I have a project that involves a dam with a 130 square mile watershed. Part of the project is to de-water the impoundment. I am trying to model what happens when a storm event hits during these draw downs (empty unit, partially full, full). I have my stage-storage table, a user-defined outlet...
Is there a way within HydroCAD to model a partially open slide gate on the front of a round pipe without going into custom orifice development? My situation is a fixed crest dam with a bypass pipe that has a canal gate on it. I'd like to be able to model the flows through the pipe that come...
I am trying to model a river flooding into my project. I have the gage data for the river's elevation vs. time, but I'm having trouble trying to set that as a flow input for my unit. I'm looking to set either a subcatchment or pond that has a linear increase in elevation with respect to time...
I have a situation where I need to keep a pump fed with water that is flowing through a pipe with a negative slope. I set up a pond node with the culvert and an arbitrary storage area extending beyond my ranges of concern. When I check the discharge at low head levels (below the midpoint of...
I have a situation where I have a pond outletting into the ocean. A portion of the tidal influence will be above the normal water surface of the pond. I am interested in determining the effects on the pond due to ocean water, independent of rain events. My current model is a detention pond...
I have a reviewer that won't accept HydroCAD. What I'm trying to show is the effects of a change in pipe for a dam outlet. He wants a description of existing and proposed flows for all possible iterations. It's easy enough to toss the required information into a pond node and create a...
I have a few general geotechnical questions:
In designing a retaining wall, there often needs to be a key to resist sliding. The soil in front of the key has to go into compression. Is there a set distance in front of the key (the area in compression) where the compression occurs? If so, how...
I have been asked to get up to speed on dam breach analysis for permitting. Most of the work is low hazard, relatively short (under 10' high) dams. I don't have any real background in HMS or RAS. My general understanding is that HMS provides the hydrology and hydrographs, while RAS provides...
I am trying to model a ditch plug that doesn't reach the top of the bank. I want to check a weir vs. channel flow for the plug to see which is more likely to control. Since a reach node won't give me the elevation that the plug will back water to, I took a reach node, entered my plug info...
How does HydroCAD calculate the tailwater effect on a broad crested weir? I am trying to model a ditch plug that doesn't come to the top of the existing ditch. I don't have any downstream data, so any tailwater I put in has to be Stor-Ind routed. I played with the differential tailwater...
I'm running HydroCAD 8 and am hitting a snag. I have two ponds, each about 1 square mile in size, that are connected by a 48" pipe. I am proposing a new structure in the downstream pond that will have an invert 10' above the connecting pipe. When I select the higher invert as a starting...
