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Text of the page (random words):
nct i decided to add a section with the title what can i do hopefully this will inspire people to take action i hope this has the right tone while the situation for many species is dire and they face many threats there is much that can be done and we can t give in to despair let me know what you think what do you notice in your watershed how do you think this information could be used please don t hesitate to be in touch to share your thoughts posted in uncategorized ai generated podcast about the global watersheds app posted on december 1 2025 by mheberger i first heard about ai generated podcasts about a year ago i have pretty mixed feelings about them i d rather listen to real human hosts with a passion for their subject but i also read that graduate students were using them to summarize papers and listening to them while doing the dishes or on a walk knowing how impossible it is to keep up with the latest developments in science i was intrigued by this so i gave it a try using google s notebooklm i uploaded a handful of papers i wanted to read and created a podcast episode the results were fairly mixed with technical papers i didn t feel like i gained much insight or understanding the ai hosts engaged in a lot of puffery they tend to exaggerate the significance or importance of things everything is a big deal and a game changer still it was interesting i ve long wished there was a podcast where the host would geek out on the latest research in hydrology and earth science i m left thinking there s real potential here but it will require more human in the loop creation process where a person with knowledge and interest curates and edits the discussion that might help the ai hone in on the more interesting or innovative aspects of a paper or to reign in some of ai s worst impulses like repeating the phrases deep dive or delve into on a whim i decided to create an ai podcast about my global watersheds web app i uploaded the app s help about page to notebook lm and asked it to create an audio overview it is actually pretty good i m not sure how useful it is though to listen to people talking about software in this case it seems like a video would be more instructive the thing that is really uncanny about this is the emotion and realism of the ai voices the ai hosts seem genuinely interested in the subject there is something deeply flattering listening to two people discuss something you wrote and say how great it is on a second whim i asked notebook lm to create an infographic it s also not terrible i m actually a little jealous of how colorful and interesting it looks compared to some conference posters i ve made posted in uncategorized please limit your global watershed api usage rate posted on november 26 2025 by mheberger the api for watershed and flowpath delineation has gotten popular last month users made nearly 4 000 requests every day unfortunately increased traffic can lead to lagging response and errors if the situation continues i may add throttling to limit the number of requests based on your ip address so a request to all api users please space out your requests and avoid making asynchronous requests you can do this by adding a pause of 5 seconds between requests spacing out your requests will protect against accidental overload and ensure the service remains responsive for everyone the app is hosted on a shared web server i love my host opalstack but i m also not in a position to upgrade my hosting plan as it would cost quite a bit more than the 25 per month that i m currently paying if you want to help keep the site free for everyone you can always support the site via buy me a coffee posted in uncategorized new features on global watersheds river profiles elevation and grace map layer posted on august 29 2025 by mheberger to my fellow watershed explorers i m excited to share a couple of new features i ve been working on for the global watersheds web app flowpath profiles under options check the box show flowpath profile plot now create a new flowpath on the map you should get an interactive plot of the river s distance vs elevation hover over the river or the profile to highlight a river reach on the map and the plot a few notes about the profile plot first it s only available when you use merit hydro as your data source and not hydrosheds or usgs also the plot will only include the portions of rivers that are mapped in the merit basins dataset in higher precision mode your flowpath starts right at the point you clicked and maps the flow over land and through small channels and creeks it is possible to calculate the elevation profile of the overland flowpath but for global coverage i would have to put over 50gb of raster elevation datasets on my web server which is beyond my current allotment unless i pay for more disk space calculating river lengths is a tricky business the distances reported here are probably a little smaller than the truth this has to do with the way that river flowlines have been digitized from gridded data and do not always capture all the curves and meanders of real life rivers longest river and elevation plots on the watershed data report after you ve delineated a watershed you have the option to create a watershed data report that summarizes various scientific and socioeconomic data within your watershed s boundaries now there is a new feature that shows you the longest river in the watershed it is not always the one you expect in this example if you trace the source of the ganges bramaputra rivers it will lead you up a curvy path into himalayas in tibet to a mountain river called the dangar chu and to a lake called dzanangting tso this is only a few kilometers from the traditional source of the river at chemayungdung glacier however if you try the mississippi river basin you may be surprised that it does not follow its namesake river but instead follows the missouri river upstream all the way to montana elevation plots under the heading topography the report also shows some statistics related to watershed elevations and a histogram of elevations it the watershed this was something a few users emailed me to ask for is this interesting to most folks i m not sure but i m happy with the way it came out mapping watershed trends with grace i ve been wanting to add a map layer using grace data because i think it s incredibly cool and can tell us a lot about what is going on with water cycle the grace satellites give us extraordinary insight into changes in terrestrial water storage i ve created a new map layer that shows the trend in terrestrial water storage between 2002 and 2025 the grace satellites make highly accurate measurements of the earth s gravitational field and provide measurements of changes in the mass of water on a monthly time scale these measurements do not tell us how much water there is in a region but rather how the amount of water has changed compared to a historical baseline the measurement includes all forms of water including rivers lakes reservoirs soil moisture groundwater glaciers snow and ice for a longer introduction to grace see this section 1 2 3 of my phd thesis under the heading remote sensing of the water cycle i obtained grace data from the center for space research at university of texas austin download link for this map layer i have calculated the linear trend in every 0 25 pixel in the global dataset trends are based on observations of the total water storage anomaly from april 2002 to april 2025 i used matlab and the climate data toolbox and i m happy to share the code to repeat these calculations to anyone interested i am basically repeating the analysis in a 2018 paper by nasa scientists in the journal nature emerging trends in global freshwater availability it is interesting to compare how the trend as of 2016 compare to those today annotated map of terrestrial water storage trends figure 1 in rodell et al 2018 upgrades to the report and share pages i also refactored the way that the report works you can now link directly to reports this means you can share them with friends family and colleagues for example here is the report for the amazon river one of the most frequently requested watersheds on the app https mghydro com app report lat 0 439 lng 50 738 you may also notice a small difference in the shared watershed pages with shorter urls and a button to open a watershed data report on every share page let me know what you think about these new features and if you see any bugs or have any suggestions let me know matt posted in uncategorized python script for watershed delineation with the usgs nldi api posted on june 27 2025 by mheberger in november 2022 i posted a tutorial on how to use the us geological survey s web service nldi to delineated watersheds in the continental united states since then they updated the api and that old code no longer works here is an updated python script i m using the library pynhd which gives convenient access to the nldi you could also use the api directly with the requests library this nldi gives access to data from the national hydrography dataset plus version 2 this is an older version of the nhd that is no longer being updated at this time the usgs does not have an api to access the latest version of its geodata the 3dhp so if you wanted to use those data for watershed delineation i suppose you would have to download the data and use gis or write your own routines let me know what you think would you be interested in a python package that you could install with pip what kind of output is most useful download the script here https gist github com mheberger 9b99aa7c185bbb070c9eff7f8e497091 posted in uncategorized global watersheds updated with usgs data and methods posted on june 27 2025 by mheberger now the global watersheds web app can use usgs data and methods nldi to delineate watersheds in the continental united states this means more accurate watersheds and flow paths in the us to access it make sure to do a full reload of the page https mghydro com watersheds in most browsers you can hit ctrl shift r or ctrl f5 to use the usgs option click on options then under data source select usgs here the app is using a free api from the usgs called the hydro network linked data index or nldi this option was available a couple of years ago but at one point the usgs updated their api and it broke my code it took me a while to get around to fixing it a few notes sometimes the usgs api will time out without returning results i ve set up the app to automatically retry 3 times but if you get an error message please wait a moment and try again you can also try clicking on a slightly different point like 0 001 from your original request be patient their server can take a few minutes sometimes i ve also added another feature that should help you to get good results the nhdv2 flowlines layer on the map the national hydrography dataset version 2 is the dataset used by usgs for the nldi in the map layer selector at the upper right choose this layer at the bottom of the list see image below to get good watershed delineation results click on the flowline for the river whose watershed you are seeking this will help snap the pour point correctly this should help reduce the spurious small tributary watersheds that often come up more about the national hydrography dataset the nhd is the nation s water data backbone and gives access to geodata that has been compiled by state and federal agencies over the course of decades unfortunately the version used by the nldi is not the latest hydrography dataset created by the usgs the naming of the different versions of the nhd is confusing but as best as i can tell the nldi is based on nhd v2 this version was released in 2012 and was digitized from maps at the 1 100 000 scale there is a later version called nhdplus hr for high resolution which was never quite completed for the whole nation as of 2023 this is no longer being developed and the usgs is now focused on creating a hydrography data product called 3dhp there is not yet an api to access these datasets but they are available for download one quirky thing about the nhd is that it is only for the continental united states affectionately referred to as conus so you will see missing data around the border with mexico and canada for example here is the watershed of the tijuana river the watershed boundaries are complete but most of the rivers in mexico are missing let me know how this new feature works for you i always like hearing from folks using the app if you found the app helpful consider supporting the site by buying me a coffee ️ posted in uncategorized original source for the budyko framework free pdf download posted on january 21 2025 by mheberger if you ve studied hydrology or climate science you ve probably come across the budyko curve or the budyko framework soviet climatologist mikhail ivanovich budyko published what is now the well known budyko curve a conceptual model describing the relationship between the water and energy balances of a catchment or region it has been hotly debated for decades and scientists still write hundreds of papers about it every year i was curious about the original source for this some sources report it as budyko s book water for life published by unesco in 1974 however the original publication predates this by almost 20 years and i was surprised to find it of all places on the website of the cia i cleaned up the pdf by cropping the pages running character recognition and compressing the images you ll find the famous budyko curve at the top of page 74 in the book page x in the pdf budyko 1956 download citation budyko m i 1956 teplovoĭ balans zemnoĭ poverkhnosti heat balance of the earth s surface gidrometeorologischeskoe izdatel stvo hydrometeorological publishing house leningrad ussr translated by n a stepanova u s weather bureau 1958 259 pages if you enjoyed adding this classic to your library consider buying me a coffee posted in uncategorized global watersheds gets a major update posted on november 4 2024 by mheberger i ve just published a bunch of updates to the free global watersheds web app please check them out and as always let me know if you have any questions or comments i always love hearing from folks who use the app new thematic map layers did you know you can change the basemap shown on the map by clicking the layer selector at the top right i ve added three new thematic map layers population density land cover and irrigated lands these layers help illustrate human activities that can have big impacts on watersheds i chose to use a datalayer of population called globpop by researchers in beijing this seemed to be the best among the alternatives i looked at gpw4 grump landscan and worldpop this was actually quite surprising as some of these other datasets are well known and backed by large institutions three new thematic map layers population density is shown here the thema...