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Our Mission: To alleviate the flooding within the school, the park, and the surrounding neighborhood of El Recreo.
Topographic Map |
El Recreo Stormwater Drainage
Santa Cruz, Bolivia
International Senior Design
August 2006
Ambassador Engineering
Project Manager Nicholas Darga
Project Engineer Erik Moore
Project Engineer Nicholas Link
Background
Bolivia is a country in the middle of South America. Bolivia has a tropical climate that consists of two seasons, rainy and dry season. The rainy season occurs from November thru February.The city of Santa Cruz de La Sierra is located in low lands approaching the Amazon basin. Santa Cruz de la Sierra is the largest city in Bolivia. The population growth has been problematic for city planners because of industrialization. This has made flood control difficult for city officials to keep up with. Since the entire city is relatively flat, draining the storm water during the rainy season is a challenge. The tax structure in Bolivia limits the amount of funds received by local neighborhoods. A limited amount of tax money gets back to the outer neighborhoods due to this hierarchy.
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Existing
Conditions
- An earthen canal east of the school.
- Concrete culvert from Drain Road to the 6th Ring Road Canal.
- The standing water hinders foot and vehicle traffic along Roads 1 and 4.
- During peak rainy season 700 students and 40 homes are impacted.
- Flooding may be a health hazard because most homes use the hole system burying fecal matter underground.
- E. Coli and coli forms were detected in onsite water. These bacteria pose a health threat to people wading through the flood waters. Malaria also exists in the area.
- Current earth canals are blocked with litter and other
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Gathering Data
Research of previous year’s projects and engineering solutions was completed. Previous ISD storm water project reports were read while in Bolivia and information was organized for later use.
- A topographical survey was conducted.
- AutoCAD generated a model of the existing topography.
- Ambassador Engineering evaluated the soil in the barrio.
- A soil auger was used to test material make up.
- Three areas were tested to the depth of the water table.
- Samples of the soils were taken and classified.
- Water testing was preformed.
- Water sample and brought it to Sauguapac.
- 3M E.coli and Fecal Chloroform Tests resulted positive.
- Interviews were conducted. Interviews were conducted in person with:
- Public Works Officer of District 10, Sr. Horacio Cardenas
- Barrio President, Sr. Domingo Cuasace A.
- Senior Engineer, Simon Murley EIT ,SME
- Owner and Senior Engineer, Richard E. Prince P.E., ABG Engineering
- Principle and Owner, Thomas J. Darga, Interlake Associates, ABG Engineering
- Ambassador Engineering studied rainfall data.
- Calculate watershed run off.
- Photographs of the barrio were taken documenting layout.
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El Recreo Park
Existing Outlet
Soil Boring
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Existing Outlet
6thRing Canal
Meeting with Barrio President
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Alternatives |
Underground Pipes
Inlet Structure & Sediment Trap |
Underground Pipes
Advantages
- Not intrusive
- Low cost of maintenance
- Constructability
Disadvantages
- Relocate school septic
- More expensive than earthen canals
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Roads and Pipe Combination
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Roads and Pipe Combination
Advantages
- The neighborhood planned to pave Road 4 for traffic improvement.
- Material from Road 4 grading used as fill for the park flooding.
- Diverts flow under school.
- Routs all water directly towards 6thRing Canal.
Disadvantages
- Using roads to convey storm water induces erosion.
- Driveway access must be designed to maintain curb depth.
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Canals
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Canals
Advantages
- Low initial cost
- Constructability
Disadvantages
- High cost of maintenance
- Dangerous to children
- Canals aesthetic unappealing
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Cost
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Recommendations
Road and Pipe combination
- More cost effective in the long run because the road has two functions.
- Avoids health hazards
- Non intrusive
- Solves the Stormwaterproblems of Recreo
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