@Fish Newb,
Good idea on hiding lighting by using planting box to cover up the whole long cable thing. I must go to the lamp suppliers and see whatever is available and plan further from there.
@CardBoardBoxProcessor,
Yes, Jakarta is not just a city, it is a congested metropolis and it spreads out large area. What it lacks in concentrated high rise is compensated by the sheer size. The monument and park thing you mentioned is around the central area in front of the presidential palace (our "white house") and it explains the green-ness of the area. That big tower thing is the national monument with several hundread pounds of gold carving on top symbolizing neverending flame. Wall to wall building is a good way to illustrate some cramped areas of the city, even though there are many more prestigious spots with much more open space and greenery. I live on the southern part of the city which is richer in greenery and lucky enough to live right next to a park the size of two football fields.
@capricorn77,
We do have mosquito all the time all year long since it is the tropics right here. The possibily of water getting stuck in the nooks and crannies long enough for mosquito to breed does exist. However since mosquito will never lay their eggs on moving water, the pond and all the moving water part are spared. The passive nooks and crannies however, are made in a way that water will never stay there for too long and drains away.
If you take a scross section on the backdrop right by the spots with water flowing:
1. Steel frames with earth, rubble and soil
2. Base concrete layer (water resistant)
3. Outer crust
Base concrete layer which is water resistant will not allow water from backwall watering/waterfall to seep and lost. The outer crust is made in a way that it is light and porous. This way water will not penetrate inside the wall and wet the house structure (or even seep to the other side of the wall). Parts without backwall watering has no layer #2, so basically all water (which is not much) will seeps and drips down either to the pond or to the ground (drainage is already there to handle this).
Algae scraping? that would be as easy as doing an open top tank. The glass is less than 60cm deep anyway so it would be a piece of cake.
Waterfall issue is already prepared by having three valves (one to the pond and two to the backwall) which control the flow of returning water. If it gets too loud or too wet/splashy, the valves are already there, just adjust so more non-waterfall water get more portion.