A research team of hydrologists is attempting to understand the role of a series of ponds and bogs on the regional hydrologic water balance. The long term objective is to determine which of the surface water bodies are permanent and which may diminish significantly in the event of long term drought. The immediate objective is to assess which surface water bodies are points of recharge and which are points of discharge, and to make calculations of the monthly and annual gains or losses to the groundwater systems. Outline a field measurement program that would satisfy the immediate objectives at one pond.