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  • Users: ctbailey
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  1. ctbailey

    Septic Tank top half as two-way slab?

    Hello to the group. I've got a precast rectangular tank that I am trying to analyze. The tanks are cast in two sections, a top and a bottom. The slabs are integrelly cast with the walls, forming essentially a two-way slab with a continuous knee-wall around the perimeter. The tanks range in...
  2. ctbailey

    Tc pipe segments as well as Modeling as No-Storage ponds?

    Hi all, I'm having a senior moment. I can't recall the BestPractice with regards to Tc segments through a subcatchment. I prefer to model catchbasins, drain manholes and the piping using insignificant-storage ponds. But... should these pipe segments be included as Tc segments as well? Or...
  3. ctbailey

    Broad CrestedWeir Profile for Level Spreader

    Hi everyone, In HydroCAD, I'd like to model my typical level spreader as a pond with insignificant storage. My preferred level spreader design incorporates a level "lip" that is usually 10 to 20 feet long, with a height of 1 foot. My preferred profile is 1:1 on the upstream side, and 4:1 on the...
  4. ctbailey

    which ASTM standard to buy for aggregate gradation?

    Hello. I am putting together a set of specifications for permeable pavement, and a few of the paver-stone manufacturers have suggested which aggregates to use as subbases. I have seen the following called out: "ASTM No.8" "ASTM No.2" "ASTM No.57" Which standard would I purchase from either...
  5. ctbailey

    Want to purchase permeameter

    Has any one here have a good supplier to purchase a constant head permeameter? Our state has adopted new rules that allow designers to incorporate the saturated hydraulic conductivity of subsoils to be utilized in infiltration techniques. Thanks, Craig ___ Craig T. Bailey, PE...
  6. ctbailey

    Using Hydrocad for L.I.D. items?

    OK, I've entered into the green world of "L.I.D." Or "Low Impact Development" techniques. A common "LID" BMP is a "rain garden" or sometimes refered to as a "bio-retention" cell. My question regarding Hydrocad... In respect to the bio-retention cell, this facility is designed based on the...
  7. ctbailey

    Tc channel segment = depth of 2yr flow???

    Hello. Hydrocad 8.5 user here. I recently have submitted a storm water runoff analysis/design to a local reviewing agency. during their review of my work, a review comment was included, directing me to adjust my analysis. The comment was: "you must change the flow depth of the channel Tc...
  8. ctbailey

    Treatment options for roof runoff?

    I have been hit upside the head by a State Regulator, saying that they now require all roof runoff to be treated. Just as they require parking lot storm water to be treated, (to remove oil,grit, etc.) So, I ask the collective: If a metal roofed building is constructed with gutters that are...
  9. ctbailey

    pond outlet culvert vs. pipe reach question

    Hi. I know, this topic has been beaten badly, but i still have a question. I have a simple driveway culvert that I have modeled as a reach, and also as a catchbasin pipe outlet. The pond outlet model indicates the culvert is undersized, and the flood elevation is breached. (I set the flood...
  10. ctbailey

    Tc for upstream pipes into catch basins

    when i model catchbasins i typically use the "catch basin" type of pond, and model the outlet as the down stream connecting culvert. How do I "take advantage of the Tc" of the outlet (downstream) culvert as it traverses across my next downstream subatchment? In other words... I am wondering if...
  11. ctbailey

    where to find AASHTO traffic loads?

    Hello. I would like to find information on vehicular traffic loads as they pertain to live load surcharges over an MSE wall which is to be designed. Which AASHTO manual should I look in? Specifically, I need to know what surcharge I should design for HEAVY FORKLIFTs. The kind of fork truck...
  12. ctbailey

    How to read a pump curve correctly?

    Hello to all. I am needing to "size" an effluent pump, one which will be used in a proposed onsite septic absorption field. I intend to specifiy "black poly" or polypropelene pipe/tube for the pressure line. 1. I have calculated the elevation head. 2. I have calculated the friction loss...
  13. ctbailey

    modelling a porous check dam?

    Hi to the group. here's my situation: I am modeling a treatment swale as a pond, with a broad crested weir as the outlet structure. The problem: The outlet hydrograph is showing an oscilating flow: zero flow up to several CFS. I'd like to model the broad crested weir as a "check dam."...
  14. ctbailey

    has the exfiltration units changed in 7.1?

    Hi. Call my crazy, but wasn't exfiltration always modeled in ft/min? The current exfiltration page is asking for in/hr. The current HELP function associated with Exfiltration has a few examples of exfiltration rates, but those appear to be the old units of ft/min (could even be ft/hr - I'm...

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