HOUSTON — Even a week after it slammed into the Texas coast, Harvey retained enough rain-making power Friday to raise the risk of flooding as far north as Indiana. Back in Houston, officials tried to safeguard parts of their devastated city by intentionally flooding others.The mayor announced plans to release water from two reservoirs that could keep as many as 20,000 homes flooded for up to 15 days.In another Texas city with no drinking water, people waited in a line that stretched for more than a mile to get bottled water while others awaited evacuation flights.Residents of the still-flooded western part of Houston were told Friday to evacuate ahead of the planned release from two reservoirs protecting downtown. The move was expected to flood homes that were inundated earlier in the week. Homes that are not currently flooded probably will not be affected, officials said.It could take three months for the Addicks and Barker reservoirs, which are normally dry, to drain. The Harris County Flood Control District said it had to continue releasing water to protect their structural integrity and in case more heavy rain falls.Some of the affected houses have several feet (meters) of water in them, and the water reaches to the rooftops of others, district meteorologist Jeff Lindner said.