Goals and Long Term Implications
One of the most important goals of the Rainwater Sequestration project is to answer the question:
Is it possible to sequester in place most, if not all, of the rainwater during the rainy season (July to November)?
The Water Sequestration Ponds (shown with Red arrows in Fig. 01) are among the proposed integrated Water Sequestration, Treatment, Recycling and Conservation projects:
- Water Sequestration Ponds (an overview presented in this article)
- Canals and Local Irrigation System (visit separate article)
- Locks and Organic Dams (visit separate article)
They were designed to ensure that most, if not all, of the rainwater that fall into the Eugenio-Magano Cadu Farms are collected in place, with enough room to spare to accommodate even larger volumes of rainwater during the advent of La Nina, or the high intensity torrential rain during the height of a typhoon and storm.
Not included (or not so apparent) in the schematic map (Figs. 01 and 03), are related Water Sequestration, Treatment, Recycling and Conservation projects:
- Kahon-kahon (visit separate article)
- Micro-irrigation system (visit separate article)
- Evapo-transpiration minimization (visit separate article)
- Sub-surface (underground) water storage (visit separate article)
to enhance further the ability of the land areas in Cadu Farm 03 to store in place as much, if not all, of the rainwater during the rainy season -- for use later during the dry season; and, especially during the occurrence of El Nino when prolonged dry season and drought occur for a period between several months to as long as two years.
Water Sequestration. The most pressing goal in constructing the water sequestration ponds is to collect as much, if not all, of the rainwater during the rainy season (July to November), store the collected rainwater in place in the farm (including long term subsurface storage) to ensure that there is adequate water available during the long dry season (January to May).
El Nino - La Nina. Rainwater sequestration is even more critical especially during the advent of El Nino when there is prolonged dry season and subsequent drought that could last for several months or up to two years (from historical records).
The advent of La Nina, the opposite of El Nino, augurs prolonged and high intensity rain that may trigger flash floods, potential hazards of massive land slides and soil erosion. Rainwater sequestration is just as important during La Nina to ensure more rainwater becomes available for subsurface water sequestration. The latter will ensure tapping of subsurface water reservoirs (as a last resort) during prolonged drought encountered as a result of a long duration El Nino. However, this strategy of tapping subsurface reservoirs will work for the long term only if there is judicious and regular re-charge of subsurface water reservoirs .
Climate Change and Global Warming. Rainwater sequestration has been practiced for thousands of years, especially in arid regions where the annual precipitation is very low . Rainwater sequestration is getting more attention also even in tropical countries, like the Philippines, not only because of the impact of El Nino but also because of Climate Change and Global Warming that can significantly impact water availability.
Flash Flood Impact Mitigation. Other than the impact of the strong winds, the most destructive effect of a typhoon (or a storm) is the rampaging impacts of converging rainwater coalescing very rapidly and in high volume from various sources and locations -- denuded forests and hills, as well as unprotected flat regions of farms, pasturelands and even human habitats. The destructive converging rainwater scours the surface of the steep land creating deep gullies in denuded mountains and hills, eroding steep river banks, creeks and streams and serious soil erosion even in flat lands.
The key to solving the destructive impact of flash flood is san understanding the characteristic of a typhoon or a storm -- more often than not, a storm or typhoon, stays in place for about a day or two.
Integrated Schematic Map of Cadu Farms 01 to Farm 03
The Water Sequestration, Treatment, Recycling and Conservation projects are among the foundation projects of the EcoCulture System to create a biodiverse and sustainable food production EcoCulture system.