An examination of major flooding events in Northern New Castle County, Delaware is presented in the context of the discrimination between flooding due to landuse change and flooding due to anomalous heavy rain events. The Christina River Basin encompasses the Red and White Clay Creek Watersheds. These basins are the focus of this study because of their short response time, shift to suburban landuse types, and impact on approximately 165, 000 people in southeastern Pennsylvania and northern Delaware. The Christina basin has recorded many floods since record keeping began approximately 70 years ago, These floods were classified according to the synoptic weather situation that was responsible for the flooding. A qualitative synoptic classification identified four general synoptic types responsible for flooding including tropical storms, frontal systems, coastal storms/nor'easters and convective systems. Stream gages across the Christina Basin have seen an increase in the frequency of flooding and in some cases an increase in the strength of the flooding over time.Processing starts with a raw DEM that is filled. The process of filling sinks in the DEM is explained in the HEC-GeoHMS 1.1 Usera#39;s Manual (USACE, 2003b). From the filled DEM (Figure 6.1), flow direction and stream flow paths are computed.
|Title||:||A Synoptically Guided Approach to Determining Suburbanization's Impacts on the Hydrology of the Red and White Clay Creeks, Pennsylvania and Delaware|
|Author||:||Anne Marina.. Bagwell|
|Publisher||:||ProQuest - 2007|