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SWG-2023-00232 - Texas Department of Transportation-Houston District - unnamed tributary to West Fork San Jacinto River (Outfall Ditch #13) - Harris County, Texas

USACE Galveston District
Published May 18, 2023
Expiration date: 6/20/2023
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Public Notice          Project Plans         Alternative Analysis and Mitigation Plan

The Texas Department of Transportation (TxDOT)-Houston District proposes channel maintenance on Outfall Ditch #13 between Farm-to-Market Road (FM) 1960 and East Townsen Boulevard (Blvd.) (CSJ 1685-03-107) that will result in approximately 3.825 acre of permanent impacts to the WET1 emergent wetland as a result of excavation, grading, and placement of 21,600 cubic yards of fill (concrete Flexamat and native fill) throughout the channel and 1.406 acres of permanent impacts to IS1 intermittent stream as a result of construction, grading, and placement of 3,600 cubic yards of fill (gabion baskets and native fill).  The proposed project consists of the realignment, recontouring, and armoring of approximately one mile of Outfall Ditch #13 and the replacement and reconditioning of several culverts that drain adjacent properties.  The project proposes to recontour and armor the channel with concrete rip rap to a 4- to 6-foot width and a 2:1 side slope which would promote a more efficient continuous drainage towards the listed intermittent stream (IS1).  The project would recontour and stabilize the banks at a 3:1 slope with tied concrete control mats known as Flexamat.  The Flexamat would provide the necessary stabilization to support high volume and velocity flows through the channel as well as to allow herbaceous vegetation to re-establish through the mat.  In addition, gabion baskets will be placed along both banks of IS1 and side slopes will be recontoured to a 3:1 side slopes.  Other activities include the replacement of metal pipe culvert outfalls with reinforced concrete pipe culverts.  The existing box culvert at Townsen Blvd. would remain in place.