• Hydraulic Analysis on Agriculture Irrigation System

    I have a short agricultural irrigation system (a main) that provides water to farmers. The head of the system is a canal with a structure that provides a constant head of water elevation during the season. There is no pump to deliver water to the customers…
  • Large Negative Pressure on model

    Hi, I am quite new to this software and am still in the learning process. I'd like to ask regarding a few uncertainties with my model which I believe are parts that I have missed out on. Firstly, I'd like to explain briefly on the background of the…
  • Difference between Head and Pressure

    For reference, have looked at previous answers including the following: https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/54400/pressure-and-pressure-head-what-are-the-differences https://communities…
  • inserimento air valve dopo evento transitorio arresto pompa (ho bisogno di aiuto)

    buongiorno, dopo tante domande siamo quasi arrivati alla fine del problema. Dopo aver calcolato un'analisi transitoria di arresto di una pompa con numero di giri variabile ho problemi relativi alla cavitazione e quindi ho inserito dove ho questi problemi…
  • Flow - pressure relation, emitter coefficient

    Hello, I have a question related to the emitter coefficient of junction. My task is to determine how much will change the flow at the downstream reservoir(which in the program I consider as a junction) if we change pressure breaker elevation for +10m…
  • Partially Closed Valves in water supply system

    Hello, I'm modeling a high pressured water supply system full of partially closed valves (which people use as some kind of "prv's" to reduce pressure because they don't have enough money to buy it). The information they gave me is D(mm) of a valve,…
  • Can I associate a pattern of pressure into a junction?

    I'm building a model where I have pressure data in intervals of 15 minutes on a node and I would like to associate this information into the model, making the demands adjusts to obey the pressure measurement curve at the input node. is it possible?
  • Pressure Spiking in WaterCAD system model

    Hello All, I am modeling an existing system in WaterCAD version 10.03.02.75, where there are currently low-pressure problems in the far southern area because all the wells are in the northern area. When I run my model, the pressure bounces between low…
  • Extreme negative pressures and hydraulic grades

    Hello, I have imported a model into WaterGEMS and entered as much info as I have from the client. When I run the model, I am getting some very extreme negative pressures and hydraulic grades. The areas of the model in question are at high points in…
  • WaterCADD - Reservoir influence

    I just recently started using WaterCADD. I am trying to model a system that involves pumping water out of the bottom of groundwater wells and into a collection tank. In order to supply water to the pumps, I am using a Reservoir (set at 1' above the pump…
  • Como superar o mejorar las presiones negativas en las " presión extrema cabezales"(extreme pressure and heads)

    Hola, tengo presiones negativas en las "presión extrema cabezales"(extreme pressure and heads),el sistema es un modelamiento transitorio en HAMMER(adjunto archivo) Ademas me sale este mensaje 44845 "Con tanque unidireccional" "Pipe" "209" "LINEA…
  • Potable Water Distribution Design for communities - use of PRV's

    Hi all, I have a general question on the use of PRV's at individual services for a "closed" distribution system, i.e. pumps directly draw from a treated reservoir and feed to end-users with no elevated/pressure tank and storage elsewhere. I have come…
  • Getting reliable results from Bentley Hammer

    Hi, I am modelling a simple system to compare the results to some codes that I have. But, despite having all the configurations similar to codes, I cannot get similar pressure fluctuation. Could you please have a look and let me know the reason? …
  • Optimizing pressures in a distribution network

    I am trying to optimise is the performance of PRVs in a distribution network. Is the Darwin designer the best application to use for this in WaterGEMS? It appears as though I can only select pipes for my design group. Is there a way I can select the all…
  • Water Level Spike in Surge Vessels

    Hi Bentley community, We are currently doing a detailed design for surge mitigation project and we are using HAMMER to simulate transient event. The model is extremely simple: Pumps Station -> Surge vessel #1 -> 2 km main-> Surge Vessel #2 -> 2 km…
  • Why does the pressure increase with time?

    Hi. I'm a newbie at WaterGEMS and am trying to do an EPS procedure in a typical network consisting of a single reservoir, a pump, one tank, and some 37 junctions. The simulation is processed smoothly, with no alerts. The tank is never completely full…
  • SIG Virtual Workshop: Bentley Hydraulics & Hydrology − December 20, 2017 - You're Invited!

    Don't miss the next Bentley Hydraulics & Hydrology Special Interest Group (SIG) virtual workshop on Wednesday, December 20, 2017 at 9 a.m. EST or 7 p.m. EST . The discussion will be led by Dr. Tom Walski P.E., Senior Product Manager, and will cover water…
  • RE: Absolute or gauge pressure in hydropneumatic tank results?

    Yes, the gas pressure is expressed in terms of absolute pressure. This wiki article on modeling a hydropneumatic tank is a modeling reference for the element and should be able to help answer questions that you have on it.
  • Pressure Subnetwork Accuracy

    How does changing the pressure subnetwork accuracy affect overall model results? I know it is the model convergence criteria set point. Specifically, I am in the process of evaluating piping diameters for a force main replacement project. Currently…
  • RE: WaterCAD - PRV and PSV

    Are you trying to model a combination PRV/PSV? If so, please take a look at the following article I just created and let me know if that configuration will accurately model what you want. How to model a Combination Pressure Reducing Valve (PRV) and…
  • Zero Flow after PRV valve in watergems

    Hi I have a large water distribution network modelling in watergems. in order to reduce pressures in a proper value, I have to place some PRV valves in the network. But when I put a PRV valve, and set the pressure, the flow in that pipe gets zero, resulting…
  • How can I simulate "pump stop" with a Periodic Head-Flow?

    Hello everyone, I'm simulating a displacement positive pump with a periodic head-flow and I want to simulate a possible pump stop and seeing the effect downstream. I put in the specifications of Periodic Head-Flow a short time but in the firsts seconds…
  • Adjustment pressure

    Hello everyone I have a problem with my simulation because I don’t reproduce the discharge pressure using “Periodic head-flow”. I’ve noticed that viscosity is fundamental for the network, logically when I changed the viscosity the discharge pressure…
  • Pressure difference

    Hello everyone, I´m using both, Hammer Bentley v8i and Pipephase to model a pipe system where the discharge pressure in result should be 429.9 psig in “Compute Initial Conditions”. When I reproduce the network using pipephase I obtain the expected…
  • RE: How can I adjust the pressure on the system?

    Thanks MPachlhofer and Jesse for your answers, Jesse I’m sending my model, I’ll explain you the main data: The fluid is Crude 16°API The total flow is 8750 gpm The viscosity changes along the network as I show on the graphic: I used…