High Plains Aquifer Hydrogeologic Characterization, Mapping, and Modeling Act - (Sec. 3) Directs the Secretary of the Interior, through the United States Geological Survey and in cooperation with the High Plains Aquifer States (Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming), to establish and carry out the High Plains Aquifer Comprehensive Hydrogeologic Program to characterize, map, and model the High Plains Aquifer.
Lists as Program objectives to: (1) provide for the hydrogeologic characterization, mapping, and modeling of the Aquifer through a cooperative partnership effort between the U.S. Geological Survey and the High Plains Aquifer States; (2) coordinate Federal, State, and local data, maps, and models into an integrated physical characterization of the Aquifer; (3) support State and local activities with scientific and technical specialists; and (4) undertake activities and provide technical capabilities not available at State and local levels, as may be requested by a participating State's Governor.
Directs the Secretary to establish a Review Panel to: (1) evaluate the proposals submitted for funding under this Act; and (2) review and coordinate Program priorities. Requires the Panel to consult with the Association of American State Geologists and the Western States Water Council.
Requires that 50 percent of the funds appropriated to carry out the Program be allocated equally by the Secretary for the participation of State and local agencies and institutions of higher education within each of the participating States. Authorizes the Secretary to make grants from such funds based on proposals that have been recommended by a Governor and reviewed by the Panel. Requires proposals for multistate activities to be recommended by the Governors of all the affected States.
(Sec. 4) Requires the Secretary to: (1) include reports on the Program in the annual budget documents for the Interior Department (the initial report to contain a Program plan developed with the concurrence of the Review Panel); and (2) submit an interim and final status report to the Governors of the High Plains Aquifer States.
(Sec. 5) Authorizes appropriations.