QHM is a Windows-based continuous watershed quantity and quality simulation model intended for watershed management and stormwater design. The program can also be used as an effective teaching tool. Most applications have been watershed analysis usually related to selection and sizing of stormwater BMPs, particularly, flow control and treatment ponds. QHM offers an important planning and design tool to watershed managers and designers of stormwater quantity and quality control systems.

QHM is capable of continuous simulation of:

• Surface runoff and base flow
• Detention pond routing
• Reservoir routing
• Soil freeze-thaw
• Snowmelt and snow removal/disposal
• Evaporation and evapotranspiration
• Pollutant generation and routing
• Stream erosion potential