Abstract
 A GIS-Based Methodology for the Delineation of Undeveloped Sewer Shed Boundaries Track: Water, Wastewater, and Stormwater Author(s): Dennis Lamb, Scott Humphrey, Jeffrey Kirshberg A major challenge facing water agencies is the accurate projection of future wastewater flows in undeveloped areas. A critical element in this analysis is the development of well-defined sewer shed areas, which clearly delineate the directionality of future wastewater flows. Advances in GIS technology, coupled with the increased availability of GIS data, have created powerful new tools in attacking this crucial problem. A GIS-based approach was recently adopted to redelineate sewer sheds in undeveloped portions of the Vallecitos Water District (VWD). Beginning with a USGS digital elevation model (DEM) grid, a set of topographic contours were extrapolated. Portions of these were supplemented with more accurate contours available from several different GIS databases. A triangulated irregular network (TIN) was then created, which formed the basis of a relief map. Utilizing this map, distinct sewer shed boundaries were delineated, which when overlaid with orthophotography, clearly indicate the directionality of future wastewater flows for each sewer shed. Dennis Lamb Vallecitos Water District Engineering 201 Vallecitos de Oro San Marcos , CA 92069 US Phone: (760) 744-0460 Fax: (760) 744-3507 E-mail: dlamb@vwd.org Scott Humphrey Infrastructure Engineering Corporation Planning and Information Services 717 Pier View Way Oceanside , CA 92054 US Phone: 760-529-0795 Fax: 760-529-0785 E-mail: shumphrey@iecorporation.com Jeffrey Kirshberg Infrastructure Engineering Corporation Planning and Information Services 717 Pier View Way Oceanside , CA 92054 US Phone: 760-529-0795 Fax: 760-529-0785 E-mail: jkirshberg@iecorporation.com |
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