sentences:  The Wawa Dam which serves Manila and surrounding locales had to be replaced due to the growing population of the Manila area.The La Mesa was built in Novaliches, which was then still part of the municipality of Caloocan due to the sloping topography of the watershed area from Bulacan.The La Mesa dam later became part of a larger dam system with the opening of the Ipo Dam in Norzagaray, Bulacan in 1936, the Angat Dam in the same locale in 1967.