08/06/2026
Geophysical Survey Report (PQWT-M100)
đź“ŤGlendale, Mashonaland Central
# # # 1. Survey Overview
* **Equipment Used:** PQWT-M100 Natural Electric Field Frequency Selection Water Detector.
* **Parameters:** Lines (L = 12), Sites (N = 9), Gain (+0).
* **Data Visualization:** The upper section shows the profile curve chart (voltage/frequency variations across measurement points 1 to 8), and the lower section displays the corresponding 2D resistivity/potential difference contour map from 0 to -100 meters.
# # # 2. Data Analysis & Interpretation
In PQWT data interpretation, groundwater potential is generally indicated by **low-value anomalies (blue/cyan zones)** and **V-shaped or U-shaped downward convergences** in the curve profiles, which represent geological fractures, weathered layers, or fault zones where water accumulates.
Looking at the contour map and curves 0m to -30m (Shallow Layer):** This zone shows a very prominent, low-value blue/cyan layer. This indicates a highly conductive layer, likely representing topsoil, high moisture content, or a shallow, weathered aquifer.
* **-30m to -90m (Middle Layer):** This zone transitions into a higher-value yellow zone, indicating more compact, resistive bedrock (e.g., granite or unweathered rock) with low water potential.
* **Point 6 Anomalies:** Around **Point 6**, there is a distinct downward dip/V-notch in several of the upper profile curves. On the 2D contour profile, a subtle, lower-value tongue/gradient juts slightly into the yellow zone near the **-45m to -55m** mark at Point 6. This suggests a localized fracture zone or structural weakness in the bedrock.
# # # 3. Recommendations
Based on the analysis, the following drilling recommendations are proposed:
| Priority | Recommended Drilling Location | Target Depth Range | Expected Geological Feature |
| :--- | :--- | :--- | :--- |
| **Primary Target** | **Point 6** | **55 meters to 65 meters** | Bedrock fracture/fissure zone |
| **Alternative Target** | **Point 4** | **25 meters to 35 meters** | Shallow weathered zone/aquifer interface |
# # # 4. Reasons for Recommendations
* **Why Point 6?**
The curves directly above Point 6 exhibit clear convergence and downward dipping. This corresponds to the localized variation in the contour profile at depths around -50 meters. Drilling here targets a potential water-bearing fissure or fault within the rock structure. To ensure you completely cross this structural anomaly, drilling should extend slightly past it to a depth of **60–65 meters**.
* **Why the Shallow Depth Alternative (Point 4)?**
If deep bedrock drilling is not feasible or if the region is known for highly productive shallow perched aquifers, the transition zone between the blue and light-green layers at Point 4 (around 30 meters depth) shows steady low-resistivity values, indicating a stable moisture-bearing horizon.
> **Important Note:** While PQWT equipment is highly effective at locating structural anomalies and relative moisture zones, it measures electrical potential differences. It is always recommended to cross-reference these findings with local borehole data and regional geological maps before drilling.
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