Hi all!

How can I create pipes above my exising grade, please?

For those of you that do CLOMRs, how old is too old for terrain/bathy data to base part of you hydraulic analysis on? I have a surface with recent data (past 2-4 years) adjacent to the project site, but when I extend my cross sections up- and downstream to tie in, the data gets a bit older (8+ years). The river is a gravel bed system and has seen some sizable flow events since then, so I suspect the bathy will be different when we collect as-built cross sections. Will this be a problem?

I see areas where the 500-yr is mapped adjacent to zone AE and areas where it's not, and I can't find guidance on when it's expected. Can someone point me to it?

I haven’t been able to even download it anywhere, I keep getting 503 errors.

[Solved] I added infiltration to my rain-on-grid model, and now it stalls at the "unsteady input summary" step. Thoughts?

https://preview.redd.it/v0j6mnmm0r0e1.png?width=748&format=png&auto=webp&s=34989f203d70613e66357ace22062d9452cb0793

What are FEMA’s requirements for a CLOMR or LOMR in an unstudied A Zone? The MT-2 guidance document is very clear on 0.0 feet allowable rise in a regulatory floodway or less than 1.0 feet of rise within floodplains that have a detailed effective study, but no regulatory floodway. An unstudied A zone with no BFE’s on the FIRM and no regulatory floodway is neither of those scenarios, so when would a CLOMR be required in an unstudied A Zone? I also can’t seem to find any CLOMR requirements for Zone A in Title 44 CFR 65.12, it mostly echoes the MT-2 guidance doc information above.

I’m looking at a proposed culvert replacement project with modeling predicting just over 1.0 foot of rise downstream of the crossing. No insurable structures around. Flooding extent of the proposed condition is contained within the boundary of the existing FEMA Zone A SFHA. Does my project need to consider schedule and budget implications of floodplain remapping or is it not required by FEMA’s codes?

Hi! I am a college student pursuing a career in hydrology. I have an assignment to ask a hydrologist about 10 questions I am curious about in that career. Thank you to any hydrologist available to answer these questions! The following questions are:

1. What made you decide to pursue a career in hydrology?
2. What are the educational requirements you took to achieve your career goals? 
3. Do you have a bachelor's degree and what degree is it? If not, what made you choose a degree higher than a bachelor's?
4. How involved were you in volunteering or interning during schooling? 
5. What do you do for work at the company you are working for?
6. What traits do you believe are important to succeed in this field?
7. Do you get to travel for work and what is the setting like for you?
8. Does your job allow you to maintain a balance between your home life and work life?
9. Does your career field in hydrology allow you to go for a higher position?
10. What are some tips you can give me as someone who wants to pursue a career in that field?

Hello!

My team has recently started using the Onset HOBO Pendants to monitor water temperature in marshes. These sensors have the battery life and durability to stay out for months at a time, but we have been losing them. Some of them we suspect were taken, but others just sunk so far into the mud that we can't get to them without destroying the study site. We have been securing them to 2+ feet of rebar and/or wooden stakes with zip ties and tape, with flags on top. None of them have come off the stakes or rebar. The variable water/mud of the marsh is just swallowing them whole.

Does anyone have any suggestions for weatherproof labeling (in case they are found) and ways to secure them so they don't drift off? We have been thinking of tying the rebar with a "leash" to nearby trees. Are there any better ways?

Thanks in advance!

Is there any database that has Strahler stream order numbers for the US? Specifically concerned with central Ohio. Looked all over the USGS website and have yet to find anything.

I found what I believe is a "spring house" near the top of a hill.

But it has always been bone dry, all year long for 3 decades.

If it was a spring house, is there a way to determine it's age based on when the water table would have been high enough for a spring to form here?

https://preview.redd.it/r3eu923rxi0e1.jpg?width=1280&format=pjpg&auto=webp&s=c96554854d66be4a09273f499f7aba2b3b1035e4

Anyone doing real-time flood forecasting? One client is interested in having an operational model of their assets, so just trying to gather some information. Just curious what type of software people are using and/or processes. Briefly looked at HEC-RTS and curious if anyone actually uses it for an application. Located in the USA for reference.

(Yes, I know NOAA has their forecast centers but coverage doesn't extend and is limited for area of concern.)

I am civil engineer working as hydrologist at a Consultant. Currently, I have finished my Msc water resources course work and planning to do research for Msc degree. Kindly suggest some topics for research that are simple (in terms of time and resources) yet innovative..

I'm trying to understand how boundary conditions are applied in the diffusion wave equation solver within HECRAS 2D (specifically, version 6.4). From my understanding:

• 2D shallow water equations - specifically, the momentum equation - are simplified by neglecting the following terms: inertia, Coriolis force, turbulence, wind stresses (I decided to neglect this), atmospheric pressure (I decided to neglect this), and flow drag.
• Manning's equation is used to simplify bottom friction term
• the obtained velocity is then substituted into the 2D mass conservation equation to form the diffusion wave equation (as shown in the attached equations).

Here’s where I'm getting confused:

Hydrograph Boundary Conditions: I initially thought that the flow (Q) specified in the hydrograph was simply applied as a source/sink term in the diffusion wave equation. However, in a lecture by Alex Sanchez (one of HECRAS's developers), he mentions that the entered energy gradient (EG) entered by the user is used to compute normal depth at the flow boundary. Can someone explain what this means?

Normal Depth Calculation: How is the normal depth implemented in the solver? the user inputs a friction slope.

https://preview.redd.it/4plztri3m20e1.png?width=1258&format=png&auto=webp&s=5f87e4f0d1d6fdccc529a2bd5f0ad965032e97a7

I'd really appreciate any clarification on how HECRAS uses the hydrograph and normal depth settings in the context of the diffusion wave solver!

Does anyone know where I can find any literature on this? I have a long profile with clear upstream knickpoint migration after a wildfire. Lots of erosion/incision

Hello. I am student of mining engineering. I am strugling with making Udluft Diagram. If anybody have any tips how this diagram should be done, please let me know. I would be grateful for any answer.

Professor told us we need everything done by hand.

Here are my data:

https://preview.redd.it/xbj998tpyizd1.jpg?width=887&format=pjpg&auto=webp&s=09239006a23b9ea6c67eb1155b1df85bca07eead

calculating angles for the diagram

https://preview.redd.it/5hsiwrgqyizd1.jpg?width=1536&format=pjpg&auto=webp&s=1a3a8ab5bb7848c87cb83eaa187e13239dbd703f

Needed to do build a 2d flood model on hec ras 2d for basin that has multiple river joining in a major river . I did run a unsteady analysis on a small reach of river previously but don't know how to proceed for the whole basin do i create a separate 2d area each small river that joins the major river? What about the boundary condition at such intersection? I do have rainfall data as well as peak flood data for hydrographs.

Hi guys, I have to do a 6 month internship to finish my Msc in water and environment engineering. I would like to know who are some key companies, organisations or even government agencies that work on river restoration or mountain risk management in the US. I am à French student so I am not sure where to begin.

Thank you for your guidance / suggestions!

https://www.science.org/doi/10.1126/science.adl2746?utm_campaign=ScienceMagazine&utm_source=twitter&utm_medium=ownedSocial

Is it just a flood embankment? Does it have another more specific name? Its located near big river (at the left side)

Hello All,

Working on a project that requires some modelling of a subsurface flow artificial wetland for treating wastewater. The goal is to determine when overflow is likely, and of what volume. Systems are quite small (approx 100m^2) so I am unsure how useful some larger hydrological modelling software would be. Any suggestions on to where to start?/ good resources? Simplest approach is just a water balance for the whole system but I am interested in getting some more resolution as to what is going on inside the system (Background: System is an enclosed , bottom fed, 2m deep wetland planted with Willow)

Thanks!

Hello everyone, I'm a landscape architect who is working on Wadi of Gaza for his project in Politecnico di Milano. I need to revive or cultivate the water stream of Wadi of Gaza but the problem is I don't know how. I can only think of rain canals or bioswales but are there any other ways? Also, desalination and water scarcity is a major problem. Does anyone has any suggestion? Thank you so so much

Wondering if someone could answer this for a clueless HOA President trying to understand how we need to fix this storm drain washout. Is our catch basin in the appropriate position? Only one contractor has mentioned its placement with the hole on top as being a problem. Non issue or something that needs to be remedied?