Acronyms & Abbreviations Below is a list of acronyms and abbreviations found within this website. Adopted Regional Plan The Regional Water Planning Group officially adopted their plans, prior to submission to the TWDB in January, 2001. Approved Regional Plan An adopted plan must be officially approved by the TWDB. Once approved, it is ready for incorporation into the Statewide plan ED Environmental Defense IPP Initially Prepared Plan NWF National Wildlife Federation RWPG Regional Water Planning Group SB1 Senate Bill 1 SB2 Senate Bill 2 TCEQ Texas Commission on Environmental Quality TCPS Texas Center for Policy Research TPWD Texas Parks and Wildlife Department TWDB Texas Water Development Board page top close window