As a retired Spanish Captain General in December 1733,[4][5] he donated ten thousand pesos drawn from his fortune from the Acapulco-Manila investments.
As nothing happened to this offer, he again bequeathed in a will dated July 27, 1743, the same amount and for the same purpose, with the stipulation[7] that the fund was to be kept separate and devoted to the establishment, erection, and maintenance of waterworks.
[8] The fund was kept separate, accumulated interest, and was further enlarged by a special tax upon meat, devoted to that purpose.
[10] Carriedo did not live to see his resolve of creating a water system in Manila take fruit as the works were finally completed in 1878.
[11] Today a museum stands on the grounds of Pinaglabanan Shrine in San Juan where the El Deposito, or the former reservoir was located, and commemorates Carriedo's contribution to the improvement of Manila's water and sewage system.