|
<br />Wednesday, May 20 10:30 - II :45 AM Track 6 - Mapping TechnUiues III - Moderator: Ken Zwickle
<br />
<br />INNOVATIVE FLOODPLAIN MAPPING PROCEDURES UTILIZED IN DUPAGE COUNTY, ll.LINOIS
<br />J. William Brown, PE, Jonathon p, Steffen, P,E,
<br />
<br />The Stonnwater Management Division of the Department of Envirorunental Concerns of DuPage County, Illinois, is utilizing an innovative
<br />procedure for developing floodplain maps in the County, The process relies on Geographic Information System (GIS) application tools and
<br />uses continuous hydrology, dynamic Wave routing procedures, and the peak-lo-volume statistical approach to develop flood elevations,
<br />
<br />The procedure uses the Hydrologic Simulation Program - FORTRAN (HSPF) to develop the hydrologic inputs for the hydraulic analysis,
<br />The hydraulic routing process uses the model Full Equations (FEQ) to dynamically route the hydrologic inputs through the system. The
<br />determination offlood elevations is based on the peak-to-volume approach. Each of these components will be described, This method has
<br />been applied to watersheds in DuPage County, The results of the floodplain map development for tile Sawmill Creek Watershed will be
<br />discussed,
<br />
<br />RNER HYDRAULICS MODELING USING BOSS RlVERCAD
<br />by Chris E. Maeder, M,S.
<br />
<br />This paper presents an integrated approach that has been developed for performing water swface prome modeling using HEC-2 and HEC-
<br />RAS within a completely self-contained CAD envirorunent. BOSS RiverCAD (BOSS RCAD) has been developed to automate most of the
<br />engineering tasks required to model and analyze water swface profiles using HEC-2 and HEC-RAS and can be used to compute water
<br />surface profiles for modeling bridges, culverts, spillways, levees, bridge scour, floodway delineations, floodplain reclamations, stream
<br />diversions, and channel improvements, Ease of use and apeed were the foremost concerns during the design and development of this
<br />application, We wanted the user to be able to quickly define either a HEC-2 or HEC-RAS model, analyze it, and display its results without
<br />ever leaving the BOSS RCAD environment.
<br />
<br />BOSS ReAD contains a completely self-contained AutoCAD@ and MicroStation@ compatible CAD system, allowing the user to quickly
<br />create professional, ready to submit 3D CAD drawings, In addition, BOSS RCAD directly reads and writes AutoCAD DWG and
<br />MicroStation DGN drawing files, allowing unprecedented flexibility in sharing of data with other CAD systems. BOSS RCAD includes
<br />a sophisticated 3D swface renderer, allowing you to quickly create professional 3D shaded plots of the river reach being studied. BOSS
<br />RCAD is bi-directional, allowing the user to use the same drawing file to perfonn either a HEC- 2 or HEC-RAS analysis, Conunon data is
<br />shared among the HEC-2 andHEC-RAS input data dialog boxes wherever possible, This allows the user to quickly switch from one model
<br />to the other with a minimum amount of work. For example, all cross-section geometry, roughness coefficients, expansion and contraction
<br />loss coefficients, reach lengths, and discharge values, just to name a few, are shared between the two models, BOSS RCAD allows the user
<br />to quickly develop a model, analyze it, and display the analysis results, Its graphical CAD interface mables the user to work directly from
<br />a map, thereby vastly savin~ time,
<br />
<br />USING GIS TO MAP FLOOD INUNDATION AREAS
<br />Joseph 1. Jones
<br />
<br />Most flood inundation maps prepared for the National Flood Insurance Program are over 10 years old, and in many cases, they are out-of-date
<br />due to changes in climate or land use, or simply due to the collection of additional peak flow data. Because of the high cost of updating
<br />inundation maps using traditional methods, a pilot study was conducted to evaluate the strengths and weaknesses of using Geographic
<br />Infonnation Systems (GIS) to map inundation. In addition to costing a fraction of the expense of traditional methods, this technique offers
<br />added benefits, such as the ability to map depths of inundation and identify areas where flooding is uncertain, but also has shortcomings,
<br />such as the lack of ability to update the floodway,
<br />
|