rolling stones vs. soil erosion

Rolling Stones vs. Soil Erosion

Bienvenido “Nonoy” Oplas, Jr.

Millora Farms

Bugallon, Pangasinan

WASWAC-BSWM Seminar on Soil Management Bureau of Soil and Water Management, DA, Quezon City May 12, 2014

Outline 1.The Farm, Pangasinan 2.The Rolling Stones 3.Old Terraces 4.Various Terraces 5.Pool in the Creek 6.Treehouse 7.Irrigation and Ricefields 8.Concluding Notes

1. The Farm, Location • Brgy. Laguit Padilla, Bugallon,

Pangasinan • About 7 kms. From the highway in

Bugallon, which is 198 kms. From Manila

• Midland to upland farm; main crops are mangos and forest trees

2. The Rolling Stones

• Not Mick Jagger and his rock band • Though being a rock fan, I like their

name and songs • But stones, big and small, in the nearby

creek in the farm

3. Old Terraces, 2004-2005

• Built after the bigger treehouse was finished in March 2004

• Mahogany trees then were still small. We started planting a few trees in 1992

• The stones were gathered manually from a nearby creek.

4. Various Terraces

• Mostly around the treehouse, left, back, right.

• Stabilized and enriched the soil, reduced flash flood, strengthened the trees, help beautify the place

• At times though, the stones become hiding place of some crawlers: small snakes, reptiles, soil spider.

Near decomposing dried leaves in danger of being washed by flash flood (top left), collected and cleared (above), and put in an expanded terrace (left) with old deposit of organic materials. Average Height about 0.5 meter, Length about 5 meters, Width about 2.5 meters. Volume = H x L x W = 6.25 cubic meters.

Under the treehouse. Old formation, about 5 years ago. This has been damaged by a strong flash flood in recent years.

• Totally blocking a small water pathway with lots of stones, big and small.

• Dried leaves, pruned branches and some wild but inferior vegetation, were deposited at the back to decompose and become soil

• The stone formation in the front has evolved (next slide).

• Back of this stone structure has become a mini-pond during the rainy season.

• Trapped lots of top soil, mud and organic matter. It is becoming thicker and higher.

How much trapped soil so far? Last March, we measured about 5 meters from the 3rd row of stones: about 1 foot deep. about 6 feet wide = 6 sq. ft from that distance. It’s deeper than 1 ft near the stones, shallower from this spot. Dried leaves cover not included in this depth, only the trapped soil.

• How tall is this rock structure, our respective height would show. Should be at least 6 feet high.

• Full time caretaker Nong Endring Paragas (right), and his son Danny Paragas (below), part time

5. Pool in the Creek

• Built in late 2005; no cement, only big and small stones gathered to impound free-flowing water

• Visited by many friends from Manila and abroad.

• Short-lived, from October 2005 to May 2006. By June, flash flood started destroying the stones.

6. Treehouse * 2002 vs. 2014 versions

7. Irrigation and ricefields

• Impounding the upper creek with stones, sandbags and cogon. Very effective. The cogon is alive, expanding its roots

• Diverted water goes to the nearby ricefield in front of the treehouse.

• Old, cemented, mini-dam and water impounding structure. Water is diverted to the next field across the creek

• Strong flash floods have damaged and removed the big rocks supporting this mini dam.

• Ricefield across the creek that benefit from the diverted water of the mini-dam.

• There is spring water that develops above this area during the rainy season.

• For now the field is idle. Our caretaker is old enough to till this wide area.

8. Concluding Notes

• Building stone terraces has been very useful for us in the farm. They performed 3 basic functions: (1) control soil erosion, (2) reduced flash flood, the trapped organic matter and topsoil have become natural “sponge” that absorbed lots of rainwater; and (3) helped beautify the place.

• Pure human labor, no cement, no machineries, no government funds or subsidies were used. Revenues from selling some trees/lumber, charcoal, help fund the labor cost to build and expand the terraces, repair the treehouse.

• Thanks to our caretaker and extra workers (hired only when funds would allow)

• Finally, thanks to Dr. Samran Sombatpanit, Past President, World Association for Soil and Water Conservation (WASWAC) for inviting me to present in this unique seminar at the BSWM.

• Read more about the farm, http://sustaindevelopment.blogspot.com/

• Nonoy Oplas, noysky_oplasky@yahoo.com