Remember the week-long rains last July 19 to 25 wherein the rainwater dumped was comparable in volume to Typhoons “Ondoy” and “Carina"?
Surigao del Sur 1st district Rep. Romeo Momo Sr. identified this freak weather--with accounted for nearly one-third of Metro Manila’s annual average rainfal in just seven days--as a major factor behind the recent episodes of floods. (Video courtesy of House of Representatives)
00:01Mr. Sherman, thank you. May tanong lang ako. This data is taken from FCOS, MMDA.
00:08Noong nakaraang ulan, nakaraang baha, last July 19 to 25, the total rainfall as recorded in the FCOS is 665.5 millimeters,
00:24which is equivalent to 28% of the annual average rainfall in Metro Manila.
00:31Ibig sabihin, sa period ng isang linggo, one-third of the annual average rainfall in Metro Manila binuhos lamang ng isang linggo na ulan.
00:42So, gusto ko lang kasing ipakita rito na lagi kasing nating sinisisi ang flood control.
00:49Hindi natin din tinitingnan kung gano'ng ang bulyom na ipasok o pumasok doon sa mga flood control systems ng MMDA at DPWH.
01:01Now, 28% or almost one-third of the annual average rainfall binuhos lang ng isang linggo.
01:09Now, what is according to your scale of rainfall,
01:16yung, I don't think, I know DPWH is knowledgeable about this,
01:22yung 600 plus rainfall is equivalent to 100-year return period. Am I right?
01:31Sino makasagot? On record?
01:32Yes, Mr. Chair. Based on the rainfall data that we gathered also from Pag-ASA,
01:44we plotted it against the graph or the rainfall intensity duration frequency curve of that type 1 increasing,
01:52that series of rainfall, and that it exceeded the 100-year return period plot.
01:56100-year return period. Now, my question is,
02:00gaano kalaki ang design ng ating mga drainage system in Metro Manila, internal or main drain?
02:08Ilang return period yun?
02:10Yes, Mr. Chair, since 2005, the DPWH has upgraded its design guidelines and criteria
02:20to account for the climate change, but we could only account for 15 years.
02:27So, previously po, before the climate change events, it's just designed for 10-year return period,
02:33but we upgraded it to 15-year return period plan.
02:36You just can't imagine, Mr. Chairman,
02:38ang buhos ng ulan is 100-year return period,
02:41but the capacities of our drainage system is only 15-year return period.
02:46So, saan papunta ang mga tubig na yan, kundi mag-overflow talaga?
02:52That's one of the problems.
02:53That is why there is a master plan for Metro Manila,
02:56and the recommendation is to upgrade all these drainage systems sa Metro Manila.
03:02Ito ang dahilan kung bakit lagi tayo nagbabaha,
03:05dahil yung mga capacities ng ating mga arteries,
03:08or yung ating mga drains, lateral man, main drains mo natin,
03:12going towards creeks and other outfalls,
03:16and going towards pumping stations,
03:19ay hindi talaga kayang dalhin.
03:22So, because we are now in the 100-year return period,
03:25ibig sabihin ang design,
03:26this is measured in sa design nila kasi return period ang yung basis nila.
03:31So, yun yun ang dahilan, Mr. Chairman.
03:35Okay, we can return to Pagasa, please.
03:37Please wrap up.
03:40Okay, thank you, Mr. Chair.
03:41Just for the record, yung normal natin sa isang taon for the Science Garden is 516 millimeters.
03:53Yun po yung amount, amount.
03:56And also for the record, yung data that we use is from Pagasa, DOST Pagasa po.
04:03It's not from MDA.
04:06Sorry, can you state the data again that you mentioned?
04:08The typical rainfall is what?
04:12Science Garden.
04:16And kindly make a comparison to what has been,
04:19what was the output for July?
04:225164 for July.
04:25That's the normal.
04:26Normal, yun.
04:27The output mo for last month is what?
04:29I have here record of July.
04:42July rainfall is 956 millimeter.
04:46Do you confirm this number, please?
04:50I can confirm lang.
04:50Galing ito kasi sa MMDA, of course.
04:53I think it's for one week, sir, Congressman.
04:55One week lang yun?
04:57Hindi.
04:58Ang one week nila is 600 plus.
05:01Yung kanilang one month is 900 plus.
05:03Meaning, sobra talaga din sa average nyo.
05:07Dahil ang average nyo is 500 lang.
05:09Do you confirm this, please?
05:15Yes, Richard, sir.
05:20Sige po, is Pagasa finished?
05:24Or do you have a wrap-up statement, pa po?
05:28Maybe we can jump to the last slide.
05:32Sige po, please proceed.
05:33Sige po, please.
06:03The forecasting style.
06:06Kasi dito po, it's not what the weather will do, but it will be what the weather can do.
06:15O kung ano yung, kasi magiging, ano na ito, sir, ano yung magiging action ng mga tao based doon sa forecast.
06:23It's not, it's not na sasabihin lang natin na uulan bukas.
06:27So, ang magiging new paradigm ay kung ano ang gagawin dapat ng tao, kung anong mangyayari doon sa community.
06:41Then, number two is the establishment of an EI based.
06:45I think this was discussed earlier by Dr. Paringit.
06:50Then, we have the strengthening capacity of the Republic of the Philippines for disaster risk reduction.
06:56These are the projects of the Pag-asa funded through the Korean government.
07:06At saka marami pa pong mga ibang mga projects listed here.
07:12But I want to emphasize na lang dito sa sinabi ni Dr. Paringit kanina, which is the flood forecasting and warning system or modeling dito sa anim na medyo river basins.
07:24So, dito po sa ginagawa naming project, we will be developing a flood forecasting model, meaning ito po yung gagamitin natin para sa early warning.
07:36Then, aside from that, magkakaroon po tayo ng mga hazard maps or inundation maps, which can be used for planning.
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