Cuenca del estanque de retención

Question

<\/HEAD>Hola,<\/P> <\/P> Soy nueva usando la herramienta watershed. Veo que puedes usar y\/o crear puntos de vertido para ubicaciones de estaciones de aforo, etc... ¿Qué pasa si estoy tratando de descubrir la cuenca para un estanque en tierras altas que es un polígono y no un punto...? ¿Debería buscar un punto de vertido a lo largo del estanque o hay alguna manera de usar el área del polígono del estanque para encontrar la cuenca? Preguntaré secundariamente, si hago un relleno en el DEM, ¿llenará mi estanque de retención?<\/P> <\/P> Gracias,<\/P> <\/P> Jessica <\/P><\/BODY><\/HTML>

GabrielUpchurch1 · Answer

For the pour points, I would test Sephe's suggestion first to see what you get but I suspect you may get watersheds for each cell in the pond.  I haven't tested this approach so it would be beneficial for you to try it.  Even if you get a bunch of small watersheds, you could post process the data into a single watershed for the whole pond.  Alternatively, if the pond has an outlet, dam, levee, spillway, etc., you could place a point there or if all land around the pond drains into the pond, you could use the pond's centroid.  General knowledge of the slope of the terrain and hydrology for the area will play into where you place a point.

As Sephe pointed out, you will need to experiment with the z limit parameter to avoid having your pond filled.

SepheFox · Answer

Hi Jessica, to answer your second question, you can set a z limit for your fill, such that it won't fill your pond. You can try to figure out what that is, or just play around with the z limit until you fill surrounding sinks, but not your pond. As far as the pour point, you might try converting your pond polygon to a raster, so that all the cells of the pond will be used to find the contributing watershed area.