[talk-ph] Waterways in NCR and surrounding provinces

[tutubi]

exactly my thoughts too

it's called tidal estuary

many boundaries in metro manila defined by rivers and (vanishing) esteros


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On Sep 12, 2013, at 10:22 AM, rem zamora <pompyang at gmail.com> wrote:

> Good idea Jim.
> 
> However it got me thinking also... in the case of Pasig river, the flow of the water depends on the time and tide of the day. Sometimes water flows inward from the bay to Laguna lake but there are times also that the water flows from the lake to the ocean (which is what seems to be natural to me, all water flows toward the ocean).
> 
> Just a thought. This is the same case also in Malabon and some parts of Bulacan also :)
> 
> On Sep 12, 2013 9:42 AM, "Jim Morgan" <jim at datalude.com> wrote:
>> On Thursday, 12 September, 2013 09:31 AM, maning sambale wrote:
>>> In some cases, we had to switch the way direction to follow the the
>>> convention [0] that the "direction of the way should be downstream
>> Hah, I'd never really thought of this before. I guess a lot of times I start tracing from the sea backwards inland, so I've probably got this wrong a few times.
>> 
>> It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically.
>> 
>> So what about canals? :-)
>> 
>> Jim
>> 
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