Summer Flow of Large New York State Streams During Drought

During a dry summer, the flow of most large New York streams decreases significantly.

Drivers

• Reduced input: Less rainfall and diminished snowmelt recharge.
• Increased losses: Higher evaporation and plant transpiration.
• Groundwater decline: Baseflow contribution drops as aquifers recede.

Extreme Cases

Small tributaries may cease flowing entirely; larger rivers (Hudson, Mohawk, Susquehanna headwaters) shrink but typically maintain perennial flow due to reservoir releases and groundwater buffers.

Management

NYDEC monitors stream gauges; drought watches trigger water‑use restrictions (lawn watering, industrial withdrawals).