Drainage and Water Quality
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Crystal Brook Flood Control Project - Austin
One of the largest drainage improvement projects undertaken by the City of Austin. Over 175 homes located in the Crystal Brook neighborhood were threatened by frequent flooding and have building floor elevations below the 100-year storm water surface elevations. The objective of this project is to perform hydrologic and hydraulic analyses to study the existing conditions, to develop proposed improvement alternatives to alleviate the flooding problems and to prepare construction documents for the construction of the selected alternative. Extensive hydrologic and hydraulic investigations and modeling were performed to identify the drainage conditions for the Walnut Creek adjacent to the neighborhood. The computer models and equations used to simulate the watershed conditions included the U.S. Army Corp of Engineers HEC-1, IFH, HEC-2 and HEC-RAS programs, Soil Conservation Service TR-20 program, FHWA HY-8 program, and U.S.G.S. Regression Equations. The proposed improvements consisted of approximately 16,600 lineal feet (ranges from 18” RCP to 12’ x 7’ concrete box) of storm sewer lines, 7,000 lineal feet (ranges from 6’ wide to 100’ wide bottom) of channel improvements and 5,700 feet of flood barrier system. This project also included over 2,000 lineal feet of creek bank stabilization and restoration.
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Zilker Park Landfill Drainage Improvements - Austin
The project sits on Parks and Recreation Department (PARD) land that was previously used as a landfill site. The site is bounded by Town Lake to the north, Mopac Expressway to the east, Stratford Drive to the south, and Eanes Creek to the west. The purpose of the project is to provide drainage and erosion control improvements for the subject tract and a portion of Eanes Creek overbank, which has been experiencing erosion exposing some landfill materials. Specifically, an armored channel for flow conveyance through the site and slope stabilization along the east bank of Eanes Creek is proposed. RC&A performed hydrologic & hydraulic analysis for the contributing drainage area upstream of the project site, designed channel improvements (using 6” Conlock with vegetation infill and covered with biodegradable soil retention blankets) to convey runoff, designed a liner system (using Geomembrane EPDM Rubber Liner) for the new channel that was accepted by Texas Commission on Environmental Quality and developed bank stabilization (using vegetated reinforced soils, vegetation planting, soil retention blanket, rock riprap, limestone blocks and AKWARDRAIN) for Eanes Creek.
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Los Indios Culvert Upgrade and Channel Improvements - Austin
The Los Indios subdivision and Los Indios Trail is located in northwest Austin in the Rattan Creek watershed. The southern project limit is approximately 150 feet south of Los Indios Trail. The northern project limit is approximately 150 feet north of an existing on-line pond outlet structure and embankment downstream of Los Indios Trail. The eastern and western limits are defined by existing fence lines along the channel and pond side slopes. A preliminary engineering report completed in January 2001 by City of Austin indicated that the Los Indios Trail roadway is overtopped by Rattan Creek during the 10-year and greater return period storm events. The City study also identified seven (7) homes in the vicinity of Los Indios Trail that are at risk of flooding in the 100-year storm event. RC&A was contracted by City of Austin to refine the Study, using on-the-ground topographic survey, developed alternatives to mitigate the culvert and local flooding problems and prepared construction plans for the proposed improvements.
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Thornberry Road Culvert and Roadway - Austin
Assist prime consultant to develop engineering design addressing the periodic flooding associated with an unnamed tributary of Crson Creek (Thornberry Tributary) as it passes over Thornberry Road after leaving Austin Bergstrom International Airport (ABIA) in Travis County, Texas. Flooding on Thornberry Road was caused by the lack of a culvert and the height of the road as it crosses the stream (i.e., low water crossing conditions). As a subconsultant, RC&A provided roadway and culvert design services at Thornberry Drive which included the preparation of plans, specifications, and construction estimates (PS&E). The project limits for RC&A’s culvert and channel improvement design was from approximately 75 LF downstream of the culvert to approximately 150 LF upstream of the culvert. RC&A prepared culvert improvement plan, using Hanson’s Crownspan (4 sections of 1 – 16’ wide x 6’ high), channel improvement plan (using soil retention blanket, rock riprap and mortared rock wall), roadway improvement plan and traffic control plan.
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Tannehill Branch, Erosion Control Projects at Givens Park and Bartholomew Park - Austin
Bartholomew Park. Coordinated with subconsultant to prepare “natural channel” design which incorporates floodplain creation and bioengineering to maintain bed load transport and flow conveyance in a stable channel system. A HEC-RAS model was prepared to determine depth, velocity, and shear stress for the bankfull and flood storm events. Prepared construction documents including grading control structures, stream bank restoration plan and cross-sections, drop structure and stilling basin and construction specifications. Provided construction phase services. Givens Park. Performed field reconnaissance, prepared preliminary design and final design to stabilize the stream banks and maintain bed load transport. Different techniques such as geogrid, large boulders, erosion fabrics, and bioengineering were employed to manage the channel erosion while creating a natural channel appearance. Prepared construction plans including erosion / sedimentation control plan, stream bank stabilization plan and cross-sections, construction details and dewatering plan, prepared project manuals, and provided bid support. Provided construction phase services to insure general conformance with the construction documents.
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Shoal Creek Greenbelt Hike and Bike Trail Repairs - Austin
The Shoal Creek Hike and bike trail experienced erosion problems in the lower reaches of Shoal Creek, often completely washing the trail out at some locations along the top of the channel banks. The project designed solutions for nine separate erosion locations along Shoal Creek in the area from 6th Street to 29th street. Performed field reconnaissance to rank erosion problems along the creek in order of severity. From this list, nine areas were selected for improvements. Preliminary and final designs were developed using varying techniques such as limestone boulders with geogrid for stability, erosion matting, permeable concrete for trails, and bioengineering were employed to manage erosion of the trails while creating a natural appearance for the channel. Prepared construction drawings including erosion / sedimentation control plans, stream bank stabilization plans, trail traffic control plans, construction details and dewatering plans, prepared project manuals, and provided bid support. Provided inspection and construction phase services, and assisted with change orders and contractor pay applications.
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West Bouldin Creek – Site 97 Water Quality Pond, Austin
The City of Austin (COA) has identified public land within the West Bouldin Creek watershed that offers water quality, erosion control, and low storm intensity flood control to the creek and riparian corridor. The site is referred to as Site 97 within West Bouldin Creek, which encompasses approximately 16-acres. The site is just north of South Center Street and is bounded by the Missouri Pacific railroad tracks to the west and residential development to the east. The scope of work is to gather required design level detail of the site, design Best Management Practices, prepare preliminary design plans and an engineer’s opinion of construction cost for city review. The BMP consisted of a channel runoff diversion structure, a sedimentation / extended detention pond, and a downstream level spreader with a ˝-acre vegetative filter strip prior to discharging flow back into West Bouldin Creek.
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Town Lake Park Wet Pond - Austin
The Town Lake Park water quality wet pond will be located in the northwest quadrant of the Palmer Events Center in accordance with the approved master plan. The pond will collect, treat, and detain stormwater runoff from approximately 18.3 acres of the site, which includes the following areas:
Palmer Community Events Center building (rooftop runoff), parking garage, proposed parking and drive area near the Doherty Arts Center, the children’s outdoor arts center, the open meadow inside the large oval sidewalk, and the area in the immediate vicinity of the pond.
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La Frontera Center, Water Quality & Wet Pond - Round Rock, Texas
The La Frontera Section I and II development in Round Rock, Texas is a 113 acre commercial retail center. The development is located at the northwest corner of IH-35 and FM 1325 in Round Rock, Texas. In addition to complying with the City of Round Rock’s development regulations, a portion of the property lies within the northern Edwards’ Aquifer recharge zone and as such complied with the Texas Commission of Environmental Quality’s (TCEQ, previously the Texas Natural Resources Conservation Commission) Edwards’ Rules (amended 1999). Raymond Chan & Associates, Inc. was in charge of planning and designing a regional stormwater detention facility to protect downstream properties (structures within the floodplain), and to design a stormwater quality treatment facility to help protect the northern Edwards’ Aquifer. In addition, three downstream road crossings (Old West Drive, Purple Sage, and Yucca Drive) were sub-standard and did not allow for safe passage in a 25-year storm event. RC&A performed a hydrologic analysis on this tributary of Lake Creek and designed culvert improvements for the three road crossings.
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ACWP Country Club Creek Stabilization - Austin, Texas
ACWP Various Streambank Projects - Austin, Texas
Avery Drive Drainage Improvements - Taylor, Texas
Barton Hills Road Drainage Study and Improvements - Austin, Texas
Betty Cook Pond - Austin, Texas
Bull Branch Drainage Plan - Taylor, Texas
Colorado River Park Drainage Improvements - Austin, Texas
Donna Drive and Holly Drive, Erosion Controls - Taylor, Texas
Duman Drive and Quail Valley Road, Drainage Improvements - Georgetown, Texas
East 7th Street Storm Drain System Improvements - Austin, Texas
Erosion Control Projects, Group 8 - Austin, Texas
Erosion Control Projects, Group 9 - Austin, Texas
Fort Branch Integrated Solution, Storm Sewer System - Austin, Texas
Greenwood Avenue Channel Improvements - Austin, Texas
Group 9E Street Storm Drain System Improvements - Austin, Texas
Group 33 Local Street Storm Drain System Improvements - Austin, Texas
Reilly School Regional Detention Facility - Austin, Texas
Lower Shoal Creek Greenbelt Erosion Control and Creek Restoration - Austin, Texas
Oak Lawn Storm Drain System Improvements - Austin, Texas
Scenic Brook Flood Control - Austin, Texas
Shoal Creek Brentwood Storm Drain System Improvements - Austin, Texas
Shoal Creek Madison Storm Drain System Improvements - Austin, Texas
Upper Waller Creek Flood Management Plan - Austin, Texas
Victoria Court Channel Improvements - Austin, Texas
Wells Branch Regional Erosion/Flood Control Pond - Austin, Texas
Westover Hills Drainage Improvements - Austin, Texas
Windsor Park Drainage Improvements - Austin, Texas
Zilker Park Archaeological Excavation - Austin, Texas
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