<html><head></head><body><div>Thank you Anna.</div><div>I will try to attach the two geotiffs in a compressed folder, with the simplest example of a single ditch, for both reservoirs. EPSG:32632.</div><div>The ditch is not exactly the same for the two reservoirs, they change a little bit in the final part of the mouth of the reservoir, but it is very similar.</div><div>Sorry I didn't use a sample vector of points, I did it later with temporal.</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div>r.slope.aspect <a href="mailto:elevation=dem_invaso2_fosso@granello">elevation=dem_invaso2</a> dx=dx_invaso2 dy=dy_invaso2</div></blockquote><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div>r.sim.water -t elevation=dem_invaso2 dx=dx_invaso2 dy=dy_invaso2 rain_value=40 infil_value=24.1 man_value=0.368 depth=water_depth_invaso2_40x30mm discharge=discharge_invaso2_40x30mm niterations=30 --overwrite</div></blockquote><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div>r.slope.aspect<span class="Apple-converted-space"> </span><a href="mailto:elevation=dem_invaso2_fosso@granello" style="color: rgb(46, 52, 54);">elevation=dem_invaso6</a><span class="Apple-converted-space"> </span>dx=dx_invaso6 dy=dy_invaso6</div></blockquote><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div>r.sim.water -t elevation=dem_invaso6 dx=dx_invaso6 dy=dy_invaso6 rain_value=40 infil_value=24.1 man_value=0.368 depth=water_depth_invaso6_40x30mm discharge=discharge_invaso6_40x30mm niterations=30 --overwrite</div></blockquote><div><span><pre><br></pre></span></div><div>Thank you very much</div><div>I am sure there is some mistake on my part!</div><div><br></div><pre style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px; text-decoration: none;">-- <br></pre><pre style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px; text-decoration: none;">--
Perito agrario Enrico Gabrielli
progetto F.A.R.M. <a href="https://www.farm-agroecologia.it">www.farm-agroecologia.it</a>
Tessera n. 633 Collegio Periti agrari prov. Di Modena
Biblioteca agricoltura: <a href="https://www.zotero.org/groups/aplomb/">https://www.zotero.org/groups/aplomb/</a>
<a href="https://www.inaturalist.org/observations/bonushenricus">https://www.inaturalist.org/observations/bonushenricus</a></pre><div><br></div><div>Il giorno mar, 01/08/2023 alle 13.17 -0400, Anna Petrášová ha scritto:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 1, 2023 at 10:23 AM bonushenricus <<a href="mailto:bonushenricus76@gmail.com">bonushenricus76@gmail.com</a>> wrote:<br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div><div>Thank you, Anna.</div><div>r.sim.water finishes the simulation not at the end of the rainfall event, in my case at 30 minutes, but at an earlier time. In my case, in the smaller reservoir at 16 minutes, in the case of the more extensive reservoir at 24 minutes. But the water keeps coming even after that. I imagined that the calculation ends when it reaches the steady state of the water blade.</div><div>But it's not so. Then I don't understand why it ends at 16 or 24 minutes. Doesn't the water continue to arrive after that? Shouldn't it increase?</div><div>I cannot understand it. In the reservoirs, the discharge is very low, as I expect. But if the discharge does not increase and the precipitation continues, I expect the water depth to rise again.</div><div>And it is not understandable that two reservoirs, one twice the volume of the other, contain the same depth of 30 cm at the end of the rainfall.</div><div>To understand how this works, I would apply waterproofing to the reservoirs. The ksat, or infil_value, is the only variable that can explain this: the larger reservoir loses more water.</div><div>If both reservoirs were waterproof, I would have removed this variable. Unfortunately r.sim.water infil=raster where I have marked value 0 in the reservoirs does not work. There is perhaps a bug that I have reported. So I haven't had a chance to test this.</div><div>I don't know how to do it; I can't trust the 30 cm as a value to calculate the water volume in the two reservoirs. I will have to use another model.</div><div>I will try to use a distributed model. Since I have the data in GRASS, I will try using the old geomhydas, hoping the modules will work in GRASS8, and then use the Mhydas models in OpenFluid. I have no other chance unless someone can help me find a solution.</div><div><span></span></div></div><br></blockquote><div><br></div><div>Unfortunately I haven't had time to look at the reported issue. Perhaps you could share your data and provide exact commands and pictures, explaining very clearly what's wrong. </div><div> </div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div><div><span><pre>-- <br></pre><pre>--
Perito agrario Enrico Gabrielli
progetto F.A.R.M. <a href="http://www.farm-agroecologia.it" target="_blank">www.farm-agroecologia.it</a>
Tessera n. 633 Collegio Periti agrari prov. Di Modena
Biblioteca agricoltura: <a href="https://www.zotero.org/groups/aplomb/" target="_blank">https://www.zotero.org/groups/aplomb/</a>
<a href="https://www.inaturalist.org/observations/bonushenricus" target="_blank">https://www.inaturalist.org/observations/bonushenricus</a>
</pre></span></div><div><br></div><div>Il giorno mar, 01/08/2023 alle 09.23 -0400, Anna Petrášová ha scritto:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 31, 2023 at 11:42 PM bonushenricus <<a href="mailto:bonushenricus76@gmail.com" target="_blank">bonushenricus76@gmail.com</a>> wrote:<br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div><div>Hi Anna</div><div>I too immediately thought it was enough to compute it for the final step of the simulation,</div><div>but I noticed that the same slope, same ditches, same rainfall, for two reservoirs at the same location, same length along a contour, but different width and depth, at the final step of the simulation the water depth was always 30 cm, I went to read the article </div><div style="line-height:1.35;margin-left:2em"><div>Mitasova, Helena, Chris Thaxton, Jaroslav Hofierka, Richard McLaughlin, Amber Moore, e Lubos Mitas. «Path Sampling Method for Modeling Overland Water Flow, Sediment Transport, and Short Term Terrain Evolution in Open Source GIS». In <i>Developments in Water Science</i>, 55:1479–90. Elsevier, 2004. <a href="https://doi.org/10.1016/S0167-5648(04)80159-X" target="_blank">https://doi.org/10.1016/S0167-5648(04)80159-X</a></div><div>where I read the Saint-Venant equation. I am an agricultural technician and geographer unfortunately ignorant of hydrological calculations and serious mathematics, and I understood, looking at the equation, that the water depth is the depth of overland flow = rainfall exces - water flow.</div><div>So the final 30 cm should not be understood as accumulated water, but as the blade of water that was added at that precise moment.</div><div>Isn't my interpretation right?</div></div></div><div><br></div></blockquote><div><br></div><div>No, it should be actual water depth. I didn't understand the discrepancy you are describing?<br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div><div style="line-height:1.35;margin-left:2em"> <span title="url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fzotero.org%3A2&rft_id=urn%3Aisbn%3A978-0-444-51840-8&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Path%20sampling%20method%20for%20modeling%20overland%20water%20flow%2C%20sediment%20transport%2C%20and%20short%20term%20terrain%20evolution%20in%20Open%20Source%20GIS&rft.publisher=Elsevier&rft.aufirst=Helena&rft.aulast=Mitasova&rft.au=Helena%20Mitasova&rft.au=Chris%20Thaxton&rft.au=Jaroslav%20Hofierka&rft.au=Richard%20McLaughlin&rft.au=Amber%20Moore&rft.au=Lubos%20Mitas&rft.date=2004&rft.pages=1479-1490&rft.spage=1479&rft.epage=1490&rft.isbn=978-0-444-51840-8&rft.language=en"></span></div><div><span><pre>-- <br></pre></span></div></div></blockquote></div></div></blockquote></div></blockquote></div></div></blockquote></body></html>