AguaParaVivir

Strike the rock, and water will come out of it for the people to drink. - Exodus 17:6

Spring Catchment

The purpose of a spring catchment is to collect the spring water while protecting the spring from contaminants.  The team found that it would be impractical to construct a large catchment box on top of the eye of the spring because the box would have to be very large and the ground conditions are not suitable for such a structure.  Instead the team recommends that the structure, seen in the following figure, be constructed.

Spring Catchment

 

Two 15 foot trenches are to be dug forming a wide “V” shape.  The ditches are to be approximately 1.5 feet wide and deep enough that solid ground is reached.  Once complete, two 15 foot sections of 3 inch PVC drain tile are to be placed at the bottom of the trenches.  The two pipes are to be connected to each other with a “Y” connection.  On the upstream end of each pipe a cleanout is to be attached to allow for the removal of any sediment build up in the pipes.  This cleanout can be seen in the following figure.

Spring Catchment Cleanout

 

The two 15 foot pipes are to be covered with an 8 inch layer of rocks 3-8inches in diameter, followed by a 6 inch layer of gravel ½-3 inches in diameter and a 3” layer of sand.  The remaining depth is to be filled with the soil that was removed.  A drawing of the pipe covering can be seen in the following figure.

Drain Pipe Backfill

 

A third ditch is to be dug from the “Y” connection downhill to the edge of the muddy ground approximately 20 feet away. This can be seen above in the first figure.  A solid 3” PVC pipe is to be laid at the bottom of the third trench and covered with soil that was removed during the excavation.       

3" PVC Backfill

 

The team recommends that a third clean out be added to this section of pipe just below the “Y” connection.  The following figure shows the cleanout pipe and connection.

Spring Catchment Cleanout at the "Y"

 

A drainage ditch will need to be dug above the eye of the spring.  The drainage ditch will prevent contaminated runoff from entering the spring catchment and contaminating the water.  The drainage ditch should be dug about 4inches deep, 6-8 inches wide, and then filled with gravel.  See the following figure for a drawing of the ditch.

Spring Catchment Drainage Ditch