Introduction:
The statement is true. The base of the non-recording type rainfall gauge is permanently fixed in the concrete block. In this response, we will discuss the reasons behind this statement and explain the concept of non-recording type rainfall gauges.

Non-Recording Type Rainfall Gauges:
Non-recording type rainfall gauges are used to measure the amount of rainfall at a specific location. These gauges are simple and economical, making them suitable for various applications. They consist of a container or a funnel that collects the rainwater and a measuring cylinder or a graduated container to measure the collected water.

Permanently Fixed Base:
The base of the non-recording type rainfall gauge is permanently fixed in a concrete block. This is done for several reasons, including stability, accuracy, and durability.

Stability:
By fixing the base in a concrete block, the rainfall gauge becomes stable and secure. It ensures that the gauge remains in place even during heavy rainfall or strong winds. The concrete block provides a solid foundation for the gauge, preventing any movement or displacement.

Accuracy:
The accuracy of rainfall measurements is crucial for various applications such as hydrological studies, weather forecasting, and water resource management. By fixing the base in a concrete block, the gauge remains in a fixed position, minimizing any errors or discrepancies in the readings. This is important to ensure consistent and reliable rainfall data.

Durability:
Rainfall gauges are exposed to various weather conditions, including rain, sunlight, and temperature fluctuations. By fixing the base in a concrete block, the gauge is protected from physical damage and degradation. The concrete block acts as a shield, preventing any direct contact with the ground and providing long-term durability.

Conclusion:
In conclusion, the statement is true. The base of the non-recording type rainfall gauge is permanently fixed in a concrete block. This is done to ensure stability, accuracy, and durability of the gauge. The fixed base provides stability during adverse weather conditions, accuracy in rainfall measurements, and long-term durability against physical damage.