Modern Roundabout Feasibility Study - City of Frisco

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OHIO DRIVE ROUNDABOUT FEASIBILITY STUDY, CITY OF FRISCO Figure 17 – Proposed Ultimate Roundabout: Ohio Drive at Warren Parkway BROWN & GAY ENGINEERS, INC. 16
OHIO DRIVE ROUNDABOUT FEASIBILITY STUDY, CITY OF FRISCO 5.0 DRAINAGE AND UTILITIES 5.1 Drainage The analysis Assumptions for the concept-level drainage evaluation for Ohio Drive at Gaylord Parkway and Ohio Drive at Warren Parkway are as follows: • The existing pavement will be preserved as much as possible for the proposed roundabouts • The drainage patterns will not be significantly altered by the roundabouts • The impervious cover will be reduced by reducing pavement areas and increasing landscaped island areas, resulting in reduced run off into the existing drainage system • Existing drainage inlets will be relocated as necessary, and new inlets will be added where potentially needed and connected to the existing storm sewer system • The size of inlets and connecting pipes will be similar to the existing For the Gaylord Parkway roundabout, the proposed storm sewer system will consist of roughly seven new inlets and 380 feet of pipe connections into two separate existing storm sewer systems that drain the intersection: • One storm sewer system runs east-west under the west leg of Gaylord Parkway and flows west to connect with another existing system at Preston, which ultimately flows south to an outfall that is unknown at this time. • The second storm sewer system flows north to Warren and eventually outfalls into an existing 8’x4’ MBC structure. For the Warren Parkway roundabout, the proposed storm sewer system will consist of approximately four new inlets and 60 feet of pipe connections into the existing storm sewer system that flows west and outfalls to an existing 8’x4’ MBC structure. The analysis Assumptions for the concept-level drainage evaluation for Ohio Drive at Prestmont Place are as follows: • The roundabout will be built with new pavement and will be connected to the existing pavement on each approach to the intersection • Drainage patterns will not be significantly altered except within the roundabout • Impervious cover will remain practically unchanged • Existing drainage inlets will be relocated as necessary, new inlets will be added where potentially needed and connected to the existing storm sewer system • The size of inlets and connecting pipes will be similar to the existing For the Prestmont Place roundabout, the proposed storm sewer system will consist of approximately four new inlets and 90 feet of pipe connections into the existing storm sewer system that flows south to Warren and then west, and outfalls to an existing 8’x4’ MBC structure. A topographical survey will be performed during the preliminary design phase to develop an accurate drainage and grading plan for each of the roundabouts. 5.2 Utilities This section provides a summary of potential utility conflicts at each of the study intersections. The existing (above ground) utilities were identified in the field. Research regarding the locations of underground public and private utilities was conducted. Based on the available data provided by each utility entity and field reconnaissance, the following information was found: 5.2.1 Ohio Drive at Gaylord Parkway Electric: The depth of the underground Oncor Electric line that runs along the west side of Ohio Drive will need to be determined prior to the construction of several medians and sidewalks connected to the western leg of the intersection. There is a large above ground transformer box located at the southwest corner of the intersection. This box will not be affected under the proposed roundabout concept. However, the potential need for an eastbound right-turn by-pass lane in the future would require the relocation of this transformer. Communications: AT&T has underground telecommunication lines that run along the south side of Gaylord Parkway and along the west side of the northern leg of the intersection. Construction of various medians, sidewalks, and full depth pavement near the southwest corner may affect these communication lines, depending on how deep they are. Gas: There are no gas conflicts identified at this intersection. Water: The depth of the water lines that run along the north side of Gaylord Parkway and the west side of Ohio Drive will need to be determined. The water line that turns near the northeast corner of the intersection may possibly be affected by the full depth pavement construction. There are no relocations of fire hydrants needed at this intersection. However, existing water valves may require adjustment. BROWN & GAY ENGINEERS, INC. 17
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Modern Roundabout Feasibility Study - City of Frisco

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