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  • Users: swazimatt
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  1. swazimatt

    Combining Epanet Networks

    I have two epanet networks for adjacent sites and would like to combine them into a single network but am really battling to import one into the other without loosing data the closest i got was exporting to text and then importing the text, but it only imported the text blocks and messed up...
  2. swazimatt

    Air valve on falling main

    I am reviewing a design of a ww rising main. The pipe is 150mm dia and the pumped flow is in the region of 30 l/s. total rising main is 885m At the request of the client the discharge location is about 233m past the last high point and about 4.5m below this highpoint (this is the only high...
  3. swazimatt

    Laying wastewater in deep topsoil

    I have a project where my 150mm dia (6 inch) PVC ww gravity pipe will go through a section of very thick topsoil (1m plus below the pipe invert). My question is should i undercut the full 1m+ depth until i get to bottom of topsoil and fill the trench to pipe bedding or will i be ok if i...
  4. swazimatt

    reservoir and Booster pumps

    I am in the process of designing a new industrial precinct that will require a storage for firefighting and a pump to supply the network. The idea is that the reservoir will be supplied by the network, but this will be the same network that the pump discharges into (as a booster pump and fire...
  5. swazimatt

    What would this cable have been for?

    Working on a sit that used to be a work camp in the 40’s and have come across these cables. Two copper cables about 3mm diameter surrounded by some sort of cement(?) all within a copper sleeve. I am a civil engineer so forgive me if this is obvious. Also not sure what the purpose of the copper...
  6. swazimatt

    Contract Clause Question

    We have a standard engagement contract (for consultants) that has the following clause: In providing the Services, the Consultant must use the degree of skill, care and diligence reasonably expected of a professional consultant providing services similar to the Services. and one of our clients...
  7. swazimatt

    Pumped Water Network

    I have designed and EPAnet modelled lots of gravity water networks but am now faced with my first flat-earth water reticulation that requires booster pump(s) The development will ultimately be made up of 4 large blocks of industrial land (no high water use) that surrounds a runway. The...
  8. swazimatt

    wastewater pumps with shared rising main

    Hypothetical question. If there are two wastewater pumpstations at different locations but discharging to the same manhole, what would the implication be if they shared the same rising main for the last section (a significant length of the total rising main)? WWPS are normally float operated...
  9. swazimatt

    Peak flow graph

    Does anyone have a graph showing standard or accepted peak factor flows throughout the day. I imagine there is a standard model that is used by modelling teams I actually want it for wastewater modelling, but imagine they would be fairly similar
  10. swazimatt

    wastewater pumpstation operational storage modelling

    I would like to know what the standard modelling procedure is for PWWF, PDF and ADF for wastewater. My understanding is that PWWF is for an hour in the morning and evening, but how would i model the rest of the day? We have a pumpstation proposed where the receiving network can only accept...
  11. swazimatt

    HEC-HMS Add Base Flow to Wetland pond

    thread789-447696 We have a wetland pond modelled to detain flow from the piped network for the 10year event and overland flows for the 100 year event. The catchment for the overland flow is different (smaller) to the 10 year pipe catchment. My stormwater engineer has informed me the level in...
  12. swazimatt

    Pavement Subgrade Question

    We are doing a new industrial subdivision and the insitu subgrade is quite variable. The natural material is (top down) topsoil - sands (CBR 6) - cohesive silt layer (Cbr 1 and lower) and rock. The depths vary across the site. the pavement has been designed for a CBR6 subgrade with subgrade...
  13. swazimatt

    Pressure measurement for Biofilter

    Hi I have taken over a project where the original engineer has moved on. The project is a wastewater pump station with a fan blowing foul air from the wetwell through a biofilter The design report and other design documentation states the following: Media lifetime may be 5 to 8 years or...
  14. swazimatt

    EPAnet Pressure Reducing valve

    I am trying to model a pressure control valve in epanet but cannot seem to get the PRV setting to work. My network is supplied from a single location but there are two plateaus, the upper one is fine, but the lower one would have pressure too high for residential use so i need to reduce the...
  15. swazimatt

    Existing Sewer Network Model Query

    We are looking at doing a development that will pump wastewater into an existing gravity network. We need to pump 12 l/s and the council has employed an international consultancy to carry out an assessment as they hold the model for the existing network. They ran the model and informed us that...
  16. swazimatt

    Vortex Dropper Design

    <<<< Apologies for the repeat post, but i think water distribution may not have been the correct place (and if i get no response here i may try stormwater next!)>>>> I would like to design a small vortex dropper for rising main discharge to gravity network and have been battling to find any...
  17. swazimatt

    Vortex Dropper Design

    I would like to design a small vortex dropper for rising main discharge to gravity network and have been battling to find any design information that will help with designing it, anyone here got some information on the hydraulics required? Flow is less than 20 l/s and the drop would be about...
  18. swazimatt

    biofilter pressure measurement

    I was involved in a wastewater pumpstation design that had a fan forced ventilation through a biofilter (a bark and lime chip bed hat removes the SO2 odours from the WWPS see attached plan). Unfortunately the biofilter designer is no longer working for our company. The design required a...
  19. swazimatt

    flow measurement options in wastewater manhole

    We are looking at discharging ww from a new development into an existing ww network. The council will be running some WW models and I suspect there may be very little peak flow capacity in the network, but quite likely some off-peak capacity in the network. In which case I would like to be...
  20. swazimatt

    Pipe rupture drain rate for air valve

    I am trying to size air valves on a wastewater rising main and i have come across a formula to determine the rate a pipe will drain under full rupture conditions. The formula appears to be from a vent-o-mat related source (or a very biased author) but i printed it out years ago because i knew...

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