This book compiles a broad range of monitoring and early warning technologies focused on high-resolution in-situ water quality parameters at springs and monitoring wells. The surface collapses often cause severe damage to infrastructures, properties, and loss of lives, whereas contaminated groundwater poses risks to human health and the environment. Collapses are critical in karst systems, sparsing a seventh of Earth’s land surface. Karsts are also very relevant for drinking water, yet kar...