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Recent content by cfj104

  1. cfj104

    Permanent Erosion Control For Rocky Slope At 2H:1V

    If you think you will be able to get the vegetation to grow (meaning you have good topsoil cover and soil conditions), you could use coir logs or similar wattles spaced along the slope to slow the flow of water and minimize the erosion. These are realtively inexpensive but would not be a long...
  2. cfj104

    First Tiem Designer - Please help!

    Wow, sorry all. I just re-read my post and can see that I was not very clear. The building arriving onsite is a prefab building with one toliet and one sink. As it turns out, all the internal plumbing is complete with the building and the only information I need to determine would be the...
  3. cfj104

    Riprap alternative - under a Bridge

    We used vegetated reno mattresses and articulated concrete block (at a NPDES discharge point) along a stream bank recently. We used the vegetated reno mattresses along the bank. The mattress were lined with erosion control blankets and then filled with a stone and topsoil combination (with...
  4. cfj104

    First Tiem Designer - Please help!

    Hello all, Not sure if I am posting this is the right forum or not, so please let me know. I have a site where we need to install an onlot sanitary system. We are going with a water well for service (non-potable) and an underground holding tank to be pumped on a regular basis for the...
  5. cfj104

    Pond Storage Question

    While writing my response to you, I figured out the answer. I went back through and checked my model and it does not appear to have any warnings. On the hydrograph, the peak elevation in the pond is below the top elevation of my pond. I have the top of my pond set at 230.5, the weir crest at...
  6. cfj104

    Pond Storage Question

    I have modeled a pond with an overflow weir as the secondary outlet at the top of the pond elevation and a culvert discharge as the primary outlet, located at the base of the pond. The question I have is that when I look at the Hydrograph table, there is water flowing through the overflow weir...
  7. cfj104

    Measuring Surface Infiltration/Runoff?

    I am actually trying to figure out what runoff does on a gravel lot. Typically, I model the surface with a CN of 85 (depending on soil type) but we are trying to figure out if these numbers are too high. Due to the gravel, we are concerned about getting a good seal with a double ring...
  8. cfj104

    how to estimate the amount of erosion wastes in a road project?

    Maybe a less technical approach... You say that the site is prone to 'frequent stability problems' - has a slope failure occured that you can measure the sediment produced? Maybe the simple way would be to look at what has happened in the past and use that as a way to budget for the future.
  9. cfj104

    erosion criteria

    It would depend on the fluid and what is being eroded. Typically during channel stability (in the case of erosion) the shear stress would be evaluated based on the velocity, surface cover, type of soil, liner, etc. and compared to the published data for the soil type. Based on this...
  10. cfj104

    Measuring Surface Infiltration/Runoff?

    Does anyone have any experience trying to estimate surface infiltration? Ultimately, I would like to be able to look at the infiltration rate and relate that number to runoff, but wanted to see what luck people have had doing this? The main problem that I think I will run into is preventing...
  11. cfj104

    Need some regulatory guidance

    Not sure if this helps you or not, but I read an interesting article in Stormwater magazine a month or so ago that addressed Riparian Buffers and their effectiveness for widths. It cited some actual studies and results of width on environmental impact reductions. Not specifically related to...
  12. cfj104

    Modeling Buried Storage Pipes

    Just a quick question. I want to model underground pipe storage (5, 10' diameter pipes, 100' long) and want to get the general consensus on how to input the data. The pipes will not be installed level and will instead be located within a hillside (approximately 15% slope). Currently, I have...
  13. cfj104

    Large Drainage Area into Small Pond

    I have a large site (16 acres) that drains into a small pond (146,000 gal) with a 12" discharge outlet. I am trying to evaluate various options for increasing the time of concentration on the site in order to attempt to lower the peak flow rates. One option I am evaluating is installing some...
  14. cfj104

    Infiltration Trench

    I am trying to model an infiltration trench with a perforated pipe embedded in the stone backfill. I am able to enter the below grade stone bed with the pipe embedded but this is where I am running into problems. Above grade, there is an embankment to allow the water to pool and then feed into...
  15. cfj104

    Low Growing Grass?

    Does anyone have any experience or know of a type of vegetation that grows no taller then 2' and will not require mowing? I have a site that I am developing and the neighbors are being permitted to have a say in the final site design and they have requested a low-growing grass (less then 2')...
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