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  1. RD-Design Engineer

    Modeling runoff of a small design-graded yard

    Dear All; I have a container yard to design stormwater drainage facility (about 10 acre). As per the local standards - I have to calculate the runoff using the modified rational method for a 100 year storm event. The client requirements is to design a detention pond - and I have done so using...
  2. RD-Design Engineer

    Designing a dention pond

    Thank you GeoEnvGuy late is better than never I found a refernce in the manuals of highways design (drainage part) from the ministry of transport
  3. RD-Design Engineer

    Designing a dention pond

    Thank you cvg very much. In conclusion - I can see most of the design standards are specifying a 100 yrs storm - for at least 24 hours. I tend to use this value - and it seams very rational. Best Regards
  4. RD-Design Engineer

    Designing a dention pond

    Dear cvg - the met office have a one number for avaerage precipitation per month - I checked it and it was not very useful - and by the way: what do you mean by RCJ standards, I did not get what it refers to
  5. RD-Design Engineer

    Designing a dention pond

    and this IDF curve is all what is puplished in the loacl standards - yes thats all
  6. RD-Design Engineer

    Designing a dention pond

    Dear fel3 - in California or any other loaction in the states you do not have any problem to find the IDF or the DDF - you can visit the NOAA Precipetation Frequency Data Server and you'll find all the data you need to size and design the pond - and a visit to the local county you'll find all...
  7. RD-Design Engineer

    Designing a dention pond

    Dear fel3 - unfortunately there is no a local guidance concerning this point and also there is shortage in the avialable data - so I have to make a carefull decision. The site is in Saudi Arabia - North West coast and there is no mention to this point in the local standards at all. it is very...
  8. RD-Design Engineer

    Designing a dention pond

    Yes Psmart - your point is absolutely correct, at some point there will be an overflow - I am studying with the owner to have an overflow tank that will drain to the local sewage line at a controlled rate - that is acceptable by the governing authority. I needed to confirm what is the runoff to...
  9. RD-Design Engineer

    Designing a dention pond

    It is a 10 acres area located near a harbor for container storage (it is off site) and as per the local authorities, no permit to drain to the local storm water drainage. The owner is to find a solution for local stormwater management - and of course, for the owner, he is seeking the cheapiest...
  10. RD-Design Engineer

    Designing a dention pond

    Hi All; I am designing a detention pond that will have no outflow - that means water will be detained till it evaporates. And of course I will design a primary spillway. The pond will be concrete lined (or concrete canvas) and it will be in an aried environment - but when it rains it has a...
  11. RD-Design Engineer

    Roadway Design Controls and Design Criteria

    Dear ACtrafficengr - you are actually confusing me more (LoL) - not you indeed: but FHWA, AASHTO and Dots The use of lane width, and shoulder width as a design control is very confusing - As per the AASHTO: those are design elements not design controls - I can understand very well that the...
  12. RD-Design Engineer

    Roadway Design Controls and Design Criteria

    thanks all - but here some quick notes civilman - your note is somehow related to what Montana DOT follows (for example) - but not other state DOTs dik - that's nice document and combines a lot of useful information - though different from AASHTO approach - but thank you for the share
  13. RD-Design Engineer

    Roadway Design Controls and Design Criteria

    For the purpose of a short educational webinar about the AASHTO standards on geometric design I have spent about three hours trying to define clearly what is the difference between design controls and design criteria - the AASHTO way - and I found it is clear in the AASHTO green book - AASHTO...

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