; (2) the installation of drought-relief groundwater wells for Indian tribes and in wildlife refuges and other areas; (3) the acquisition or assistance in the acquisition of water from willing sellers to enhance stream flow for the benefit of fish and wildlife (including endangered species), water quality, river ecosystem restoration, and other beneficial purposes, to be carried out in accordance with the water acquisition program established under section 3; (4) agricultural and urban conservation and efficiency projects; (5) exchanges with any water district willing to provide water to meet the emergency water needs of other water districts in return for the delivery of equivalent quantities of water later that year or in future years; (6) maintenance of cover crops to prevent public health impacts from severe dust storms; (7) emergency pumping projects for critical health and safety purposes; (8) activities to reduce water demand consistent with a comprehensive program for environmental restoration and settlement of water rights claims; (9) the use of new or innovative on-farm water conservation technologies or methods that may— (A) assist in sustaining permanent crops in areas with severe water shortages; and (B) make water available for other beneficial uses; (10) activities that protect, restore, or enhance fish and wildlife habitat or otherwise improve environmental conditions, including water quantity or quality concerns and improved fish passage; (11) activities reducing or preventing groundwater depletion or promoting groundwater recharge; (12) technical assistance to improve existing irrigation practices to provide water supply benefits; (13) the investigation of, and pilot projects for, brackish water development and aquifer storage and recovery; (14) the lining of irrigation ditches and canals to reduce water loss and improve efficiency