Understanding Colors in PQWT Ground Water Detector Profiles - A Guide by Sona Solar Zimbabwe

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At Borehole Experts Zimbabwe in partership with Sona Solar Zimbabwe, we understand the importance of clean water access. 

Ground water detectors are valuable tools in locating water sources, but interpreting the data they produce can be challenging. This guide focuses on deciphering the colors in PQWT ground water detector profiles, helping you gain valuable insights.

Demystifying the Color Bar:

The right side of the profile displays a color bar representing different resistivity values. Red indicates lower resistivity (less conductive), while blue signifies higher resistivity (more conductive). 

Each color block has a corresponding number reflecting the range of resistivity it represents. 

Understanding Colors in PQWT Ground Water Detector Profiles - A Guide by Sona Solar Zimbabwe

The topmost number represents the maximum value on the profile.

Color: Not a Direct Water Indicator:

Importantly, the color itself doesn't directly pinpoint water. The value each color represents changes based on the maximum value in the profile. A high maximum value can shift all colors towards blue, even if their actual resistivity remains unchanged.

Focus on Anomalies:

Look for abrupt changes in color or contour lines (reddish to blue or vice versa) rather than specific colors. These anomalies might indicate potential water zones. Analyze these anomalies alongside other factors like rock type and structure for a more accurate assessment.

Lithology and Water:

Rock composition (lithology) plays a crucial role. Bluish areas might suggest less favorable rocks with fewer fractures for water storage. However, localized blue zones within a red-dominant graph might indicate areas with increased fracture rates, potentially holding water.

Red Areas in Blue-Dominated Profiles:

Finding reddish areas within blue-dominant profiles can also be a good strategy. These areas might represent rock types with better water potential due to their different lithology.

Interpreting Gravel Layers:

The color of a gravel layer depends on the underlying formation. A reddish gravel layer might indicate shallow water within it if underlain by low-value mudstone. However, a gravel layer overlying high-resistance rock may appear bluish due to its water content and high porosity.

Maximum Value and Resistivity:

The maximum value on the color bar indirectly reflects the overall resistivity of the rocks. However, it can be influenced by factors like proximity to power lines. A higher maximum value pushes the value range of all colors upwards, including blue. Analyze both color and the corresponding value for a more complete picture.

Understanding White Areas:

White areas represent measured values of 0. This usually coincides with the dark blue color at the bottom of the bar (representing values close to 0). It's generally considered normal and doesn't affect other areas.

Black Diamond-Shaped Blocks (Flying Points):

Black-framed diamond or triangle shapes indicate points with unusually high values. These "flying points" are likely caused by interference and might disappear during retesting. They shouldn't be relied upon solely for well placement.

Interpreting Blue and Red Distribution:

Profiles with a large blue area on top and a red bias at a greater depth don't necessarily mean the upper section lacks water. Analyze the value of the blue area. If the value is very low, consider abandoning this measurement line. For crystalline rocks, finding relatively high-value points within the blue zone might indicate drilling locations in the more brittle and hard lithology of the weathering layer. Alternatively, if the red area below exhibits verifiable V-shaped anomalies, drilling might be considered assuming the anomaly is caused by the upper section influencing the lower section.

Interpreting ground water detector profiles requires a holistic approach. While color plays a role, consider resistivity values, anomalies, lithology, and potential interference factors like flying points. By understanding these elements, you can gain valuable insights from your ground water detector data.

Disclaimer: This guide is for informational purposes only. Sona Solar Zimbabwe is not a geological exploration company and does not endorse any specific ground water detector brand.

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