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Recent content by PKAST23

  1. PKAST23

    HUC 8, 10, 12 watershed areas

    beej67, Agreed. But I am filling a questionnaire where this information is asked for a project I am working on. Not using the watershed areas for modeling or anything. Just curious if there is a website out there that can provide HUC areas in acres/sq.ft. quickly.
  2. PKAST23

    HUC 8, 10, 12 watershed areas

    Hi All, Does anyone know a good resource to find HUC 8, 10, 12 watershed areas in acres/sq. ft.? When I google, I am not finding that one website where I can find this info quickly. Is there a GIS map viewer where I can click an area of interest and find watershed boundary areas in acres? Thanks...
  3. PKAST23

    Floodplain Mapping (HEC-RAS to CAD)

    Thanks everyone for responses. Looks like I have to play with RAS Mapper in 5.0, I just did not have the time these past couple of days. I will let you guys know. beej67, I found this great link. This I think does not need Arc-GIS...
  4. PKAST23

    Floodplain Mapping (HEC-RAS to CAD)

    Hi all, I am working on hydraulic modeling of a channel for CLOMR/LOMR project, HEC-RAS model and results look fine. Right now, I am working on mapping the 100 yr floodplain boundaries. I have done one in the recent past, where I look at the results table and draft the floodplain boundary at...
  5. PKAST23

    CLOMR Vs LOMR

    Thanks, cvg. Thats what I thought too. kinda of new to this. I should have said LOMR or CLOMR/LOMR in my question. One other question I have, Do I need to tie the model DS and US to a know FEMA cross section BFE? I only have topo good 300' US and DS of our site not beyond. FEMA sections are far...
  6. PKAST23

    CLOMR Vs LOMR

    I have pretty basic but important question. I would like to know if a CLOMR or CLOMR/LOMR is needed for a project. The site is an old mining pit next to a creek with Q100= 6,500 cfs on the north end. Mining stopped decades ago, the site now has thick brush, and trees. The topography shows the...
  7. PKAST23

    PE Exam

    My 2 cents Set aside at a minimum 2 1/2 months...try to study at least 2 hours on weekdays, and 5 on the weekends. Tab key chapters, sections etc (very important). If you are not feeling good about your preparation, then take the week off before the test day. You may be thinking thats a lot of...
  8. PKAST23

    Flow routing through multiple basins

    This project is in California, which lot of people think is not US anyways[dazed]. Just joking. I have used synthetic UH method using CivilD not Civil3D. This is a popular DOS based program accepted in Riverside County and other counties in Southern California. The watershed is 3 square miles...
  9. PKAST23

    Flow routing through multiple basins

    Spillway berms are protected with grouted rip-rap or with ArmorFlex blocks.
  10. PKAST23

    Flow routing through multiple basins

    The goal is to pass the entire Q100 safely pond after pond, not trying to attenuate the peak. All the basins are less than 50 ac-ft in volume and 15-20 feet high so looking at the chart in the link provided by cvg, it will not be considered a dam. I understand the need for basin routing analysis...
  11. PKAST23

    Flow routing through multiple basins

    The embankments are 15-20 feet tall and the spillway would be around 4-6 deep. You are right, about 4 feet is enough to convey around 4,000 cfs. For high frequency storms, the water would pond up and the culvert pipe would release a smaller peak allowing the ponded water to infiltrate. For 100...
  12. PKAST23

    Flow routing through multiple basins

    CVG&gbam The spillway berm/weir are up to 200 ft long with 4:1 slopes between the basins. This can convey 4,000 cfs with no issues, I think. The basin bottoms will have 0.5%-1% slopes and the berm downstream is lower in elevation than the one upstream, so I don't think there will be an issue...
  13. PKAST23

    Flow routing through multiple basins

    I am working on a flood control project where we are trying to route approx. 4,000 cfs (Q100) from mountainous watershed through a series of detention basins and then through a channel at the foothills. We are designing 4 basins with orifice control outlet pipes between the berms for low flows...
  14. PKAST23

    Flow Based Vs Volume Based BMPs

    I am not talking about detention here. Let me explain. The bio-retention basin treats the high frequency storm volumes and in case of low frequency storms i.e 10 yr and higher, we provide a outlet riser with grate inlet (can be sized for 100 yr Q) to drain the water to downstream storm drain...
  15. PKAST23

    Flow Based Vs Volume Based BMPs

    Yes, We use Volume based bio-retention basins in Riverside County CA with no infiltration option. Storm water gets treated in Engineered soil media under the basin and drains out through perforated PVC underdrain pipes. We do not used infiltration basins mostly because the soils here don't perc...
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