Spring Yield Measurement

Spring Dry Season yield measuring procedure:

• Spring yield Measurements are taken in dry season of the year: February to April
• The main purposes of the spring yield measurement and recording of all the information are:

• To know the spring water sustainability;
• To enable accurate design;
• To record data about the spring.

• Materials required for spring Yield measuring are :

• GPS/GPS App for Smartphone: To record the location of spring.
• Water collecting apparatus: to collect all the waters easily and without any leakage.
• Containers: to measure the Volume of spring water source
• Stopwatch: to measure the time it take to fill them.

• Spring yield measurement methods:

• Clean and excavate the spring site, by involving Water Agent (WA) and Water User Association (WUA) members.
• Use proper container size:

• Utilize a 3 liter volume jar for measuring yields at a rate of up to 0.2 liters per second.
• Use 10 liter volume jar to measure yields up to 2 liters per second.
• Utilizing 20 liter volume jar to measure yields more than 2 liters per second

• Measurement :

• Carefully collect all the waters in to the measuring Jar.
• Make sure No water can leak or flow out from the jar.
• Start timing as soon as the container is placed under the flow (be fast).
• Stop timing as soon as the container is full
• Yield = Container volume (L) / Time (s)
• Take three time yield measurements. Consider the average of 3 measurements: (variation should be < ±20%.
• Complete the format WD1-F16:

Measurement of Uncapped spring

• Find the best location a bit down from the spring (where all water flows in one direction) to place the measuring apparatus and gather all the water into it.
• Dig carefully to place the measuring apparatus.
• Cover the side of the apparatus with muddy clay to prevent leakage.
• Extend the pipe with HDPE to put the measuring container to the safe place.

Remember that

Do not use local materials to measure the yield such as banana leaf and tree coverages for these reasons :

• All water is not collected.
• There is high leakages during the measurement.
• There is yield difference when we measure with local materials and with measuring apparatus.

Therefore, For uncapped spring yield measurement must use the measuring apparatus described above.

Exceptional : For small spring or where it is impossible to dig, local materials (banana, leaves) can be expetionnaly used to collect the water toward the pipe

Measurement of Spring built by government

To measure the yield of capped spring with government design :

• Remove caps from the drainage.
• Close the outlets of the line to the water point.
• Directs all the water into the drainage,
• Then using measuring materials mentioned above just we measure the yield.

Additional materials required during this time is pipe wrench to remove taps frim drainage pipe.

In case of Some springs capped by Government have no drainage pipes:

• Just go to the reservoir and measure the yield at the reservoir inlet.

Sometimes springs are not fully capped, in this case:

• Measure the capped part at the drainage,
• Measure uncapped parts with the method describe for uncapped springs.
• Then, the final spring yield results will be the sum of all the yields.

Measurement of spring yield built by PROCEED

The design of capped springs built by PROCEED is easy and simple to measure spring yield :

• Just going to spring box and open the door.
• Remove overflow pipes only in the spring box.
• And going to over flow protection structures and measure the yield.