Gives Toward a Common Supply

Gives toward a common supply. A crossword clue in The Mail on Sunday newspaper on 10 September 2017, 11 letters.

The answer: CONTRIBUTES

Gives toward a common supply in example

The two previous models can be easily adapted to the operation in concert of multiple and parallel reservoirs where each is fully devoted to water supply. We illustrate the multiple-reservoir model with three reservoirs that are on
roughly parallel and non intersecting streams. Withdrawals are made from each reservoir and these withdrawals sum gives toward a common supply.