Tanks

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Big Picture

Goals

  • Determine if a tank is needed
  • If needed, provide the documentation needed for assessment and construction of any tanks.

Tasks

  • Have members read EWB guidelines on structures and cement. (Tanks members)
  • Find tank members. (Charlie & Becca). Do after deciding if tanks are needed.
  • Decide if tanks are needed (Agua Group)

Questions

  • Do they want tanks?
  • What benefits will a tank provide?
    • If they only run their ram pumps during the day, then running them during the night to fill tanks would increase their supply.
    • Scott Nelson has proposed an idea using a control valve, manifold, and drip irrigation that would negate the need for storage. The system would direct water to different zones in a given field removing the need to shift sprinklers around.
    • Tanks will be needed to lower the pressure for drip irrigation.
  • Does the project meet the folowing?
    • Benefit the entire community and will not discriminate against members of the community.
    • Meet the needs of the present without compromising the ability of future generations to meet their own needs.
  • How often do they run the ram pump?
  • How long does it take to water a unit area with a ram pump?
  • Where can a tank be placed?
  • How much head will be needed for any irrigation system, standard or drip?

Other Questions, not necessarily related to tanks

  • Ask Gregorio, the co-ops and families if they think the manifold option would work and if they would support it. If not, find out what they envision would work best.
  • Request tours of farms that already have micro-irrigation systems in place.
  • Visit micro-irrigation vendors in Chimaltenango/Guatemala City to see what equipment is available and get prices.
  • On testing ram pumps
    • Will either Don Gregorio or Don Guyo be able to work with us while we are doing the testing?
    • Can the pump owners be notified in advance before we start working on their pumps? Can we work on their pumps without them being present?
    • How do you stop and start the pumps?
    • What size is the outlet check valve and pipe -1/2 inch, 3/4 inch or 1 inch?
    • How are the delivery hoses attached to the pumps? What problem would we encounter removing them?
    • What kind of hose connections are there at the field sprinklers?
    • Can the ram pump be adjusted or tuned when we test them at a higher pressure?
    • Are there any parts that could potentially break when we test the pumps?

Potential mentors

  • John Buzek, jrbuzek@comcast.net. Structural engineer. Note: Will be leaving in May for two years.
  • Peter Daniels, civil/environmental primarily in wastewater. pdaniels99@gmail.com. Note: Cannot attend Tuesday until mid-March.

The Details

Construction

Timeline

Process

Site Prep

Drains

Floor

Walls

Roof

Valve Box

Finalizing

Resources

Materials

Materials for Concrete Tank

Equipment

Pricing

Operation and Maintenance

Sustainability

Design

Mix Design

Calculations

Drawings/Opening

Mapping

References

  • Simajhuleu-PBTank Design. The wiki paged used for the design of pressure break tanks in Simajhuleu.
  • Water Quality for Agriculture. "Peter Waugh suggested during our conference call that we checkout "Water Quality for Agriculture," FAO irrigation and drainage paper #29 document for our water assessment. It appears to be a very comprehensive document that covers soil toxicity and drip irrigation clogging. He brought up a salinity/sodium absorption ration, SAR, as one parameter to measure. I've read in other literature that salt is very damaging to agricultural soil."
  • Free AutoCAD Tutorial. The team will use AutoCAD and Pro/Engineering to illustrate the designs for the dams. This is a Free Tutorial they will use to learn the CAD software.