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StormwaterPrint: Background

The StormwaterPrint effort begins with the documentation of stormwater management practices in Maryland and their associated drainage areas. Stormwater management practices include Best Management Practices (BMPs), stormwater retrofits, and stream restoration projects that control quantity and quality of urban runoff. The Maryland Department of the Environment (MDE) receives specific information from counties and municipalities regarding these practices through the NPDES Permit program and other State programs. The information is in continual state of update, correction, and maintenance. Accuracy and completeness will be achieved over time.

The interactive map displays two sets of data:

The first set is point data that depicts the location of various BMPs throughout the State. BMP is a technique, process, activity, or structure that is used to reduce the pollutant content and/or runoff flow of stormwater discharges. These points have been color coded to represent the State regulatory era in which they were built.

The second set is drainage area to stormwater management facilities, retrofits, and stream restoration projects represented by shaded polygons. A retrofit is either an upgrade to an existing BMP or a new BMP in a development that did not have stormwater management before. Stream restoration includes stabilizing the banks of eroding streams and reconnecting stormwater flow to floodplains.

How to navigate StormwaterPrint interactive map?

The StormwaterPrint interactive map application can be used only after agreeing to the Terms of Use as shown in Figure 1. Once the map appears on your screen, you can pan around and zoom in to see BMP points and drainage area of practices in a particular location, if available (see Figure 2). To choose a location of interest, you can either zoom in and pick a point visually, or search an address by clicking on “Locate Address” tool on the top. The default background on the map is street view as seen in Figure 3. It can be changed to aerial photography view as illustrated in Figure 4 by clicking on “Aerial” tab on top-right corner of the map. Another option is to view data with topography in the background.

To get more information on practices, such as structure type, year built, drainage area, etc., click on “Identify BMP Properties” tool on the top and select a BMP point of your choice on the map. The results will be displayed in a window as shown in Figure 5. The small red icon on the side of the window is a hyperlink to a Fact Sheet that provides detailed information about that particular BMP type. You can also bookmark a location on the map by selecting the "Bookmark" tool.

The “Chart” tool allows you to select a point or an area in a County for further analysis. It provides distribution of all the BMPs in the selected County by creating a chart. An example can be seen in Figure 6 where a point selected in Baltimore County displays all the BMPs present in the County. You can also compare distribution of BMPs in more than one County by selecting the counties of your interest.





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