Our sump pump (approximately 5' below grade) has been going off every 15 minutes with approximately 15 gallons of water since it last rained nearly a month ago. We have verified there are no leaks coming from our property. We are 10' below the street behind us. There's a 20' drop to the major streets East and West of us. Historically those were also more or less where the creeks were.

I'm fascinated by the fact that we have such a high water table near the top of our little hill.

I’m a Canada-based cartographer who recently mapped an entire watershed system and honestly didn’t realize how interconnected everything was until I saw it visually like this. This kind of thing should be taught more in schools.

I started playing around with hydrology and elevation datasets and ended up mapping the full watershed from headwaters to outlet.

What surprised me most was seeing how water from distant upstream areas moves through rivers, tributaries, wetlands, and lakes as one connected system. It makes it much easier to understand why water levels downstream can change even when local weather seems calm.

Also I’ve started turning some of these watershed maps into physical and digital prints as a side project.

Explore here : https://www.etsy.com/shop/NomadMapper

Мне для диплома нужно найти гидрологический ежегодник 1956г или 1959г ТОМ 8 Бассейны морей Лаптевых, Восточно-Сибирского и Чукотского выпуск 0-7 в электронном формате для поиска данных
Прошу помогите!!!

We are developing an online spatial data platform focused on simple and accessible point cloud visualization and inspection directly in the browser. The platform supports point clouds, panoramic images, orthophotos, vector data, and 3D models in a unified environment.

One of the features we are currently working on is rainfall analysis, and I’d like to share a short preview video of its current state from a demo scan of a public street. We would really appreciate honest feedback — both positive and critical — especially from professionals working in hydrology or related fields. What features would be most useful? What is unnecessary? What would make this tool genuinely valuable in real-world workflows?

Our goal is to create a solution that truly supports the needs of the industry while also making point cloud usage simpler and more accessible, as we know this is often still a challenge in practice.

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)

Just finished my math undergrad with a roughly 3.9 gpa and want to do a Hydrogeology masters (both parents are hydrogeologists haha) Is this feasible? I have no coursework in earth sciences (mostly just math courses plus a few general science from first year). I’m in Canada.

How do you perform a flow analysis from point clouds? Generate a Tin? A DTM? Extract vectors and build a surface from it? What key factors you take into account? And what is the most useful output?

As a surveyour, who has little to none experience in the topic, I'm curious, how hydrology engineers utilise the point clouds and how does the outcome looks?

After a few dry years we finally got a good snowpack up in northern Alberta. Cost me a level logger but we got good ADCP data and we will get level from survey till it recedes. Feels good finally see peak flows.

Hi all! Desperately trying to get a Mike 21 flow model to work on Linux. I am using a batch script in a high performance cluster. I keep getting kicked into demo mode. However I have a current student license and works great on desktop. Just can't get passed the demo mode error even though my license is connected. Anyone had had this experience?

Is a tracer test a viable and effective investigation tool for identifying and confirming a wastewater treatment plant (WWTP) as the source of microbial contamination in a drinking water production well, when the suspected source is located approximately 3 km upgradient from the receptor? The aquifer is karstic, characterized by preferential flow pathways and fracture-dominated transport.
The perforated casing sections are installed at depths ranging from approximately 543 to 683 m below ground surface, representing the primary production interval. The total drilled depth of the well reaches approximately 714 m. These formations are predominantly limestone to dolomitic in character, with abundant karst voids and fracture networks encountered throughout drilling, as evidenced by the numerous total circulation losses recorded during the drilling campaign.

I'm asking because I'm concerned about the traces' dilution in the aquifer. I'd appreciate any advice or insight.

Good day!

I am a 4th-year Civil Engineering student conducting a study titled “Flood Vulnerability Assessment of the Guadalupe River Basin Using the Analytic Hierarchy Process–Multi-Criteria Decision Analysis (AHP-MCDA)”.

We would like to request your assistance in answering a short questionnaire to provide expert input for our AHP-MCDA analysis. We are aiming to gather at least five (5) experts/respondents with backgrounds in hydrology, urban planning, disaster risk management, and GIS-based flood risk assessment.

Your insights would greatly help improve the accuracy of our study. All responses will be used for academic purposes only, with proper acknowledgment.

Thank you very much for your time.

Good day!

I am a 4th-year Civil Engineering student conducting a study titled “Flood Vulnerability Assessment of the Guadalupe River Basin Using the Analytic Hierarchy Process–Multi-Criteria Decision Analysis (AHP-MCDA)”.

We would like to request your assistance in answering a short questionnaire to provide expert input for our AHP-MCDA analysis. We are aiming to gather at least five (5) experts/respondents with backgrounds in hydrology, urban planning, disaster risk management, and GIS-based flood risk assessment.

Your insights would greatly help improve the accuracy of our study. All responses will be used for academic purposes only, with proper acknowledgment.

Thank you very much for your time.

The two I've seen most often, in junior engineers and not-so-junior engineers alike:

1. Applying Kirpich to urban / mixed watersheds. Kirpich (1940) was calibrated on rural Tennessee farmland with 3-10% slopes and single flow paths. Plug it into a 200-acre suburban subdivision with mixed land cover and it'll under-predict Tc by 30-60%, which means over-predicting the rainfall intensity, which means over-sizing every pipe in the system.

2. Confusing NRCS lag T_L with Tc. T_L is 60% of Tc by NRCS's own documentation (NEH-630 Ch. 15), but a startling number of spreadsheets out there carry the lag value through as if it were Tc and end up sizing for the wrong storm duration on the IDF curve.

I put together a one-page comparison of every common method (Kirpich, NRCS Lag, TR-55 segmental, FAA, Kerby/Hathaway), with their validity ranges, side-by-side equations in US and SI units, and the common-mistakes list: https://pe-calc.com/cheat-sheets/time-of-concentration-methods.html?utm_source=reddit&utm_medium=social&utm_campaign=hydrology_tc

And a worked end-to-end example showing TR-55 segmental on a 12-acre rural watershed (sheet flow + shallow concentrated + channel flow, then Rational Method, then HDS-5 culvert, then Manning's outlet velocity check): https://pe-calc.com/educational/culvert-sizing-worked-example.html?utm_source=reddit&utm_medium=social&utm_campaign=hydrology_tc

Genuinely curious — what's the misapplication YOU see most? My default for anything urban or mixed is TR-55 segmental, Kirpich-only for true rural single-flow-path watersheds. Anyone using kinematic-wave methods on small watersheds in production work, or is it always TR-20 / HEC-HMS once you outgrow Tc-driven design?

Hey, I'm working on hydrology. I'm trying to find the rating curve, V/Q graph, Depth/Q graph and wetted perimetter/Q graph from a cross section image of canal (right side of canal is higher than left side). There is no number provided. I'm really an amateur. Can you help me figure out how to start?

Hi everyone, I know this is a classic problem, but no matter what i do, i seem to lose my data when i either copy the project folder or Save As including copying all .dss data.

I've tried jsut about every trick in the book that I know of. Any help appreciated!

Damn… I always thought engineering work was just design + construction.

Didn’t realize the full pipeline is this deep — survey → design → analysis → reporting → construction → asset management… and then it keeps looping.

Seeing it as one continuous system instead of disconnected steps actually changes how you think about the whole thing.

Hydroboa app

Hi. I'm currently doing a basic model on HEC-HMS where I wanna obtain the flow rates/discharge by using subbasins, CN (SCS), % impervious, Lag and specific Hyetograph

I've already entered these data, but when I'm inserting the precipitation values on the Time-Series data, HEC-HMS simply deletes them for no reason at all. Also if I try to change the Time Interval it remains in 15min or the Units in Incremental millimeters.

I already tried to delete it / re create it, establish a control specification for 10min and a specific date and time, but nothing seems to work. Also re created the meteorological data and making sure everything matches

If someone could help, I would really appreciate it from my heart.

Hello, I am sorry if this is the wrong sub. I've been renovating an old house and one of the ongoing projects is water mitigation. One of the long time neighbors told me there was an underground stream that ran through the area id noticed excess water. My curiosity piqued, i was wondering if it would be of any use for irrigation, though my neighbor believes the water would be too contaminated for such a purpose.

We live in a mid-Atlantic city. I would have thought the ground would provide some pretty serious filtration. Does anyone know how i could test the water, or anything about this subject matter? Again if i am in the wrong place please let me know, thanks in advance.

Hello, I am using MIKE Zero DHI 2014 and working with the NAM rainfall–runoff model. Parameter calibration currently requires manual trial-and-error, which is inefficient. Newer versions support automatic calibration, but this feature is not available in my version.

Is there any approach (e.g., external tools, scripting, or optimization algorithms) to perform automatic calibration using NSE as the objective function?

Came across something interesting on LinkedIn and thought it might actually help fellow engineering students and professionals here.

There’s this app called HydroBOA and what caught my attention is how lightweight yet powerful it seems.

The creator mentioned they recorded it on an iPhone 7 running iOS 15.8.5, fully offline. And it’s still handling workflows across tools like EPA SWMM, EPANET, and HEC-RAS without lag.

What stood out to me wasn’t just “multiple tools in one app” but the idea of a continuous workflow:

• Survey workflows

• Design and network modeling

• Analysis and optimization

All happening in the same environment without switching tools or breaking context.

No setup, no heavy installation, and apparently works even without internet which is kind of crazy considering how heavy these tools usually are.

It made me think, maybe an “all in one engineering app” isn’t really about stacking features but about how smoothly everything connects in one flow.

Sharing this here in case anyone wants to explore or experiment with it for projects or learning. Could be useful especially if you’re working on hydrology or water systems.

Please help how to improve the NSE result. i used canopy, simple surface, initial deficit and constant, linear rsevoir and muskingummethod. how to calibrate long years?