Temporary sheet walls can be seen along the right and left side of Rio Piedras, where drill shafts are being installed in order to build permanent retention walls between the confluence structure of the Margarita Channel and the Rio Piedras and the abutment wall of the De Diego Bridge in San Juan, Puerto Rico. The 2D Walls contract is part of the Rio Puerto Nuevo flood control project, once completed the project is intended to provide flood protection for near 7,500 residents and 700 commercial and public structures valued at over $3 billion.