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'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

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?

How are flood zones determined? Why is this map so old? Why can't I find any information on if they're working on a new map? Why can't I find any info on what elevation is considered a non-flood zone? I have been scouring FEMA's website and Topographical maps for hours, trying to understand flooding from rivers and such, and I just don't get it. I also did not even realize a brook flowed from the top left of this image into the river more to the lower right. But how is the "spread" even determined? FEMA's website may use too much jargon for me. Forgive me if this is not the ideal place to be asking these questions, if you have suggestions on where else I should post, I'll be glad to scoot to the next one.

https://preview.redd.it/f4rvii3tvzxd1.png?width=1938&format=png&auto=webp&s=8c1d8bda8563b1658d553661a87dd82cc2b964d6

I’m seeking advice on breaking into the water industry. I have a degree in environmental science with a focus on water, but after graduating, I worked in sales as a mortgage loan originator due to a tough job market. Now, I’m about a year away from completing my Master’s in Hydrology at OU, and want to enhance my competitiveness. I have heard horror stories about trying to break in when you have no/little experience. I’m a few months out of looking for internships and want to get ready. I am searching through internships and jobs to see what they require and trying to get those positions, I am attending water conferences, networking, joining water groups, volunteering, and considering getting certifications (HAZWOPER, coding, modeling programs, EIT/PE). Am I missing anything? Any additional advice would be appreciated. Thank you!

I made one of those ol’ career posts further explaining my situation awhile back, but upon my search for a grad program that would even consider me, I’m actually getting more and more confused with the specific degree programs and terminology.

In the actual field of hydrology and water resource management, will there be a significant effect on my job qualifications depending on which program I enter? Especially the whole thesis vs non-thesis, and M.S. vs M.E.

Again I’m just a lowly biologist that did not good during their undergrad, so I’m really struggling to even get my foot in the door. There also seems to be so many facets regarding water management. What might this industry need most given our ever evolving water crisis, particularly in the Southwest US?

https://preview.redd.it/0ra0xot94ixd1.png?width=6912&format=png&auto=webp&s=cefb6c94ad5dfc13ccd655b5007390ec8fc83729

As per the picture, existing over land flow intersect with proposed development. How can proceed this jobs? because we can't disturb the OLFP? Any suggestion plz?

Anyone have experience with hydraulic loading and POTWs? Potentially with industrial users, and stormwater mixing with their wastewater discharge?

I’ve noticed most POTWs, permit, codes, somewhere - specific to industrial users - they have language regarding prohibition of stormwater from entering wastewater treatment and being discharged.

I’m trying to understand more about this and if there are developed standards, approach or determination to what may be an allowable amount of stormwater, as it’s virtually impossible for some facilities to completely eliminate stormwater. That the nature of operations and activities, along with design of the facility, an incidental and insignificant amount may get commingled.

I was on a late night rabbit hole one day and swear I came across a presentation discussing this, possibly with a limit such as 0.5% of total process wastewater discharge, that would be allowed. But I can’t find that again.

I know that the City of Portland has in their code that industrial facilities must reduce impervious footprint to max of 1000 sqft, or demonstrate infeasibility. Most I’ve found don’t seem to quantify such as this, they just leave open and vague as if no stormwater whatsoever is permitted.

Hi all, I have streamflow data from one station (2002-2020). This will be used in baseflow analysis. However, data from years 2006-2008 and 2011-2012 are missing. Which method would you recommend to fill in the missing data? Thank you so much!

Looking for a heat transfer rate in Watts! (I just posed this question to r/Thermodynamics; since it is related to groundwater hydrology, I thought it would be relevant here as well)

I am designing a subsurface thermal mitigation trench for work. Providing a reasonable temperature gradient per distance would also be helpful, as I could back-calculate the conductive heat transfer rate. Sources preferable, but expertise is also highly appreciated!

More info: The trench(es) need to be sized to lose 7degC in a given length.

Initial sizing calcs:

1. Joules needed to be transferred to lose 7deg C from total water vol (specific heat analysis)
2. Joules that a certain vol of gravel (starting at 20degC) has the potential to absorb before reaching 27degC (specific heat analysis) -- result from 2 must be greater than 1 (that's how I got an initial trench geometry)
3. Darcy flow calculation to estimate the hydraulic conductivity that we'll need to pass our flow in a reasonable time (this is how we'll estimate our gravel class size -- hoping to do some field testing if able)

Calc I need an appx heat transfer rate for: 4) First, we split up the trench volume into small volumes: From Darcy, we can estimate detention time per small volume. For the first small volume, we know that Tw=27. To predict the end temperature of that first small volume and use that for the next small volume, we need to know an appx value for the heat transfer rate in Watts (aka the heat that the rock absorbs from the water). If we have that rate (reminder that a Watt is a Joule per second), we can multiply detention time by the rate to get Joules absorbed. From my specific heat analysis in 1), I know how many joules correlate to a degree lost in the water. I can then divide the Joules I lost in the small volume by the Joules/deg C lost in water. Then I subtract that deg C lost from the starting temp of water to be my starting temp for the next small volume. I will do that until I get to the end of the trench. I will then have an appx value for the temp leaving the trench.

5. Final and most challenging calc will be to estimate how long it takes for the gravel to lose heat to the surrounding clay soils. 2D heat conduction/partial derivative fun! Will do my best to simplify, let me know if you have any ideas!

What is the meaning of negative surface runoff in swmm

Does FEMA give base flood elevations (BFE) for their 500 year (0.2%) flood areas. I have looked at GIS files and the FIRMs and can’t seem to figure it out. Thanks!

How in the world do you use these programs? Is there a for dummies guide? My firm has asked me to learn them and I am at a hard stop because I can not figure any of it out. Help.....I feel old.

I recently bought 8 acres of land on a hillside, and I’m trying to understand it better from a hydrological standpoint. When I first walked the property in late July, after a long summer of almost no rain, I noticed that in some areas, the ground was inexplicably wet, even making squishy water noises as I walked on it. Access was very limited at that time due to many years of blackberry growth. Over time I’ve cut paths so I can reach most of the property, and I’m struck by how varied the water content of the soil is as you walk around even in small areas. Overall the plot averages about a 25 percent grade, with few areas that aren’t downhill at least a little. I see very little connection between how wet an area is and how steep it is and how much sun it’s getting. Some patches are bone dry to the point of being dusty, and in a few places, my footprints will fill with water as I step away. There’s no visible running water anywhere, though. The weather seems to only have a subdued impact on how wet things are. The soil seems either silty or clay, and seems like it doesn’t like moving much if water runs over it - I only see evidence of erosion in one or two spots. My land extends to the top of the hill - the other side is covered in developments, so my sense is at least some water is probably moving through the hill to my side somehow. A neighbor mentioned they thought the hill was layers of sand and clay. I’ve never seen any really sandy soil, and there’s surprisingly few rocks to be found anywhere.

So, I’m wondering things like:

• how much could I actually learn about specifically what’s going on under the ground, not just in general, but for this specific land?
• are there practical benefits beyond just satisfying my curiosity of mapping it out?
• am I right in thinking that drilling a hole could trigger changes in the hydrology? What range of effects could happen from this or similar actions?
• are there any cool things I could do with the property that I might not be aware of? Projects that require this kind of environment?
• how should I go about constructing walking paths that won’t disrupt things too much? Any pitfalls here?
• any interesting behaviors or experiments I could look for or try that I could show my kids?
• where else should I be seeking advice and expertise?

It’s zoned for a single residence, and I hope to build a house on it eventually, but in general I hope to only make changes that just make it a little easier to walk around. Pacific Northwest.

Central Texas 21 acres and on the east side is right now a dry creek bed. We are looking to put a house on the 2 acre triangle plot to the east of the creek for my parents and then put a house/shop/pool west of the stock pond. Leaving the back 15 acres for hay/cows/horses.

Green line is the property lines. Squares are the buildings

https://preview.redd.it/eo7793h3ccwd1.jpg?width=1280&format=pjpg&auto=webp&s=e3374bbbcfbb5fa4cd7a5d23231d819f520f80bf

Hi all, does anyone have any knowledge about the release date of the WBNM GUI? It's described as being expected mid 2023 on the website: Products | WBNM

Would love to give it a crack, so appreciate any info!

Hi all, I am trying to create land cover in HEC-RAS, I have downloaded the Land cover tif from NLCD and process it to shapefile in QGIS, when i try to create land cover in HEC_RAS, i receive this message. Can someone advise if he/she had the problem before?

https://preview.redd.it/qgjvwjsbnbwd1.png?width=1905&format=png&auto=webp&s=54317fce77399183ec267615fd418aff219ec988