GRANT:The design team submitted a LID grant application to the San Antonio River Authority on behalf of the City of San

Antonio. The project was awarded a $100,000 grant through a competitive process. SARA will also verify performance

and viability of the BMPs for up to two years after construction is completed.

DESIGN PRINCIPLES:The central guiding objectives for the design include:

• Increase levels of safety and enhance the perception of safety,

• Highlight pedestrian and bicycle connections,

• Enhance and generate memorable places,

• Create an environmentally sound urban space using low impact techniques, facilitate ecosystem

services

• Lay the foundation for a future corridor streetscape to mature and last the test of time

• Improve economic vitality of the area.

UPLAND HABITAT

BIORETENTION BASIN

STREAM NATURALIZATION

“TRIBUTE” SCULPTURE

NATIVE GRASSES

RIPARIAN CORRIDOR

BUTTERFLY & HUMMER PLANTINGS

BIORETENTION BASIN

Proposed Development

Existing Conditions

FLOW OVERBANKING& UNDERMININGSIDEWALL OF CHANNEL

JBSA PROPERTY

TXDOT PROPERTY

HWY 90

SW M

ILITARY DR

CONCENTRATEDFLOW FROM OFF-SITE300 ACRE WATERSHED

CHANNELED FLOWCONTINUES TO LEON CREEK

FLOW FROM ROAD

CORRIDOR GATEWAY PHASE 1:In October 2014, the City Council allocated funding for Phase 1, the Lackland Corridor Gateway, to serve as a

catalyst to stimulate the urban vitality of the community surrounding JBSA-Lackland. To provide a place of ‘lasting

impression’ in a well-designed environment, the corner of US Hwy. 90 and SW Military Drive—the most visible location

along the Corridor as the gateway to Lackland Air Force Base- was chosen as the site. The site, partially owned by

TxDOT and partially by the Joint Base San Antonio (Air Force), will be transformed into a park setting by a City of

San Antonio capital improvements project. In November 2015, the Council accelerated funding for the complete site

design and construction with an aggressive 6-month design schedule. The project is currently in final negotiation with

the contractor with an anticipated construction schedule of 6 months. Construction is slated to begin in November

2016. The City of San Antonio Parks department will assume maintenance of the project after the contractors 1 year

warranty period ends. Total project funding has been allocated at $6.1 million.

Site Enhancements - Consistent with the Lackland Corridor Streetscape Conceptual Master Plan (2014 RVK), the

development of the most visible location along the corridor known as the Gateway Project. A five acre parcel at the

intersection of U.S. Highway 90 and SW Military Drive accepts and carries drainage from a larger watershed west and

north of the site. A paved channel bottom transitions to a full concrete channel southeast of the site and northeast of

JBSA Lackland proper. Design enhancements include but are not limited to the following:

• Storm water improvements to existing channel

– stream naturalization

• Storm water management including

area planted LID features in its final

configuration161 Trees with automatic bubbler

irrigation system for establishment

• 161 Trees with automatic bubbler irrigation

system for establishment Picnic unit with

shade canopy

• Area Parking (19 spaces)

• Picnic unit with shade canopy

• Restroom Port a Unit with its enclosure

• 75’ Monument (Tribute) by local artist George

Schroeder, lit at night with LED light fixtures

• Walkways with Two architectural pedestrian bridg-

es Sidewalks

• Three overlook nodes with interpretative graphic

panel and seating area

• Entry Wayfinding SignART:The focus of the gateway, the monumental sculpture- TRIBUTE, serves as an icon associated with Lackland Air Force Base within the City of San Antonio. The

sculpture, created in collaboration between the Project Landscape Architect and local Artist George Schroeder, consists of five forms. The arrangement creates

a gathering space intended to be dynamic and interactive as it can be touched, walked within and around. Its aesthetic is that of an airplane and by riveting the

aluminum cladding to the substructure, it replicates aircraft construction. With the forms seemingly rising out of the ground, the monument captures light, reflects

the sun and casts large shadows.

The tallest element is an obelisk-type form reaching 75’ high representing our country and the community of San Antonio. The narrowest edge of the obelisk is

aligned to our nation’s capital paying homage to Washington, D.C. The three arched forms represent the arms of the military protecting our great Nation. Each

arm displays one of the three Core Values of the United States Air Force. The fifth element serves as the direct reference to Lackland Air Force Base. The form

representing a wing is intentionally placed at an angle to contrast with the other elements, contributing to the visual tension of the overall piece.

From dusk to dawn, the experience of the gateway is enhanced through the use of LED lighting. Six days a week, white light will illuminate the sculpture. On

Fridays, to celebrate the weekly graduation of over 500 new Airmen, United States Air Force blue will illuminate the interior space of the sculpture proclaiming

the significance of this day.

MASTER PLAN:The vision of District 4 City Councilman Rey Saldaña is to recognize the value of Joint Base San Antonio-Lackland

as part of the history and future of San Antonio as Military City USA. The design intentions of the streetscape

enhancement conceptual master plan are two-fold:

• Leave a lasting first impression on the thousands of family members of freshly-minted Air Force Cadets and

• Integrate vehicular traffic into an efficient and complete street that supports pedestrians, bicyclists, and

users of public transportation.

DISTRICT 4 COUNCILMAN: REY SALDAÑA

PROJECT MANAGER: ALMA NUNEZ

PRESENTER: TROY DORMAN, PhD, P.E., CFM TETRA TECH

LACKLAND CORRIDOR GATEWAY

ABSTRACT:The Lackland Corridor Gateway Monument project is centered on a sculpture honoring the Air Force basic training

mission at Lackland AFB in San Antonio, Texas. The site, partially owned by TxDOT and partially by the Joint Base

San Antonio (Air Force), will be transformed into a park setting by a City of San Antonio capital improvements project.

The transformation starts with removing 900 ft. of existing poor functioning concrete stormwater drainage channel and

lifting it to a higher functioning ecological state through stream restoration. The restoration will reduce stream velocity

and reconnect the stream to its floodplain to reduce downstream flooding. Runoff from all new onsite parking areas

will be managed through a bioretention area sized to capture the 90th percentile storm and then slowly released into

the stream to provide high quality base flow. Two additional bioretention areas will capture the 90th percentile storm

from adjacent roadways that drain through the site reducing pollutant loads, erosion, and mitigating the peak flow

effects from impervious cover. The integration of native and site appropriate vegetation including riparian, upland, and

grassland species improves viability of the site and reduces water usage. The proposed tree canopy includes 161

native trees, carefully selected vegetation and also a butterfly habitat for the endangered Monarch Butterfly. The site

will include interpretive signage to inform visitors of the LID features and their benefits to human habitat. The project is

currently in final negotiation with the contractor and will complete construction within 6 months. The City of San Antonio

Parks department will assume maintenance of the project after the contractors 1 year warranty period ends. The San

Antonio River Authority, who selected the project for a competitive $100,000 LID grant, will also verify performance

and viability of the BMPs for up to two years after construction is completed.

SITE

STREAM RESTORATION

BMP - PARK SITE

LID Strategies Master Plan

ECOSYSTEM SERVICES:This project affords the opportunity to enhance the ecosystem services of our urban environment. Ecosystem services are the processes by which the environment

produces resources that offset our everyday lives. The goal of the site development is to restore or supplement four categories of ecosystem services: provisioning

(production of food/water); regulating (climate control/ disease control); supporting (nutrient cycles/crop pollination); and cultural (spiritual/recreational benefits).

Urban Riparian Reforestation:Concerned with the rapid development of its region, the City of San Antonio engaged American Forests to complete an urban systems analysis (updated May 2009). The report quantified the impact of the changing land cover for the mitigation of storm water run-off, air and water pollution, and the provision of carbon storage and sequestration. The anticipated quantified value to the ecosystem services through the new native riparian and upland tree plantings on this +5-acre site prorated in context of the May 2009 updated American Forests Canopy Analysis equates to:• 2.06 acres of tree canopy.• Management of 27,872 cubic feet of storm water; estimated value of $17,860 annually.• Removal of 364 pounds of air pollutants; estimated value of $865 annually.

• Storage of 140 tons of carbon sequestrating 29 tons per year.

Stormwater Management:Drainage from the 360-acre watershed west of Military Drive passes through a box culvert

bridge beneath the roadway as it flows toward Leon Creek. The +5 acres present an

opportunity to incorporate structural storm water best management practices (BMP’s) to

facilitate enhancing water quality while reducing the transport of pollutants within the Leon

Creek Watershed through the inclusion of LID strategies. LID strategies being implemented

include:

• Regenerative landscape - The integration of native and site appropriate vegetation

including riparian, upland, and grassland species improving the viability of the site

and reducing water usage.

• Biofiltration for removal of contaminants and pollutants from roadway and parking

lot paving via three bioretention features – two located along the street frontage

and one within the site treating storm water runoff from the parking lot

• Impervious cover limits

• Building materials - limiting the use of materials that contribute to water pollution

• Shade structure canopy runoff diversion to bioretention area

• Floodplain Depressions- include vegetated swales, detention/infiltration basins

with biotic habitat.

• Litter control

• Waterway/stream naturalization to replace a poorly functioning concrete channel

with a stable healthy stream.

The transformation starts with removing 900 ft. of existing poor functioning concrete stormwater drainage channel

and lifting it to a higher functioning ecological state through stream restoration. The restoration will reduce stream

velocity and reconnect the stream to its floodplain to reduce downstream flooding. The stormwater treatment plan

involves restoration of the channel to provide ecological uplift, shading of the stream and floodplain depressions that

will reduce velocity and trap sediment. Although this project will modify the stream channel, the overall impacts will

be positive for water quality and stormwater management. The onsite stormwater management features will serve to

reduce runoff, improve water quality, capture floatables and sediment and reduce the flashy nature of urban roadway

runoff. This is especially true for smaller storm events that create most of the erosion and cause the majority of stream

stability issues that lead to flooding problems. Furthermore, in compliance with E.O. 11988 and E.O. 13690 and the

subsequent guidelines release by FEMA and the USACE, the planning and design process for this project will result

in meeting the goal “to restore and preserve the natural and beneficial values served by floodplains”. By removing

the concrete channel through the majority of the site, past federally funded actions that removed the natural stream

function will be mitigated resulting in a net benefit to floodplain.

The onsite stormwater management plan includes three bioretention areas to capture and treat the first 1.5 inches of

runoff. Two bioretention areas will capture the 90th percentile storm (1.5 inches) from adjacent roadways that drain

through the site, reducing pollutant loads, reducing erosion, and mitigating the peak flow effects from impervious

cover. The third bioretention area will mitigate the impact of the parking lot, driveway, restroom, and walkways that

are being added to the site. All three bioretention areas will have underdrains due to the high groundwater and clay

soils onsite. The underdrains will slowly release clean runoff into the stream to provide high quality base flow.

INTERPRETIVE OPPORTUNITIES:The site will include interpretive signage to inform visitors of the LID features and their benefits to both human and wildlife habitat. The four interpretive

opportunities encompass three overlook nodes around the perimeter of the stream basin and specific planting areas. The graphic panels afford the

opportunity to learn about:• The role of the military to San Antonio and inspiration behind the monument. • Low Impact Development (LID) systems, • Channel realignment and naturalization of the drainage way• Carefully selected vegetation and also a butterfly habitat for the endangered Monarch butterfly, as well as migrating birds, supporting our City

Mayor Ivy R. Taylor’s commitment as the first Monarch Champion participating in the National Wildlife Federation’s Mayor’s Monarch Pledge.

25

Revised Results2 Year Event Depth

Lackland AFB Corridor Gateway

28

Modeling the 100-Year Event to Check overbank stability

Lackland AFB Corridor Gateway

2-YEAR EVENT - STREAM RESTORATION 3D MODEL

100-YEAR EVENT - FLOOD PLAIN 3D MODEL

PEDESTRIAN VIEW FROM SW MILITARY HWY

EXISTING CONCRETE CHANNEL

INTERACTIVE BIORETENTION PLAN INTERACTIVE BIORETENTION PLANTING PLAN

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STA:0+36.36ELEV:731.42

STA:0+62.93ELEV:731.42

STA:0+71.40ELEV:731.42

STA:0+10.54ELEV:737.00

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36" RECLAIMEDWATER LINE

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STA:0+45.77ELEV:736.00

STA:0+45.77ELEV:736.25

HWY 90ACCESS ROAD

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CHEngineering - Planning - Transportation - Related Services 415EMBASSY OAKS - SUITE 205 San Antonio, TX. 78216

OFFICE: (210) 341-6200 FAX: (210) 341-6300FIRM NUMBER: F-8478

WBS 23-01455

07/19/2016

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CHEngineering - Planning - Transportation - Related Services 415EMBASSY OAKS - SUITE 205 San Antonio, TX. 78216

OFFICE: (210) 341-6200 FAX: (210) 341-6300FIRM NUMBER: F-8478

WBS 23-01455

07/19/2016

TBPE Firm No. F-3924700 N. Saint Mary's Suite 300San Antonio, TX 78205210.299.7905 www.tetratech.com

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BIORETENTION SECTION A

7

Evaluating the Results for Existing Conditions

Lackland AFB Corridor Gateway

EXISTING FLOOD PLAIN 3D MODEL

STREAM RESTORATION PLAN

SINGLE DROP CROSS VEIN DETAIL 2

DOUBLE DROP CROSS VEIN DETAIL 1

BIORETENTION BASIN SECTION

BUTTERFLY & HUMMER PLANTINGS

BIORETENTION BASIN

SWITCH GRASSFROG FRUIT

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