/r/Hydrology

Photograph via snooOG

The Hydrology Reddit

Hydrology is the study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability. A practitioner of hydrology is a hydrologist, working within the fields of earth or environmental science, physical geography, geology or civil and environmental engineering.

Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage basin management and water quality, where water plays the central role. Oceanography and meteorology are not included because water is only one of many important aspects within those fields.

Hydrological research can inform environmental engineering, policy and planning. The term hydrology is from Greek: ὕδωρ, hydōr, "water"; and λόγος, logos, "study".

Wikipedia: hydrology


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/r/Hydrology

9,554 Subscribers

1

What kind of job should I look for if I want to work with rivers?

I live next to the Kaw/Kansas River and I always loved the science and beauty of its muddy mess. Unfortunately there’s this company in my town that’s been polluting the water with its phosphorus wastewater. It’s technically legal for them to do this since their wastewater is under the legal amount for 2024, but in 2028 it won’t be. I want to maybe someday try to help protect it or at least work with the river in a non-environmental dangerous way. I really love geology so I think this would be a good focus. I don’t mind getting into engineering either

0 Comments
2024/06/30
14:38 UTC

2

Best use of self-directed professional development time?

Hello r/hydrology! Looking for career advice. I am a hydrologist (45F) with about 20 years' experience, mostly in land management and environmental consulting. As it turns out, I haven't had much practice in that time with HEC-RAS, although I am very interested in flood modeling and H&H. I did have some experience with it in grad school, but that's a while ago now.

Is it worth my time to self-study outside of work to get to, say, an intermediate level of fluency with RAS, or should I focus my efforts on other areas of equal interest, such as learning R or python? Maybe something completely different?

Thanks

Edit: goal is to add skills to expand career options and marketability

4 Comments
2024/06/30
03:50 UTC

5

Which under grad suits the field of hydrology best?

Water Resources or Environmental engineering. I have the option to do either and was wondering. The water resources program has a bunch of geology, hydrology, up to Calc 2, Environmental resource engineering is abet accredited with some elements tied into hydrology? Which would help me break into the field sooner? Suny Brockport water resources bs or Suny ESF Environmental resource engineering?

8 Comments
2024/06/29
01:47 UTC

4

Best cheapest way to find current topography maps?

Just starting to learn about permaculture and want to take an example property and practice design it to learn better. Trying to find usable topography maps for free or cheap to help identify water runoff and breaks in slope. I found some at ngmdb.usgs.gov but either it is next to impossible to find landmarks on these things that are still around today to even identify where you are looking OR i am MISSING something about how to use them :/ Please help! :)

15 Comments
2024/06/28
22:10 UTC

3

Over what distance would precipitation measurements be the same during a hurricane? (geography included in the description)

I need to determine whether roughly 20 minutes of torrential rainfall during hurricane Irene was the same in two different areas. One was Newark, NJ. The other was roughly 12 miles west of Newark.

To be concise, if it was raining extremely hard in Newark for 20 minutes during a hurricane, can we assume it was raining similarly hard 12 miles west (in NJ)?

Also, if anyone has advice on where I might be able to look for the answer, I would seriously appreciate it. I'm trying to help out a friend and can't figure this out.

7 Comments
2024/06/27
01:44 UTC

3

Land Dev Civil Eng. - Interested in the Hydrology

Hi all. Me and my father have a very small (me, him, and some subs) CE company focused on land development (the typical residentials and commercial). I started in construction and naturally worked myself up to working in an Engineering role. The thing is, I rarely do any real Engineering work, and my daily is more focused around running the business (conceptual layouts, proposals, meeting with clients/city/county, due-diligence, putting out fires). I realize that's where everyone eventually ends up, but that's where I started and currently where I still am. I do really like running the business and enjoy the aspects of land development, but I'm getting worn out due to the high level of stress, long hours (60-70 hrs), and lack of technical aspects. I absolutely hate doing conceptual layouts, as they require a level of creativity, and I have absolutely none. I'm a very analytical/technical person, and I enjoy having to think outside of the box or find more efficient ways to solve problems. If something doesn't necessarily require a formula to figure out, I'll still figure out a way to get excel to solve it for me. I've become one of the better large commercial septic designers in the DFW area, and that's the reason I love septic design so much - almost the entirety of it can be broken down into numbers and formulas.

I did a decent amount of programming in my early to mid 20's and absolutely loved it, and to this day I would say I probably should have switched to CS, but I didn't. At the time, I would say I was advanced-beginner to intermediate level. I did a full summer of learning web dev, game dev, etc. I also enjoy variability, having everyday be different and throwing new and unique challenges at me that I need to solve, it's what keeps me excited and engaged. It doesn't always have to be technical/analytical, I enjoy a mix of both. I also live pretty deep in the country, and being able to work from home is almost a must for me. Anyways, I started googling around seeing if there were any CE related jobs that I could hopefully relate my experience to that had elements of programming, modeling, analysis, etc. That's what led me here! Anyways, I'm 31 now, and I don't want to look back 20 years later and regret not moving to a different role, but this would be an absolutely massive change in my life and would take a while to set up. I'm just wanting to get y'alls opinions on if any of my experience applies, my realistic chances of moving into the field, if my interests really do apply here, etc. Appreciate any opinions y'all may have.

4 Comments
2024/06/26
13:45 UTC

17

I'm not sure if testing water samples qualifies me

1 Comment
2024/06/25
15:26 UTC

2

Streambed sediment coring - DIY piston sampler

Curious if anyone has been able to jury-rig their own piston corer or other in-situ sediment sampler (Like this or this). I need to take sediment samples (> 2 mbgs in some locations) in an unlined stormwater/irrigation ditch. There's no where near me that rents piston samplers or any appropriate corer for wet sediment except a van veen, which won't work as one of the questioned we need to answer is thickness of the sediment.

We have larger hand augers but they won't work for this job. In theory we could hammer pipe into the ground and hope for the best but I think the sample would fall out of the bottom. We can alter or build something in house if it's simple-ish and no parts need special ordered. Any solutions? I'm in Australia if that helps.

10 Comments
2024/06/25
05:09 UTC

1

Question about flooding

I have a quick question when it comes to the Missouri River and where it meets the Platte River if someone might be able to answer it for me? It’s about flooding!

5 Comments
2024/06/24
14:38 UTC

2

Ocean Current Simulation-The Meeting Nodes of Land and Open Boundary at Right Corner Blow Up

Hello,

I am currently working on ocean current simulation in Binuangeun Waters, South Java, Indonesia using MIKE21. The lenght x height of the domain is 370 km x 245 km the bathymetry is quiet steep (>6000 m) due to the Java Trench. Simulation period is 30 days in September 2020 with tide form MIKE Global Tide Database 0.125x0.125 as the input.

At the beginning the simulation blow up after 3 days simulation with Elevation too Large caution. It is located at the top right corner which is the meething node of Land and Open Boundary. I was trying to solve it by changing the bathymetry (this area is far from my area of interest) due to bathymetry at nodes in one element could be 15 m-60m-400m. There was a small progress but blow up still happens. I keep changing the bathymetry at the top right corner in order to make it change gradually. The running was success, theres is no error in surface elevation spatially and temporally, yet the current speed value at the top right corner area seems higher than others, and it keep increasing until the end of simulation.

https://preview.redd.it/zwkggjx3fc8d1.png?width=1060&format=png&auto=webp&s=20f67dcd7cf42f041571ae9631297d97702180fa

With the bathymetry that i've changed, i also trying to expand my domain. Already changed the boundary from rectanguler to rounded, and trying to change the mesh manually using "mesh editing". But the current speed at the top right corner still increasing until the end of simulation. At first, i think the problem was in the bathymetry, but now iam not so sure since i change the bathymetry gradually and the currend speed value still bad.

https://preview.redd.it/r6yy50v5fc8d1.png?width=1069&format=png&auto=webp&s=675f5784fed728b16c544d08c2d78eabb507813b

What do you think the problem is? I am seeking for every solution that might help?

Thank you.

0 Comments
2024/06/23
15:56 UTC

1

HYDRUS 1D - Skaggs et al 1970 problem

I am trying to solve the Skaggs et at 1970 problem (infiltration through a homogeneous soil column) with Hydrus 1D but so far I am not able to replicate the results. I think the problem might be with the van Genuchten parameters. Can anyone give me the correct parameters to simulate this? Also, do you guys when simulating use No Hystersis?

0 Comments
2024/06/22
10:12 UTC

4

Unable to add Boundary Condition in HEC-RAS Water Quality Model

Hello there, I am having trouble adding Boundary Condition(BC) in my water quality model. Seems like HEC-RAS only add BC for upstream(CH 5800) and downstream. When I want to add a BC for CH 5750, a "?" appears (as in the red circle in the image) and HEC-RAS just would not process that data I enter. I have asked some people, they mentioned because I do not have hydraulic BC, I am not sure where can I add such BC. Can anyone here provide some tips on how to solve this issues? Thank you in advance.

4 Comments
2024/06/19
12:55 UTC

9

PSA on RASMapper Calculated Layers

Specifically regarding the boilerplate code generated with the Compare WSE option:

The default logic sets you up to colorize the area where one water surface (say, existing) extends, but the other surface (say, proposed) does not.

If you show this to anybody, they'll look at the spots where terrains changed and potentially freak out because they see impact where non exists.

So change the code to

If WSE1 = NoData Then WSE1 = WSE2

If WSE2 = NoData Then WSE2 = TERRAIN

assuming WSE1 is proposed and WSE2 is existing

0 Comments
2024/06/18
18:20 UTC

2

Hello, can anyone who has studied at CU Boulder answer some questions for me?

2 Comments
2024/06/17
21:52 UTC

5

I’m a student and i need advice!

Hey! Currently an undergrad at Stony Brook and I recently found out about hydrology as a career. My main passion in life is marine biology but i dislike the lack of financial stability that comes with it. Would you guys consider hydrology to be something that marries financial stability with marine sciences? If not, can you guys recommend me any paths to go down? Also, do you need a masters to be a hydrologist? What kinda of degrees do you have? I’m an environmental studies major as well, wondering if this is a good major for hydrology? I’d also appreciate if someone could tell me their job responsibilities and pros/cons of the work they do!

Thank you very much! :)

13 Comments
2024/06/16
21:56 UTC

2

[FEFLOW]

Hi, is there anyone working on FEFLOW? I'm currently doing my masters project in contaminant transport, and not getting the desired results in FEFLOW. If someone is willing to help please let me know. Thanks in advance.

11 Comments
2024/06/14
05:15 UTC

1

HMS Interpolated Precipitation Bias Grid won't play nice with Curve Number Grid! Anybody run into this issue before?

Help needed! I have a HMS model with a working SCS Curve Number grid, discretization, and ModClark transform method, and I want to upgrade my simple hyetograph to an Interpolated Precipitation Meteorologic Model. I'm in an area with only one reliable rain gauge and a lot of mountains, so I need to use a Bias Grid. I used PRISM annual normals as my bias grid and it works with a non-gridded basin, but when I try to run it with the curve number grid, it gives me geographic and/or missing data errors.

Here are the errors I get when I run it with the Curve Number grid:

https://preview.redd.it/0b3mfle18g6d1.png?width=2222&format=png&auto=webp&s=801607f74e487fb5bc2fcda59e9e61acc3c9d83c

But my PRISM and Curve Number Grids are clipped to the same geometry using the same projection and same cell size:

https://preview.redd.it/hgtiyp1w8g6d1.png?width=1722&format=png&auto=webp&s=38cddcba381823d5ac135af0cbb9539ab304e8c7

https://preview.redd.it/57y0dzzw8g6d1.png?width=2067&format=png&auto=webp&s=6099b291c5bfddef0d5d1dbd8580ffc4ef9f8c7e

I back-tracked and tried to run the interpolated precipitation using the same basin with an area-averaged curve number, and I got the following error:

ERROR 40516: Precipitation is missing or invalid for 495 of 4245 grid cells at 18Feb2024, 00:10 for gridded subbasin "Headlands".

So I backtracked even more and completely eliminated the basin discretization and switched from ModClark to a Clark Unit Hydrograph transform method, then it worked! Here's the results from the original gridded model with simple hyetograph (left) and backtracked lumped model with interpolated and bias-adjusted precipitation (right). They're so far uncalibrated, so don't come at me:

https://preview.redd.it/yci82qmqcg6d1.png?width=1162&format=png&auto=webp&s=add3ba22dc03f708c64b9946a07201d48bc5c688

Why won't my PRISM grid play nice with my Curve Number grid??? Do I need to go back to GIS to manually put everything into SHG instead of my local projected geographic reference system? Any help is super appreciated!!

3 Comments
2024/06/14
03:01 UTC

1

Vertical Staff Gauge Standard Detail

Hi All - Potentially dumb questions incoming.... Does anyone know of a standard detail for a vertical staff gauge/gage from USGS or USACE? I'm working on an Army Corps project and we need to mount a staff gauge to the side of a sediment pond. I keep seeing retailers selling USGS Style A/B/C/etc gages but I haven't found a detail or spec that calls out when to use each type or how they should be mounted. Seems like there should be a standard detail floating around but I can't find it. Thanks!

3 Comments
2024/06/12
22:13 UTC

0

Research Academy success achievement. Top 0.5% 👍. https://latrobe.academia.edu/YohannesYihdegoWoldeyohannes

0 Comments
2024/06/12
20:37 UTC

2

Flood Plain Managers Struggles and Goals

Is anyone in this subreddit a Flood Plain Manager? I'm currently applying at a company that serves flood plain managers in local government so I wanted to better understand the everyday struggles that flood plain managers experience and what outcomes flood plain managers are trying to achieve.

In my initial research it seems that staying NFIP compliant and trying to get better Community Rating System discounts are some objectives, but it would be greatly appreciated to have someone's perspective in this role.

Thanks!

1 Comment
2024/06/11
18:05 UTC

17

Does anyone here work at a national park? What is that like?

Im currently an undergraduate aiming to become either a hydrologist/hydrogeologist or maybe an oceanographer, heavy on the maybe. I recently had to turn down an internship at a national park, which would have been great, but just wasn't right for my current situation. Maybe after I graduate.

Now, while I had to turn it down, it did make me think about potentially working at a national park as a hydrologist after graduation and all that. On the surface, I think that sounds pretty cool. For those of you who work in national parks, what is that like? What kind of work do you do?

5 Comments
2024/06/10
14:52 UTC

9

HEC-RAS vs. HEC-HMS 2D Infiltration Capabilities

There was a post of few days back about the HEC-RAS vs. HEC-HMS infiltration capabilities for 2D simulations (LINK). Most of the confusion was over whether HEC-HMS could infiltrate surface runoff from adjacent cells. I emailed one of the developers and got this response:

"HEC-HMS and HEC-RAS actually compute infiltration similarly.  We reverted the different infiltration logic within HEC-HMS.  In both applications, losses are taken from the hyetograph.  Once runoff is generated, it remains on the surface and isn’t subjected to further infiltration computations.  We may revisit this in the future though."

Basically, if you want to account for infiltration of surface runoff you have to come up with some work-around as of right now. Hope this helps!

u/montmike u/abudhabikid

7 Comments
2024/06/08
14:58 UTC

1

Survey Cross Sections

Can someone help me with a guide to frequently of x sections to get from surveyors to build an adequate model? River. 60 feet wide or is. Decently shallow. Probably 4 feet or so.

10 Comments
2024/06/07
22:44 UTC

0

Help with interview

The only thing I lack is having limited drafting/autocad experience but l'm quick to learn. What's the best way to quickly gain some knowledge in drafting/autocad?

Job description: Must be knowledgeable in drafting, data logging, computer software (Excel, Word, Autocad, Email), specification review and interpretation, drawing review and interpretation, and effective communication with the field engineer in regards to quality control issues.

1 Comment
2024/06/07
15:20 UTC

1

Stage hydrograph in HEC-RAS

I'm new in using HEC-RAS. we were given set of data with boundary conditions by my professor which is a flow hydrograph and a stage hydrograph for downstream. we were required to solve flooding by using two methods. Dredging and floodwalls. however, I noticed that regardless of how much dredging i do in the river channel, the maximum water elevation is still the same and cause flooding. what should i do? Can I change the refrence pt of the stage hydrograph?

3 Comments
2024/06/07
12:45 UTC

4

What is this green line on these mountian?

I was looking on google earth around the area I live in and found this mountain with a very dominant green line across it. Do any of you guys know what it is? Is it some sort of water bed? Plants there look to be thriving....

https://preview.redd.it/9swmtsixb45d1.png?width=1198&format=png&auto=webp&s=bd96e7ff0e2427ad263da3b2b63ac7a826084eff

Coordinates:
25.340699, -100.505648
https://www.google.com/maps/dir//25.3466076,-100.523076/@25.3396763,-100.5234464,3855m/

2 Comments
2024/06/07
09:26 UTC

1

XP-RAFTS

I’ve got a legacy XP-RAFTS model but my XP -RAFTS software has limited number of nodes support, and this model exceeds that number of nodes, Is there any other , preferably free, software that can import RAFTS models?

1 Comment
2024/06/05
22:57 UTC

2

HEC-HMS 2D

I am looking into 2D HEC-HMS, but typically want to export depth or velocity rasters like you can from RasMapper in HEC-RAS. Can anybody tell me if you have the option to export rasters from HMS or potentially open the results for export in RasMapper?

4 Comments
2024/06/05
17:12 UTC

0

Expert input needed from Hyrdology experts

Dear hydrology experts,

Your knowledge is needed for a study on geographic question-answering. I would greatly appreciate your input in reviewing some questions and answers related to your area of expertise.

The aim of my study is to assess the quality of different kinds of answers to questions related to geography.
With your expert input, I want to distinguish whether:
[1] the question type (Bloom's taxonomy),
[2] the geographic subdomain (hydrology in this case),
[3] and the source of the answer (there are 3 sources/answers per question)
matter to the quality of the answer.

The survey takes around 5-10 minutes to complete, and your participation would be incredibly valuable for my study. You can find the survey link here: https://survey.uu.nl/jfe/form/SV_6zFHhPrmL9v6s2q

Feel free to reach out if you have any questions!

Kind regards,
Bram

4 Comments
2024/06/05
12:17 UTC

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