Longer-term SPI values, particularly SPI-6 and SPI-12, reflect accumulated precipitation deficits that affect reservoir storage, groundwater recharge, and river flows. Prolonged negative SPI values indicate declining water availability and counter measures can be implemented. The multi-timescale capability of SPI enables water resource managers to distinguish between short-term meteorological deficits and longer-term hydrological drought, supporting informed decision-making for sustainable water resource management.

Short-term SPI values (SPI-1 to SPI-3) are strongly correlated with topsoil moisture availability and agricultural drought. Agricultural planners and farmers use SPI to guide planting decisions, schedule irrigation, and anticipate crop yield reductions. During drought events, SPI helps agricultural authorities identify affected areas, plan drought relief subsidies, and implement irrigation protocols prior to irreversible crop wilting points. The spatial mapping of SPI across agricultural regions enables targeted intervention and resource allocation.

Persistent positive SPI values across multiple timescales indicate soil saturation and reduced infiltration capacity, increasing the likelihood of runoff and flooding during subsequent rainfall events. When SPI-1, SPI-3, and SPI-6 collectively show positive anomalies, this signals sustained wet conditions with elevated flood risk. This multi-timescale approach supports early warning systems for flood preparedness and response, enabling authorities to monitor catchments as they become progressively saturated and responsive to rainfall events, and to issue timely flood warnings to vulnerable communities.

Landslides are frequently triggered by the accumulation of rainfall over extended periods rather than individual storm events. SPI-3 and SPI-6 capture antecedent moisture conditions that progressively saturate soil profiles, reducing shear strength and increasing the susceptibility to slope failure. Longer-term SPI values identify periods when soil moisture conditions are approaching critical thresholds. This early warning capability supports risk assessment and preparedness measures, particularly during the inter-monsoon periods when heavy, localised convective rains are most frequent and slopes are most vulnerable to failure.