Answer: Hydrology is the scientific study of water on Earth, encompassing its occurrence, movement, distribution, and properties in all forms (liquid, solid, gaseous). As per the ONR-002 course material, it's an interdisciplinary science vital for understanding and managing Earth's water resources and their interaction with the environment. ### The Hydrologic Cycle The hydrologic cycle, or water cycle, is the continuous movement of water on, above, and below the Earth's surface. Primarily driven by s...

Answer: This problem involves fundamental hydrological calculations to determine the water balance components of a catchment during a rainfall event. We are provided with rainfall data, catchment characteristics, and observed outlet discharge. By applying key hydrological principles, we will quantify the amount of runoff generated, identify the portion of rainfall that did not contribute to runoff (losses), and assess the overall hydrological response of the catchment through its runoff coefficient. The...

Answer: Water balancing is the fundamental principle in hydrology that applies the law of conservation of mass to water within a defined control volume or hydrological system. It essentially states that over any given period, the total amount of water entering a system must equal the total amount of water leaving the system plus any change in the amount of water stored within it. This principle ensures that all components of the water cycle are accounted for, providing a quantitative understanding of w...

Answer: The Normal Ratio Method is a widely used technique in hydrology for estimating missing precipitation data at a rain gauge station. This method is particularly suitable when the normal annual precipitation at the surrounding stations (also known as index stations) differs significantly, typically by more than 10%, from the normal annual precipitation at the station where data is missing. This method operates on the principle that the ratio of precipitation at a station to its normal annual prec...

Answer: Groundwater pollution refers to the contamination of subsurface water stored in aquifers, which are underground layers of water-bearing permeable rock or unconsolidated materials. This occurs when harmful substances, originating from human activities or natural processes, infiltrate the ground and reach the water table. These pollutants can significantly alter the physical, chemical, and biological quality of the groundwater, rendering it unsuitable for various designated uses such as drinking, ...