A graphical view of the nonlinear runoff processes in ICM SWMM, ICM InfoWorks (SWMM Hydrology), InfoSWMM and SWMM5

Nonlinear runoff processes in SWMM5

1. Three runoff surfaces

a. Impervious with Depression Storage

b. Pervious with Depression Storage

c. Impervious without Depression Storage

1. Slope (same for all runoff surfaces)
2. Width or the Dimension of the Subcatchment (same for all runoff surfaces)
3. Infiltration a. Horton b. Modified Horton c. Green Ampt d. Modified Green Ampt e. Curve Number or SCS or CN f. Monthly Adjustments for Climate Change for all Infiltration Methods
4. Evaporation a. Constant b. Time Series c. Monthly d. Temperature e. Climate File f. Monthly Adjustments for Climate Change
5. Roughness (Manning’s n) a. Impervious b. Pervious
6. Depression Storage a. Impervious b. Pervious
7. Temperature for Snowmelt a. Climate File b. Time Series c. Monthly Adjustments for Climate Change
8. Wind Speed for Snowmelt a. Climate File b. Time Series
9. Other connected processes a. LID Controls b. Groundwater c. Snowmelt d. Water Quality
10. Outlet a. Node b. Pervious Runoff Surface c. Impervious Runoff Surface d. Another Subcatchment e. LID Controls i. Rain Garden ii. Green Roofs iii. Porous or Permeable Pavements iv. Bio Retention Cells v. Infiltration Trench vi. Vegetative Swales vii. Rain Barrel viii. Rooftop Disconnection
11. Rainfall a. Design Storms b. Historical Storms c. Long term NWS data or a Climate File d. User Time Series e. Monthly Adjustments for Climate Change

Immerse yourself in the vibrant, non-linear world of runoff processes SWMM5, where every drop of rain and every grain of soil tells a story of hydrological complexity. ???????

Explore the Runoff Realm: Your journey begins with the varied landscapes of runoff surfaces, each with its own character:

• The hard, storage-savvy impervious surfaces ???
• The absorbent, life-giving pervious grounds ??
• The slick, unyielding impervious zones without depression storage ???

Navigate the Terrain: Traverse slopes identical across terrains and witness how width shapes the subcatchment's hydrological response. ?????

Infiltrate the Infiltration Puzzle: Decipher the infiltration enigma with methods ranging from Horton to Green-Ampt, each nuanced by climate change's monthly adjustments. ?????♂?

Evaporation - Nature's Algorithm: Engage with evaporation, nature's algorithm, modulated by constants, series, and even the rhythm of the seasons, all under the watchful eye of climate change. ????

The Roughness Factor: Feel the surface beneath your feet, from the sleek impervious to the textured pervious, each with its unique roughness coefficient. ??♂???

Depression Storage - Nature's Reservoirs: Discover the pockets of storage across your urban and natural landscapes, critical in the initial interception of rainfall. ?????

The Chill of Snowmelt: Brace against the chill of snowmelt, guided by temperature readings and wind speeds from climate files or time series, all fine-tuned for a changing world. ?????

The Web of Water Processes: Weave through the intricate web of connected water processes, from LID controls that mimic nature to the groundwater's silent flow, the transformation of snow to water, and the dance of water quality constituents. ????

Where Waters Flow: Follow the water as it journeys to nodes, pervious surfaces, other subcatchments, or through LID controls like rain gardens and green roofs, each a story of ingenuity and design. ?????

The Drama of Rainfall: And finally, gaze skyward to the drama of rainfall, from design storms to historical patterns, enriched by long-term data and user-created sagas, all under the shadow of climate change. ?????

This is the mosaic of runoff processes in SWMM5—a symphony of hydrological phenomena waiting for you to conduct its performance. ??????

Closing Note: Thank you so much for journeying with me through this content. This space is reserved for future updates and insights. Your engagement and time are truly appreciated. Until next time!