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  1. thatdamengineer

    Modeling converging channel

    ok Thanks WWW.thatdamengineer.com
  2. thatdamengineer

    Modeling converging channel

    Peter, Thanks for the reply... I have a spillway with a cross section of 80ft bottom width and 5:1S/S at elev 1106. It has to transition down to elev. 1082 and an approximate 20ft wide channel w/ 1:1 S/S. When I said I tried, I got an answer, but should I use multiple reaches say at 2 ft...
  3. thatdamengineer

    Modeling converging channel

    Probably a very elementary question for many of you. I have a spillway channel concrete lined, 80ft wide bottom width 5:1 s/s. transitioning to a 20 ft wide channel w/1:1 s/s elevation deop from 80ft width to 20ft width is 24ft. How to model using Hydrocad... I have tried the reach node...
  4. thatdamengineer

    horizontal driling under a dam

    Thank you I have read this paper. I have determined that if the boring does not exceed 8psi there should be no danger of hydrofracking. Contractor has agreed to install a pressure sonde at the borehead to monitor pressure. Also sonde has an output that can be recorded and made a part of the...
  5. thatdamengineer

    Doppler flow measurement transmitted to wifi

    I have a very small town that for a client. They are under an order from the state DEQ to measure flow into their lagoon ( a new lagoon that has not yet risen to operating level ) and report it monthly. Due to the limitations of the town employees ( volunteers I am attempting to monitor the...
  6. thatdamengineer

    horizontal driling under a dam

    The fed design center overseeing this project does not want us to bore in the area. Boreholes within 50 ft of the drilling path could create a path for piping during the drilling. This appears to be one of those operations that cannot really be spec'd because of the art of this procedure not...
  7. thatdamengineer

    horizontal driling under a dam

    The foundation is in a red shale that is very prevalent in this area. The route will traverse an old creek channel that was filled during construction of the dam, but the depth of the drilling will be below the bottom of the old flow line of that channel. we have borings that were done 40...
  8. thatdamengineer

    horizontal driling under a dam

    I am really looking for some guidance on the allowable soil pressures that a discussion of the merits of the installation. WWW.thatdamengineer.com
  9. thatdamengineer

    horizontal driling under a dam

    Dsm is operated by a state/federal agency. We have been allowed to do this if they approve our specifications and procedure. USACE has some guidelines for HDD under levees and embankments. Mississippi river levee is much taller and higher hazard potential than this dam. State has deferred...
  10. thatdamengineer

    horizontal driling under a dam

    I need to develop specifications for horizontal drilling underneath a 50ft tall flood control dam. We expect to drill approximately 35 ft below the toe of the damn and emerge approximately 300 ft upstream and downstream of the structure. Does anyone have any information on the allowable...
  11. thatdamengineer

    Dam Break routing below dam

    Thanks for the reply! I thought that was the case. Being an old dinosaur in the business, I didn't want to learn a new program. I will just model it as several ponds until I get to the roadway section downstream. WWW.thatdamengineer.com
  12. thatdamengineer

    Dam Break routing below dam

    My question will probably seem to be very elementary. I am modeling a small dam in a subdivision that lines the creek below the dam. This creek then flows into a 10 acre floodplain with a roadway and culvert that forms a dam under high flows. How do I enter the cross sections below the dam...
  13. thatdamengineer

    Fuel filter location?? Why??

    While I realize I am just a lowly Agricultural engineer who has never designed a tractor, I have built several pieces of farm equipment and restored my share of antique vehicles, trucks and tractors. I cannot understand why anyone would attach a fuel filter on top of the fuel tank between the...
  14. thatdamengineer

    siphon pipe to drain a pond during emergency or for maintencance

    Just for a bit of practical experience, I once lowered a 120 acre lake 2 ft per day with 2 16 inch welded steel siphons and 1- 24 inch one. This was during an emergency caused by throttling of the intake tower outlet and also during the rainy period, so we had inflow dfrom over 10 inches of...
  15. thatdamengineer

    PMF using frequency analysis

    My experience in Oklahoma indicated that 25% PMF was about equal to the 100yr flood by TP40. This ranged from 20% in the eastern part of the state to 30% in the west. Therefore we used 25% as the 100 yr flood. Other floods were described as % of the PMF The PMF versus frequency is going to...
  16. thatdamengineer

    Service life of underground mild steel pipe

    In Oklahoma we use a lot of unlined steel pipe in dams as the principal spillway. Usually it is 5/16 to 3/8 minimum thickness. Our soil will corrode a corrugated metal pipe in about 20 to 25 years. I would recommend insituform or lning the pipe with polethylene. It has proven the best method...
  17. thatdamengineer

    Detention Pond Volume

    I performed this calculaton for 30 years while managing the dam safety program for the state of Ok. We used the average end area method when we could find contour maps. Yoyu have to remember that your survey or your input data will determine the accuracy of your study. In the early days of...

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