The control of Stormwater runoff will be a critical component of the site development work on the Cafritz Property in Riverdale Park. Stormwater Management (SWM) control will help provide 100 year flood control and water quality protection. It will also help protect existing natural resources, and be part of the drainage solution in Wells Run. The stormwater from Cafritz Property will drain to three (3) primary points:
- The western end of site drains south along U.S. Route 1 to Wells Run.
- The north eastern portion of the site drains to an existing 24 inch culvert under CSX rail lines, which will be upsized. There is a 48 inch storm drain on the east side of the CSX line that was designed to handle the 10 year storm from the west side of the CSX line. This 48 inch culvert is undersized for the flow draining to it. For this reason we will be providing slightly better than 100 year SWM control to this point.
- The south eastern portion of the site drains along Maryland Avenue to the culvert under the CSX rail line.
The property is currently in residential zone, R55. As developed, it will be denser than a typical R55 development, but will discharge water at a rate equivalent to or less than that required in the R55 zone. It is anticipated that SWM on the Riverdale site will be accomplished using a variety of control methods including:
- The riverine park will be designed along the eastern edge of the property. It will provide 100 year Stormwater control for the undersized culvert, (to be increased in size) under the CSX rail line and downstream through the Center for Physics site. It will also provide water quality control using created wetlands and vegetated swales. This facility will be connected to the proposed Trolley Trail and will include recreational opportunities for use by residents.
- Environmental Site Design (ESD) features, which are part of the 2007 State SWM Act and included in the County new SWM bill (CB-15), will be used to provide water quality control in each of the drainage areas on the property. Methods used will include roof top disconnects, bioretention, as well as other ESD devices such as rainwater Cisterns and/or rain barrels, pervious paving, microbioretention and landscape infiltration.