Glacial water balance. We are interested in knowing when water is accumulating within a glacier, when it is steady, and when it is losing water. Kennicott Glacier is 40 km long and 4 km wide. The average (water-equivalent) melt rate at the glacier surface over the melt season is 5 cm/day, as measured using ablation stakes. Water discharge is also measured at the terminus of the glacier.

• Estimate what the discharge of water should be, in m³/s, when the water outputs from the glacier equal the water inputs.