy head at several cross sections is connected by an imaginary line, the line is referred to as the energy grade line. 4. 6) where V = the average channel velocity (ft/s, m/s) Q = the flow rate (ft3/s, m3/s) Even though working with average velocities is convenient, the channel velocity is not constant at any location, regardless of whether the channel is prismatic or nonprismatic.

The amount of discharge through the pipe is a function of the pressure differential over the length of the pipe. If the discharge doubles, the pipe cross-sectional area does not change, but the upstream pressure head must greatly increase to force this additional flow through the same pipe area. In open channel flow, boundaries are not fixed by the physical boundaries of a closed conduit; the free surface adjusts itself to accommodate the geometry of the channel. When the free surface adjusts itself, other geometric properties, such as the cross-sectional area, wetted perimeter, and top width, adjust accordingly.

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