INTERNATIONAL BOUNDARY AND WATER COMMISSIONUNITED STATES AND MEXICO

UNITED STATES SECTION

From: Arrey To: Little Box Canyon

Number of Staff: 28

Diversion Dams

International DamAmerican Dam

At the American Dam, we control the flows going to Mexico and divert US flows into the American Canal.

At the International Dam, it is where we actually divert the flows into Mexico.

Before 4/27/2015 (facing upstream)

After 5/27/2015 (facing upstream)

Downstream (current conditions) Upstream (current conditions)

DownstreamUpstream

DownstreamUpstream

Project Area

Current Conditions: 2016

View downstream along Rio Grande at confluence with Guayuco Arroyo to the left

The project area is from the end of the Chamizal concrete channel to the Riverside Dam.

Project Area Outlined in Red

• Sediment Removal on the Rectification Project from station 94+211 (Ft Hancock) to the end of the Rectification Project (Little Box Canyon).

Project Area Outlined in Red

• Maintain efficient water deliveries to:• U.S. Irrigation Districts• Municipalities• Mexico

• Increase in Channel Carrying Capacity• Increase water delivery efficiency• Alleviate backwater conditions that create drainage problems• Increase river bank stability• Improve Operations at Diversion Dams

• Increase in carrying capacity of irrigation canals

SUMMARY

SEDIMENT REMOVAL VOLUMES 2016/17

SITE NAME Volume (CY)Rio Grande Rectification Project

International Dam (Estimated) 19,500

Guayuco Arroyo (Estimated) 20,000

Navarrete Arroyo (Estimated) 40,000

Rio Grande Canalization Project

Tipton Arroyo (Estimated) 2,000

Trujillo Arroyo (Estimated) 9,000

Montoya Arroyo (Estimated) 4,750

Holguin Arroyo (Estimated) 4,000

Tierra Blanca/Green Arroyos (Estimated) 5,500

Montoya Drain (Estimated) 58,250

American Dam (Estimated) 30,000

TOTAL 193,000

Rectification Sediment

Removal Project Volumes

Site Name Estimated CY’s

Rectification Project (5-Yr)

1,904,743

Total 1,904,743

Total Sediment Removal Volumes

2,097,743

Rio Grande Canalization Project

Sediment Trap Design

Thurman I & II Arroyos

Project Area:Rio GrandeCanalizationProject(RGCP)

Project Location

Map displaying extents of Thurman Arroyos & sediment removal alternatives

Design Project Details• Construct Pilot Sediment Traps at mouth of Thurman I & II

Arroyos with prior long excavation• Purpose is to Capture and Remove Arroyo Sediment prior to

reaching the Rio Grande• Design project was awarded in September, 2016• Project Kickoff Meeting scheduled for Oct 20, 2016• Design to be completed in 2017 and construction to begin in

2017/2018