Site Scale Module

The site scale tool features all the components of the full scale tool, but has been designed for selecting and design a stormwater control measure for an individual site.  The site-scale tool work flow includes:

• Hydrology module
• SCM Selection module
• Water quality module
• Sizing module
• Cost module

The Hydrology Module:

• Simulates land surface runoff
• Generations a runoff depth and hydrograph
• Event or continuous simulation
• Includes multiple routines for simulating infiltration and evapotranspiration

SCM Selection Module:

• Select a SCM based on the pollutants in the watershed’s land use and region
• Leverages a database of performance to choose the SCM with the best pollutant removal
• Preliminary cost estimate determines which SCMs are infeasible
• User-weighted decision criteria helps you choose the final SCM that is best for your site

Water Quality Module:

• Determines treatment within SCM based on the design
• Explicitly models physical treatment processes (settling, decay, etc.)
• Uses different routines for each pollutant
• Separate algorithms for infiltration and storage-based SCMs

Sizing Module:

• Uses hydrologic and water quality criteria to size BMPs to reach specified management goals
• Size storage-based BMPs for peak flow reductions
• Size infiltration-based BMPs for volume reductions
• Water quality goals…

Cost module:

• Quantifies capital and life cycle costs of each SCM using cost curves
• Costs vary with SCM volume
• Life cycle components include construction, land acquisition, operation and maintenance, rehabilitation, and administration
• Includes regional adjustment factors