The Circulo Verde river wall is designed to improve the flow of Marikina River and mitigate flooding in Marikina City.

3. Denuded Marikina Watershed In the absence of enough trees,
Eroded soil, garbage and mass
soil is easily eroded in
from upstream become silt
downstream areas.
(burak) and causes obstruction
of the river flow. (Siltation)

4. Siltation causes the river to become shallow,
thereby reducing its carrying capacity.
Left: Photo showing a man walking across a
shallow Marikina River.

5. A shallow river has less carrying capacity and therefore does not allow water
to flow easily. This is siltation.
Siltation then causes water to spill over to unprotected property, and at the
same time, restricts water passage.

7. Siltation happens at
various points in the
river, even beyond the
Manggahan Floodgate.

8. Enlarged view of heavily silted areas near the Manggahan floodgate.

9. PTS. 1 TO 6
Aerial photo showing Circulo Verde
perimeter line. Anything beyond the
PT. 14
black line / white flags is silt.
KEYPLAN
PT.15
PTS. 6 TO 14
Aerial photo showing our boundary limits

11. Contributing to siltation is human factors
such as household waste from informal
settlers who live along the river.
Left: Photo of informal settlers along the
Marikina River.
Source (Aggregator site): 7 Ondoy cities unite to protect watershed.
http://article.wn.com/view/2011/03/19/7_Ondoy_cities_unite_to_protect_marikina_watershed/

12. CIRCULO VERDE LOT
Silt along the river banks in the absence of a
retaining wall.

13. CIRCULO VERDE LOT
Absence of silt after part of the wall has been
put up.
N

14. Ortigas is investing a total of P300-million for the development of the
perimeter retaining wall and the dredging to follow.

15. • 8 meters high
• 1.5 kilometers long
Left: Photo of the Marikina River
that is protected from erosion
thanks to the river wall.

16. Aerial view of the Circulo Verde site with the river wall in
place. Accumulated silt is no longer visible.

17. And the development continues to other parts of the site…

18. More silt to be removed and
more areas to be covered by
the wall.

19. More areas to be covered by
the wall. After which,
dredging will follow.

20. • Ortigas has acquired all the permits for the development of Circulo Verde
and the perimeter wall.
• It has master-planned Circulo Verde with engineering, hydraulics, and
architectural experts to work with and around nature.
• It has invested P300-million to put up a 1.5 kilometer wall to keep soil from
eroding along the banks and pave the way for effective dredging.

21. As a responsible developer with over 81 years of experience in real estate
development, Ortigas & Co. has master-planned Circulo Verde to work with
and around nature and ensure the safety of its residents and neighboring
communities.

23. There is a constant change in land configuration due to flowing water as
seen in the maps from 1904 until 2010. Over time, water has eaten away
parts of the Circulo Verde property.

24. Original OCLP Property Line since 1904
Alignment of Constructed Riverwall (OCLP)
- Length +/- 172 M
Proposed Alignment of Riverwall
for Construction (OCLP) – Length +/- 832 M

25. The construction of the river wall will stop further erosion, widen the
silted river, and increase the river’s carrying capacity.
The construction of the wall was validated by the studies conducted
by DCCD Engineering and Dr. Guillermo Tabios of the National
Hydraulic Research Center of the University of the Philippines.

26. • Ortigas has acquired all the permits for the development of Circulo Verde
and the perimeter wall.
• It has master-planned Circulo Verde with engineering, hydraulics, and
architectural experts to work with and around nature.
• It has invested P300-million to put up a 1.5 kilometer wall to keep soil from
eroding along the banks and pave the way for effective dredging.

27. As a responsible developer with over 81 years of experience in real estate
development, Ortigas & Co. has master-planned Circulo Verde to work with
and around nature and ensure the safety of its residents and neighboring
communities.