Wow , i should definitely consider using that watershed area. What angle is ideal for that Tums? I mean i guess having sediment in your pond is not a desirable thing. Is it? How to control that?
And i have 1 doubt in my mind: The soil of my city drains water perfectly. And i think maybe the water that falls on the ground will be sucked by the water and not be conveyed to my lake. What do you think?
The angle depends on what material or vegatation is present that would make sediment movement less of an issue. Sediment will fill in your pond decreasing the depth in the form of silt. Even when your soil pretty much takes up the rain that falls you can design features that will put runoff into you pond. Say for instance you build a covered area for celebrations the water from the roof could be diverted into piping off the roof and into the pond. In areas with less rainfall I encourage people to use their imagination about how to divert water for useful purposes. If you know rain is coming and just simply lay out a roll of plastic next to the pond nearly all of the water that hits the plastic will go into the pond. I learned alot of how to think differently about how to get useful water when I spent time in a area that got less than 6.5" (165 MM) of annual rainfall.
