HYDROLOGICAL DESIGN
OF ARROYO ALAMAR:
VERTICAL ALIGNMENT
 

The Alamar Research Group

1.  VERTICAL ALIGNMENT

This document contains an approximate calculation of the volume of granular materials (sand and gravel) that could be extracted from the Arroyo Alamar project if the channel were to be lowered. The rational for lowering the channel has several purposes:

  • To increase the channel conveyance.

  • To extract sand and gravel and commercialize it to support the project development.

  • To enhance the aesthetics of the channel design.

Figure 1 shows the horizontal alignment of the channel design in Arroyo Alamar. A vertical bed-level profile was obtained with AutoCAD, and used to calculate the volume of cut (removal of sand and gravel) from the bed. Three cases were considered:

  • a. A uniform slope linking upstream and downstream end points (From Puente Cañon del Padre to Primera Etapa del Rio Tijuana).

  • b. A uniform slope at a depth of 1 m below the slope at a.

  • c. A uniform slope at a depth of 2 m below the slope at a.

Fig. 1   Arroyo Alamar:  Horizontal alignment.

Fig. 2   Arroyo Alamar:  Vertical alignment.

The following table summarizes the results of the analysis.

Level
(m)		Volume
(m3)
-0801,300
-11,575,700
-22,693,400

 

2.  SUMMARY

An analysis has been performed to calculate volumes of sand and gravel mining as a result of rehabilitation of Arroyo Alamar. Results indicate that up to 2.7 million cubic meters can be obtained from the channel bed of Arroyo Alamar by lowering it 2 m.

 
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