; and (B) fewer than 100,000. (2) Natural hazard; resilience The terms resilience and natural hazard have the meanings given those terms in section 1433(h). (3) Resilience and sustainability program The term resilience and sustainability program means Midsize Drinking Water System Infrastructure Resilience and Sustainability Program established under subsection (b). (b) Establishment The Administrator shall establish and carry out a program, to be known as the Midsize Drinking Water System Infrastructure Resilience and Sustainability Program , under which the Administrator, subject to the availability of appropriations for the resilience and sustainability program, shall award grants to eligible entities for the purpose of increasing resilience to natural hazards. (c) Use of funds An eligible entity may only use grant funds received under the resilience and sustainability program to assist in the planning, design, construction, implementation, operation, or maintenance of a program or project that increases resilience to natural hazards through— (1) the conservation of water or the enhancement of water-use efficiency; (2) the modification or relocation of existing drinking water system infrastructure made, or that is at risk of being, significantly impaired by natural hazards, including risks to drinking water from flooding; (3) the design or construction of new or modified desalination facilities to serve existing communities; (4) the enhancement of water supply through the use of watershed management and source water protection; (5) the enhancement of energy efficiency or the use and generation of renewable energy in the conveyance or treatment of drinking water