Revision history [back]
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initial version
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Syria - Well Yield Test - Adapted step test
Looking for criticism of this dumbed-down test to be conducted by non-technical crew in Syria. If test is passed the source (well/borehole) will be deemed candidate for install of low discharge pump (upto 6gpm).
Current Well Statistics
“Depth” being measured form top of well casing
Current demand on well – Cubic meters per day. During test phase this is termed Base Demand. Based on... Number and size of vessel, Pumping, if any – duration and discharge of pump(s)
Depth of well (meters) (meters)
Depth of pump intake (meters) (p)
Depth of surface of water in morning before water drawn (meters) (s). Static head is to be taken as (p-s)
Depth of water in evening (meters) (e). Daily drawdown is taken as (s)-(e)=(d)
Confirmation of Yield of Source – Adapted Step Test
Once the current yield has been established the following tests should be run. Note – it is assumed that water continues to be drawn at previous rate during the test. Thanks!
Test A. Pump water at same rate as Base Demand. Record water level every 15 minutes until Static Head(s) is 10m and then every 5 minutes. Stop pumping if less than 5m. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level in 15min intervals till level d (daily drawdown is reached). If “success” proceed to Test B
Test B. Pump water at twice Base Demand. Record water level every 15 minutes until (s) is 10m and then stop. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15m intervals till level d (daily drawdown is reached). If “success” proceed to Test c
Test C. Pump water at three times Base Demand. Record water level every 15 minutes until (s) is 10m then stop. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15min intervals till level d (daily drawdown is reached). If “success” proceed to Test D
If 3x Base rate is less than 25 liter/min then…
- Test D. Pump water at rate of 25 liters/min record level every 15 minutes until Static head is 10m and then every 5 minutes. Stop pumping if less than 5m. Stop pumping after one hour or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15min intervals till level d (daily drawdown is reached).
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retagged
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Syria - Well Yield Test - Adapted step test
Looking for criticism of this dumbed-down test to be conducted by non-technical crew in Syria. If test is passed the source (well/borehole) will be deemed candidate for install of low discharge pump (upto 6gpm).
Current Well Statistics
“Depth” being measured form top of well casing
Current demand on well – Cubic meters per day. During test phase this is termed Base Demand. Based on... Number and size of vessel, Pumping, if any – duration and discharge of pump(s)
Depth of well (meters) (meters)
Depth of pump intake (meters) (p)
Depth of surface of water in morning before water drawn (meters) (s). Static head is to be taken as (p-s)
Depth of water in evening (meters) (e). Daily drawdown is taken as (s)-(e)=(d)
Confirmation of Yield of Source – Adapted Step Test
Once the current yield has been established the following tests should be run. Note – it is assumed that water continues to be drawn at previous rate during the test. Thanks!
Test A. Pump water at same rate as Base Demand. Record water level every 15 minutes until Static Head(s) is 10m and then every 5 minutes. Stop pumping if less than 5m. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level in 15min intervals till level d (daily drawdown is reached). If “success” proceed to Test B
Test B. Pump water at twice Base Demand. Record water level every 15 minutes until (s) is 10m and then stop. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15m intervals till level d (daily drawdown is reached). If “success” proceed to Test c
Test C. Pump water at three times Base Demand. Record water level every 15 minutes until (s) is 10m then stop. Stop pumping after one hour = “success” or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15min intervals till level d (daily drawdown is reached). If “success” proceed to Test D
If 3x Base rate is less than 25 liter/min then…
- Test D. Pump water at rate of 25 liters/min record level every 15 minutes until Static head is 10m and then every 5 minutes. Stop pumping if less than 5m. Stop pumping after one hour or when level 2d (twice the daily drawdown) is reached. Measure level of rising water in 15min intervals till level d (daily drawdown is reached).
