HOW TO MINIMIZE FLOODING IN CENTRAL LUZON AND THE MARIKINA VALLEY AND METRO MANILA

August 21st, 2013 7 Comments   Posted in Dam water release

HOW TO MINIMIZE FLOODING IN CENTRAL LUZON AND THE MARIKINA VALLEY AND METRO MANILA

The San Roque Dam was designed for a 50-year return flood frequency. Since Typhoon Ondoy and Peping were of the order to a 75-100 year flood, it is thus imperative to lower the dam rule curve by 4-5 meters which is the equivalent of 1 major storm. Please note that it took 6 typhoons to fill up the San Roque Dam to its operating level to provide both power and irrigation during summer. More »

Causes of Metro Manila and Luzon Floodings

August 16th, 2012 2 Comments   Posted in Dam water release
Causes of Metro Manila and Luzon Floodings
 
This is happening because of wrong priority, mismanagement and wrong understanding of the purpose of a dam (priority objective is not power generation nor irrigation but flood control and attenuation – store water and release only in controlled amounts to minimize downstream flooding): More »

Pre-emptive Discharge of Dam Water – A must even in TVA

December 10th, 2011 No Comments   Posted in Dam water release

TVA opens spill gates of all nine dams in Tennessee River system

(from Dec 8 – McClatchy-Tribune Regional News – Suzanna McCloskey The Knoxville News-Sentinel, Tenn.)

 

 The author of this blog is gratified to know that even the renowed US TVA practices pre-emptive discharge of excess dam water in order to provide sufficent ulage to contain an incoming storm or exceptional rainfall or run-off arising from non-absorptive capability of vegetation during certain periods of the year, thus avoiding the need for catastrophic releases of excess dam water during peak rainfall and run-off. More »

Need to lower the Dam Rule Curve to allow for at least ullage for 1-2 storms

September 29th, 2011 1 Comment   Posted in Dam water release
 
With the series of storms battering the Philippines, it is now necessary to do pre-emptive discharge of excess dam water in order to avoid catastrophic release from dams equipped with spillways, as against the over-flow dams which have no control. More »