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La Mesa Watershed

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Introduction

Michael Diamond February 27, 2009 Block F Mr. Cheatle The Current State of Water Supply to Metro Manila from La Mesa Watershed A) The Physiological, Hydrological, Ecological and Management Issues at La Mesa Watershed Reservation 1. Introduction La Mesa Dam (Figure 1.0) is located in the Novaliches Watershed. The Novaliches Watershed is a drainage basin that covers land in Quezon City, Caloocan City and the Rizal Province. The drainage basin surrounding the La Mesa reservoir covers 2700 hectares, of which 2000 hectares is forest cover. It supplies around 4 billion liters of water per day. Ninety seven percent of Metro Manila's water supply comes from this source. Therefore, careful management is needed for this area, because of its vital importance to the health and life of the 12 million people in Metro Manila. This report will showcase the physiographic features and vegetation of La Mesa. It will also explain the hydrological system of La Mesa, the water supply, the way the water is treated and made safe for drinking. Finally, it will also include ideas as well as the pros and cons for new water sources. Figure 1.0 2. The Setting: Physiographic Features, Vegetation, Soils and Rocks Figure 1.1 The main physiographic features include: a gently undulating landscape, many small narrow streams, some streams are so small that they aren't seen since they are passing through rock. The highest elevation is 118 meters (387 feet.) The height of the reservoir (at lake level) is 78-80 meters above sea level. The main river system in La Mesa is the Calumpit River. ...read more.

Middle

Figure 1.9 Figure 2.0 When raw water enters La Mesa Dam it carries a lot of dust, germs, sediment and other minerals, so when it enters the filtration plant (Figure 1.9) it is given a pre-chlorine treatment to kill the germs in the water. After this step, coagulants (Alum and Polymer) are added into the water to make the dust, sediment and other dissolved minerals coagulate and group together. When they group together they attain the appearance of yellow soap bubble "lumps" (Figure 2.0). These lumps float to the surface or sink to the bottom. Then the water passes through the flocculators, where the "lumps" which float on the surface are removed. Then the water passes through the sedimentation basin where the "lumps" that sink to the bottom are removed. After passing through the flocculators and sedimentation basin, the water is injected with chlorine again. Afterwards the water passes through filtration beds, these filtration beds act as strainers; each one is smaller than the next, to remove microscopic impurities in the water. After passing through the filtration beds the water is given a final treatment of chlorine to kill any germs or microbes that was left over from the previous chlorine treatments. Then, after undergoing the final chlorine treatment the water is pumped to the taps in Metro Manila. D) Ideas for increasing the Water Supply 7. Providing for Growing Water Needs: Developing new water sources In 2007 Greenpeace released a study,4 which reported that the quality of fresh water in the country was declining; and the quantity of water was declining as well. ...read more.

Conclusion

P.S. RES. NO.35. Republic of the Philippines. 22 Feb 2009 <http://www.jambymadrigal.com/resolutions_2007/res_35_La%20Mesa%20Resolution.pdf>. 4 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 5 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 6 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 7 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 8 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 9 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 10 MWSS, "Laiban Project." Metropolitan Waterworks and Sewerage System. MWSS. 22 Feb 2009 <http://mwss.gov.ph/projects.php?id=11>. 11 MWSS, "Laiban Project." Metropolitan Waterworks and Sewerage System. MWSS. 22 Feb 2009 <http://mwss.gov.ph/projects.php?id=11>. 12 Burgonio, TJ . "MWSS to tap Laiban Dam as new source of Metro Manila water." Haribon. 15/Oct/2007. Haribon Foundation. 22 Feb 2009 <http://www.haribon.org.ph/?q=node/view/496>. 13 MWSS, " Angat Water Utilization and Aqueduct Improvement Project (AWUAIP)." Metropolitan Waterworks and Sewerage System. MWSS. 22 Feb 2009 <http://mwss.gov.ph/projects.php?id=10>. 14 MWSS, " Angat Water Utilization and Aqueduct Improvement Project (AWUAIP)." Metropolitan Waterworks and Sewerage System. MWSS. 22 Feb 2009 <http://mwss.gov.ph/projects.php?id=10>. 15 MWSS, " Angat Water Utilization and Aqueduct Improvement Project (AWUAIP)." Metropolitan Waterworks and Sewerage System. MWSS. 22 Feb 2009 <http://mwss.gov.ph/projects.php?id=10>. ?? ?? ?? ?? ...read more.

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