![making a map layer in pcswmm and zooming in making a map layer in pcswmm and zooming in](https://i1.rgstatic.net/publication/354071664_ArcDrain_A_GIS_Add-In_for_Automated_Determination_of_Surface_Runoff_in_Urban_Catchments/links/6123a7290c2bfa282a63ade9/largepreview.png)
These maps can be used to develop flood related emergency response procedures. The modeled water surface profiles (elevations) can be imported in a GIS and overlayed upon the terrain surface to create flood maps and determine which areas will be inundated. While the use of GIS and the process to gather and record data were not without problems, the overall value of GIS was found to overweigh those challenges (Sheydayi, 1999). The lessons learned from this mapping project indicate that GIS is useful in capturing and communicating a vast amount of information about the study area and the river. Six layers were created for flood protection related work: 100-year floodplain, 100-year flood way, 25-year interim line, existing facilities, proposed facilities, and flood deposition. Attribute data were entered into a separate database and later linked to the appropriate map location.
![making a map layer in pcswmm and zooming in making a map layer in pcswmm and zooming in](https://i.ytimg.com/vi/H1XhSLI7-bM/maxresdefault.jpg)
A 1 inch = 400 ft (1 cm = 122 m) scale base map was created to show topography, planimetric features, and parcels. A GIS overlay process was used to further plan efforts and identify conflicting uses along the river and areas for enhancing stakeholder objectives. For example, GIS was used to develop a River Management Plan for the Santa Clara River in Southern California.
#Making a map layer in pcswmm and zooming in verification
GIS is ideally suited for various floodplain management activities such as, base mapping, topographic mapping, and post-disaster verification of mapped floodplain extents and depths.