r/Hydrology

Hi everyone,

Wanted to share a quick result before pitching the toolkit. I refit the federal Bulletin 17C flood-frequency analysis for USGS gauge 01646500 (Potomac at Little Falls, 1931-2025, n=80) using a Python toolkit I've been building. The Log-Pearson III 100-year estimate is 443,000 cfs vs the FEMA DC FIS published value of 475,000 cfs, a delta of -6.7%. All four return periods (10/50/100/500-yr) match the FIS within ±10%.

Notebook with the full analysis, Q-Q diagnostic, and validation table:

https://github.com/Rekin226/aquascope-demos/tree/main/01_potomac_flood_frequency

The toolkit is AquaScope, MIT-licensed and open-source. It unifies 12 water-data APIs (USGS, FAO AQUASTAT, FAO WaPOR, GEMStat, EU WFD, Copernicus ERA5, Taiwan MOENV/WRA, Japan MLIT, Korea WAMIS, OpenMeteo, UN SDG 6, US WQ Portal) behind one Pydantic schema, then layers Bulletin 17C FFA (GEV, LP3, Gumbel, GPD, non-stationary GEV, EMA), baseflow separation (Lyne-Hollick, Eckhardt), 22 hydrological signatures, FAO-56 Penman-Monteith ET₀, and an AI methodology recommender on top. 534 tests, validated against the CAMELS benchmark.

Repo: https://github.com/Rekin226/aquascope

Install: pip install aquascope

What I'd really like feedback on is the non-stationary GEV implementation. We fit it as a maximum-likelihood GEV with time-varying location (μ = μ₀ + μ₁·t), and test the trend via likelihood ratio against the stationary fit. For folks who've done this in practice, is that the formulation you'd expect, or would you push back? Are there censored-data scenarios (EMA) where this approach would break down?

Open to other critique too, honest feedback welcome.

Hi everybody.

I am a civil engineering student finishing my degree this year. I am looking for some masters here in europe in the field of hydrology/hydraulics engineering.

I study in Brazil but I double nationality, which makes it easier for me to come here. Currently I am living in The Netherlands and would be nice to find something around here.

Do any of you know a good quality program in this field?

Hello, everyone, I’m a freshman in a community college who is currently in a major that involves hydraulic engineering and environmental engineering. As I know, our job is mostly about solving problems from government. However, I’m also wondering: What else can you do besides working for government or starting a company if you want to have a job in this field? Is personal service an option for my major?

Hello everyone. A google search of this topic brought me to this subreddit and it looked like some pretty qualified experts were willing to pitch in. Hoping for the same luck. Thank you in advance for your time.

TLDR: what is the best culvert cap design to prevent continuous washout here?

Context:

First start to finish home build project in South Florida. Old grove and farm property converted to residential. Sandy/silty soil but customer had 80+ loads of regular fill dirt brought in. Front (east) side of the property has a ditch that we had ~55' of 18" double walled HDPE culvert installed in and then backfilled with soil, base rock, and then 57 stone on top; however, the problem is the culvert edges...

Lots of pictures below, but the short of it is: county road department requires a concrete culvert cap of the following specs: 4" thickness, reinforced with 6x6 wire mesh, that extends 18" beyond the culvert opening on the top and sides, and mitered at a 3:1 slope (1 foot of run for ever 3 feet of rise).

We've been having our asses handed to us with rain this entire build. We had the entire property (1 acre) graded to sod ready when a storm came through and created a ton of wash out the beginning of April. Land development/sod contractor regraded everything, extended the culverts out another 8', and sodded on April 16th. It's been great and took root quickly; however, we got heavy rain this weekend (1"+) and already have washout from under the sod that I can only imagine is going to get worse. I know we have to do a culvert cap, but the other culvert caps on the other properties out here are getting washed out as well. One owner put rip rap rock around his but you can still see the dirt washing out from under it and the rock sinking.

I was talking with a guy from the road department and was thinking we could just make the culvert cap much larger as there's no maximum, only a minimum requirement. They could also "bowl" it to wrap the curve above the culvert and go much higher. See last image.

Looking for some expertise and input on what the best "set it and forget it" method would be. Concrete contractor thinks doing it the same way the others are would be fine despite the washout. Thank you so much in advance.

Runoff from 2.5\" rain on April 7th - 1

Runoff from 2.5\" rain on April 7th - 2

Regraded and sodded with Bahia on April 16th - 1

Regraded and sodded with Bahia on April 16th - 2

1 month post sod runoff on May 17th - 1

1 month post sod runoff on May 17th - 2

1 month post sod runoff on May 17th - 3

Culvert shape idea/proposal - still concerned with the runoff to the top right you can see

I could go three days without producing anything at work, and my boss genuinely would not know. No deadlines, no tracking, no management tools. Everything runs on verbal agreements and mutual trust. Two years in, I'm starting to wonder if this is a privilege or a slow trap.

I'm a hydraulic engineer, graduated in 2024, currently two years into my first job at a small civil/roads consulting firm in France. We're three people: my boss (the owner, 68 years old, the technical lead and the only other engineer), and an office manager. That's it.

I'm not French. I came through an international exchange program between my university in South America and a French engineering school, ended up staying, and this firm was my first real work experience as an engineer, aside from a few internships I had done during my studies.

My role is hydraulic modeling, flood analysis, and checking whether road projects are compatible with inundation constraints. I have a solid technical background but limited field experience. When we do align on a project, the dynamic works well. We brainstorm together, he sets the overall direction, and I follow his lead. After those exchanges, I handle roughly 95% of the production, and he fills the gaps and reviews before it goes to the client.

The problem is that those moments of alignment are becoming rarer. The firm has a reputation for being technically strong but chronically late. He's managing clients, production, and the business basically alone, and I fall somewhere at the bottom of his priority list, not out of indifference, but because there's always something more urgent. In practice, this means:

• No real deadlines. If he tells me "get me a report," I set my own timeline.
• No management tools. Everything is verbal.
• No one checks what I'm doing day to day. I could go three days without producing much and it wouldn't register.
• When I submit work, he might take two weeks to review it. So the cycle is slow on both ends.

I work at my own pace, and that pace is probably slower than it would be somewhere else. I figure things out as I go, which has taught me a lot, but without external pressure, I don't really know if my output speed and work habits are anywhere close to what's expected in a normal firm.

In March, my boss had a cardiovascular incident and I was alone in the office for a month. When he came back, we briefly went over my projects, but that was about it. He is still catching up on his own backlog, and he can barely manage his own production, let alone mine.

He's also mentioned wanting to sell the firm. But he is the firm, his relationships, his expertise, his reputation. I don't know how that plays out. What I do know is that something will likely shift in the next year, and I might have to look for another job.

That's what worries me. Not the job change itself, but whether two years of low-pressure, self-directed work has quietly shaped habits that won't survive in a more structured environment. Real deadlines, actual project management, someone tracking deliverables. And doing that transition with a visa in the background, raises the stakes a bit more.

Has anyone navigated something similar? Small firm, high autonomy, then moved to a more traditional structure? Was the transition hard? Is this kind of environment a gift or a trap?

Note: I used an AI tool to help structure and phrase this post. English is not my first language and I wanted to make sure my thoughts came across clearly.

Is there anyone who is working on a hydro site?

I'm a recently passed out student and I have done a project on structure

Tara malai 1 week ko laagi matra reservoir site maaa gps data haru ligna parni xa vanera bolaaunu vaako xa,

K bata lini ho? software like Arc gis maa kaam garna parni hoki?

Tyaa ta aaunu matra vanya xa,so any idea?

Hello, I'm a undergraduate student in a Watershed Hydrology course where we are using Hec-Hms for our term project. I finally got it to run a simulation but only some subbasins will produce a hydrograph. The other subbasins will throw out a "Error : Error opening editor. Contact HEC for assistance." Afterward they will let you open the results for them but will not produce any of the result files except for the precipitation and precipitation loss graph (while missing the hydrograph) and a snowmelt graph with SWE, Air Temperature, and Precipitation. I'd like anyone who has any free time to take a look at it and let me know what obvious fixes I could make. (I can send screen shots or send my files to others if need be)

https://preview.redd.it/j8lcbh6nkf0h1.png?width=1568&format=png&auto=webp&s=520b53812d794daf5acbb2b820ffb36e41df797e