IH-35 Northbound Ramps

San Antonio, TX

This project consisted of constructing one new at-grade off ramp and one at-grade off ramp just north of the intersection of Walzem Road.  These ramps provide access off of IH-35 Northbound lanes to the frontage road and access onto the NW Loop 410 West frontage road.  This project also includes a new direct connector overhead bridge, which connected the IH-35 NB frontage road with the IH-35 NB main lanes. There were various drainage aspects associated with this project. VICKREY's scope of work for this project was to prepare a hydrology and hydraulics (H&H) drainage report detailing the results of the analysis of the drainage aspects associated with the construction of the three roadway ramps.  We conducted hydrology and hydraulics analysis based on the proposed ramps and bridge layouts to design a drainage concept, which allowed for proper conveyance of the existing storm water runoff patterns created by this construction project. Our analysis and design of the drainage components for this project included:  the sizing and placement of on grade inlets along the direct connector bridge, sag inlets in the median areas to control storm water runoff that has been cut off by the proposed ramps, storm sewer design to convey impeded runoff, and detention pond design to mitigate for increased runoff.