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  1. Cherie

    reservoir mixing?

    Hi, Do you have any tips for the best way to promote mixing in a potable water reservoir? In this case, the reservoir I'm designing holds 1.0 million gallons (32' shell height, 74' diameter). We used to use a reducer angled upward at the inlet (eg. 12" to 6" reducer to increase velocity)...
  2. Cherie

    seismic design of steel water reservoir

    Hi, I'm designing a 32-foot high, 0.5 MG reservoir in Seismic Zone 4 in California, and the geotech engineer has supplied us with three different design spectral graphs by 1) Campbell & Bozorgnia, 2) Boore, and 3) Sadigh. I've been instructed to use the most conservative of the three. Sadigh...
  3. Cherie

    seismic design of reservoirs

    Hi, I'm designing a 0.5 MG reservoir in Seismic Zone 4 in California, and the geotech engineer has supplied us with three different design spectra graphs by 1) Campbell & Bozorgnia, 2) Boore, and 3) Sadigh. I've been instructed to use the most conservative of the three. Sadigh results in the...
  4. Cherie

    Comparison of Erosion Control Measures?

    *Awesome*, thanks for the concise and informative comparison, Iha. Thanks also to dicksewerrat for listing 3 more options for Iha to include in his quick tutorial. We went with the erosion control blankets because we knew the City would approve them, and that they were reasonable for our...
  5. Cherie

    Comparison of Erosion Control Measures?

    We're designing a large detention basin (10 acre site, 6.1 ac-ft of storage), with 2:1 side slopes. Could someone give a summary of what each of the measures listed below is, including whether it is temporary or permanent, and compare the advantages and disadvantages of each? (For example...
  6. Cherie

    standard headwall design?

    I checked APWA and LA County standards for a standard headwall design, but didn't find anything. I've never designed a headwall before, but I would think it would be simple enough that there would be a standard design for it somewhere. Does anyone know of a standard headwall design I could...
  7. Cherie

    rip rap design for detention basin?

    We're designing a detention basin with a 25' wide, 2' deep concrete inflow spillway, that will take a maximum inflow of 336 cfs during the 50 yr storm. The spillway flows into a concrete low flow swale at the floor of the basin. On either side of the spillway at the bottom of the slope in the...
  8. Cherie

    Storm Water Catch Basins

    Hi everyone, I'm working with wehr6 on the contingency drainage design. I have 2 questions for tincan (or anyone else). 1) When you refer to 1 "standard" grate + 1 std curb inlet having an inlet capacity of 1.6+2.5= 4.1 cfs, which standard are you refering to, and what are the dimensions...

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