Res 2021-064/approving Substantial Amendment No. 10 to the Community Development Block Grant-Disaster Recovery (CDBG-DR) Action Plan

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Intersection improvements are proposed including curb cuts and inlet Asouth sidestorm sewer system drains parts of Smith Ln, River Rd, : By adding a new central storm drain system to Conway & Barbara Drives Low Moderate Income In addition to the Blanco River overflow influence on Blanco Gardens, during City staff and emergency management has indicated that the IH-35/Aquarena Approximately 82 properties would benefit during local rainfall events up to 25-year Existing Infrastructure:a small reach of City Storm sewer that both drain to the existing TxDOTditch continuing south to a lake/pit areanear the railroad. Drainage issues:Springs intersection is one of the first major areas within the City to flood when it rains. Topography maps indicate that the lowest point on Aquarena Springs Rd. is located just east of the northbound IH-35 feederroad. Record drawings indicate only 4 TxDOT inlets drain the IH-35 intersection and there is no overland access to the TxDOT ditch for ponded water. This condition results in ponding that limits mobility, and eventually causes flooding of adjacent properties such as the San Marcos Rehabilitation facility. Proposed Infrastructure:improvements adjacent to the low point locations and inlets for the north side/Rehab facility. Clearing of theexisting TxDOT ditch is also proposed as it is currently overgrown, and not well-maintained. Downstream at Davis Road, the exwith 2 additional culverts as not to constrict flow. Lastly the City will consider a future channel along Davis Road or the Railroad near the Lake to connect to the Blanco River, as the Lake is reported to overflow both west and east in heavy events. The project will require coordination with TxDOT for these improvements. Benefits:frequencies with the proposed improvements. Mobility will be improved due to decreased ponding on Aquarena Springs Rd.The project provides LMI benefit, health and safety benefit, helps long-term recovery, and enhances hazard mitigation.National Objective:The Blanco Gardens subdivision is located in San Marcos, TX on the east side of IH-35 from RiverRoad to Bugg Lane and is generally bounded by Bugg Lane on the north, IH-35 on the west, andRiver Road on the east and, south. The area is primarily residential with various types of housingincluding single family, multi-family, as well as manufactured home locations. There are a fewbusinesses located along IH-35, in the Bugg Lane area, and along River Road. The subdivision isentirely located within the 100-year flood plain, as it adjacent to both the San Marcos and BlancoRivers near their confluence. The subdivision is significantly affected by overflows from the BlancoRiver in river events 20-years and above. The subdivision falls within 2 census tracts which are87.99 and 69.88% low-to-moderate income (area weighted composite = 80.58% LMI).Existing Infrastructure:Sturgeon, Claire & Mary with a 60-inch outfall into San Marcos River off River Road. Anorth sidestorm sewer system drains Bugg Lane and River Road with a dual 48-inch outfall to the BlancoRiver.Drainage issues:local rainfall events the existing storm drain system is undersized and does not meet current Citydesign Criteria for a 25-year storm. The project area is fairly flat, and the drainage patterns areundefined in some locations.Proposed Infrastructure connected to the existing storm drain system, and providing a new 60-inch outfall to the San MarcosRiver (supplementing the existing 60-inch outfall); both the existing and proposed systems meet theApartment Ditch are proposed to provide additional relief during lesser events. Road regrading isproposed for this reach of River Road from Linda to Cape Rd. revising the roadwaycross-sectionto drain towards the Woods apartment ditch. Lastly, there is a potential buyout property on Conwaythat may be purchased for use as a drainage easement to add an inlet and lead system to drain the 2.Blanco Gardens