Rich, You understand, don't you, that the point you are using to define your 'dam', delineates a watershed; so, there is runoff from the watershed, which will not be uniform in its contribution -- a fundamental issue in hydrology, which is more critical to quantify accurately at smaller spatial scales -- knowing the rainfall rate alone will not give you what you need. You also need to generate a storage-elevation curve, which will relate the water level (which r.lake needs) to the volume behind your dam (assuming none escapes, otherwise the problem gets more complicated) -- the change in volume depends on the inflow rate, which a hydrologic model will provide. Typically, hydrologic models are calibrated against observed flow data. There is the further assumption that the inflow spreads over the lake surface instantaneously, which for a small surface area is not altogether unreasonable...
Tom On Wed, Oct 5, 2016 at 11:48 AM, Rich Shepard <[email protected]> wrote: > I want to ensure my understanding how to use r.lake for my need. > > It would be good to produce animation of flooded area with increasing > precipitation; use of the '-o' option is required. But, perhaps I need to > produce a large series of individual maps. > > Under what condition is use of the '-n' option appropriate? > > If I want a final water_level of 1 m above the elevation of the specified > coordinates in increments of 0.254 mm how can I specify this for the > animation? The manual's description tells me that the 1 m water_level is > the > final height and the elevation of the specified coordinates is the starting > height. How are map-to-map increments specified? A related question is > whether the water level associated with a given map can be produced. That > is, can individual maps in the animation be related to specific water > levels? This quantification of output map and water level above the > starting > elevation is very important. > > All thoughts, suggestions, and pointers to more information are welcome. > > Rich > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
