Category: Hydrology

Posts about runoff, groundwater, infiltration, RDII etc

Stormwater Runoff and the Rational Method in InfoSWMM and InfoSWMM SA

Stormwater Runoff and the Rational Method in InfoSWMM and InfoSWMM SA For storm sewer loading, the focus shifts to hydrologic analysis of excess precipitation and associated runoff. Common techniques for analysis include […]

InfoSWMM and InfoSWMM SA offer 13 choices for modeling surface runoff with Connections to Groundwater and #LIIDs

Surface Runoff in InfoSWMM and InfoSWMM SA InfoSWMM and InfoSWMM SA offer 13 choices for modeling surface runoff (click on link to see more information on each method): Nonlinear Reservoir The Colorado […]

AAEES 2017 Innovyze Excellence in Computational Hydraulics/Hydrology Award Presented to Dr. Qian Zhang

AAEES 2017 Innovyze Excellence in Computational Hydraulics/Hydrology Award Presented to Dr. Qian Zhang Broomfield, Colorado, USA, May 23, 2017 – Innovyze, a leading global innovator of business analytics software and technologies for […]

German Hydrology in InfoSWMM 14.5 and H2OMAP SWMM 14.5

German Hydrology in InfoSWMM 14.5 and H2OMAP SWMM 14.5 This blog describes how the German Runoff hydrology converts precipitation excess (rainfall and/or snowmelt less infiltration, evaporation, and initial abstraction) into surface runoff (overland […]

Example 8. Combined Sewer Systems from EPA SWMM5 Applications w/InfoSWMM

Example 8. Combined Sewer Systems from EPA SWMM5 Applications w/InfoSWMM This example demonstrates how to model systems that convey both sanitary wastewater and stormwater through the same pipes. Systems like these are […]

BMP, LID, SUDS, WSUD E INFRAESTRUTURA VERDE – PRÁTICAS QUE REVOLUCIONAM A DRENAGEM URBANA

This page has very good graphics on LID and SuDS BMP, LID, SUDS, WSUD e Infraestrutura verde – práticas que revolucionam a drenagem urbana By Ana Caroline Pitzer Jacob Posted 29 de […]

New – Five Infiltration Options Now in InfoSWMM v14 and H2OMap SWMM v14 for Watershed Modeling

Infiltration from the pervious area is a marvelous and from a runoff volume and runoff peak perspective a vital process in modeling the hydrology and ultimately the hydraulics of your Watersheds.  Figure […]

Water is good; it benefits all things and does not compete with them.(Lao-tzu)

I saw this website on LinkedIn and was interested in the use of Chinese and Japanese characters for water. http://www.flood-risk-bolivia.eu.pn/index.html

“The present research is supported by the Japan Society for the Promotion of Sciences (JSPS). The project began its research activities on November 2014. The logo selected is quite simple but meaningful. It consists on the map of Bolivia and inside the map it is the kanji for the word Shuǐ (Chinese) or Mizu (Japanese) that means water. The kanji looks like a drop water. It was decided to use the symbol of water, as everything relates somehow to water. Water is the most vital element for life, but it can also become the most destructive force.”
“Water is good; it benefits all things and does not compete with them.” (Lao-tzu)

Anyone else notice almost all the presentations come back to water? GIS is cool, but Water is cooler! #EsriEPC

Anyone else notice almost all the presentations come back to water? GIS is cool, but Water is cooler! #EsriEPC  Me: Runoff and Wastewater are also cool!— Adam Simonsen (@adamsimonsen) March 9, 2014 […]

The Life-Cycle of a Single Water Drop, in a Pop-Up Book Animated in Stop-Motion

From Maria Popova The Life-Cycle of a Single Water Drop, in a Pop-Up Book Animated in Stop-Motion by Maria Popova Nature’s rhythms in masterful paper engineering. Given my soft spot for pop-up books, I […]

The Internal Green Ampt Parameters, Soil Moisture and IMD for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

The Internal Green Ampt Parameters, FUMax, FU and FTOT or F for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM using a QA/QC […]

Initial Moisture Deficit or IMD for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

Rainfall and Losses One Watershed for a 100 Year Simulation with SWMM 5 Statistics at a saved time step of one hour.

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

Colorado’s Flooding Becomes A 1,000 Year Event As Rescuers Search For 500 Missing People

Colorado’s Flooding Becomes A 1,000 Year Event As Rescuers Search For 500 Missing People BY KATIE VALENTINE ON SEPTEMBER 15, 2013 AT 12:18 PM, http://thinkprogress.org/climate/2013/09/15/2621881/colorado-floods/ CREDIT: AP/Colorado Heli-Ops, Dennis Pierce Boulder County, Colorado is bracing for […]

3 Types of Subcatchment Flow in SWMM 5

Subject:   3 Types of Subcatchment Flow in SWMM 5   There are three types of Subcatchment flow in SWMM 5  1.   Impervious area with depression storage in which the runoff from the precipitation is delayed due to the depression storage.  Evaporation occurs based on the depth of water in the […]

Aquifers in SWMM 5

Subject:   Aquifers in SWMM 5   Groundwater in SWMM 5 is modeled as two zones: (1) Saturated and (2) Unstaturated.  The data for the Groundwater Simulation consists of physical data in an Aquifer and elevation and flow coefficient and exponent data in the GroundwaterData.  The Aquifer data object can […]

Infiltration Data in SWMM 5

Subject:  Infiltration Data in SWMM 5   If you are using Non linear Reservoir Modeling in SWMM 5 there are   1.   Five parameters for Horton Infiltration, 2.   Three parameters for Green-Ampt and 3.   Two parameters for CN infiltration, one parameter (conductivity) has been deprecated by the […]

Aquifer and Groundwater Objects in SWMM 5

  Subject:   Aquifer and Groundwater Objects in SWMM 5 There are two types of data objects in SWMM 5 to describe the Groundwater flow component.  There is a Groundwater data object associated with a Subcatchment that describes flow equations, the interaction between the Subcatchment infiltration and the Groundwater component and an Aquifer data […]

How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?

Subject:   How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?   This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious […]

How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?

Subject:   How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?   This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are:   ·         F or FTOT which is the cumulative event infiltration at the […]

How is Capillary Suction Head Used in SWMM 5 Green-Ampt?

Subject:   How is Capillary Suction Head Used in SWMM 5 Green–Ampt?   How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 Green–Ampt  infiltration method.   Figure         1 shows how the total infiltration loss and total loss rate vary as […]

How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?

Subject:   How is the Soil Saturated Conductivity Used in SWMM 5 Green–Ampt?   How sensitive is the infiltration loss and rate to the Soil Saturated Conductivity parameter in the SWMM 5 Green–Ampt  infiltration method.   Figure 2 shows how the total infiltration loss and total loss rate vary as […]

There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5

There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5: 1.   The fractional response to Rainfall or R from 0 to 1 2.   The Time Base of the Unit Hydrograph or T in hours * Dimensionless K Shape Factor 3.   The Sewershed Contributing Area in […]

How is RDII Storage Simulated in SWMM 5?

Subject:  How is RDII Storage Simulated in SWMM 5?   If you are using the SWMM 5 Rainfall Dependent Infiltration and Inflow(RDII)  feature you can also use the RDII storage parameters to change the RDII runoff by simulating the storage in the Sewershed.   The code in RDII.C as implemented […]

Types of Stormwater Inlets from HEC12 and HEC22

Note:  Types of Stormwater Inlets from HEC12 and HEC22   Stormwater Inlets consist of four main types (http://onlinemanuals.txdot.gov/txdotmanuals/hyd/storm_drain_inlets.htm) with most common shown in Figure 1.   1.   Curb opening inlets either at a sag or continuous on the street, 2.   Grate Inlets either at a sag or in combination with […]

How to Subdivide Subcatchments in SWMM 5

Subject:   How to Subdivide Subcatchments in SWMM 5   If you want to subdivide a larger Subcatchment in SWMM 5 and get around the same peak flow then a good suggestion would be to make sure that (Figure 1):   1.   The sum […]

Low Impact Development Options in H2OMAP SWMM and InfoSWMM

Subject:  Low Impact Development Options in H2OMAP SWMM and InfoSWMM   The five options are:   1.       Rain Barrel 2.      Bio Retention Cell 3.      Infiltration Trench 4.      Vegetative Swale 5.      Porous Pavement   and be entered as controls in the Hydrology Section of the Operations Browser of H2OMAP SWMM or InfoSWMM (Figure 1) […]

Rules for NRSCS Unit Hydrographs in InfoSWMM and H2OMap SWMM

Subject:  Rules for NRSCS Unit Hydrographs in InfoSWMM and H2OMap SWMM   Rules or Guidelines for NRSCS Unit Hydrographs if used as the Hydrology Option in InfoSWMM and H2OMAP SWMM: 1.       The Unit Hydrograph CN comes from the Subcatchment Table and the NRCS_CN Column 2.      Time of Concentration is from the TC column in […]

Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period

Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period   A poster at the recent ECI conference on the […]

Mass Balance for Water Quality in SWMM 5

Subject:   Mass Balance for Water Quality in SWMM 5   The rainfall concentration is listed in the wet deposition row of the Runoff Quality Continuity Table, the washoff such as EMC washoff is listed in the Surface Runoff row.  If you are […]

Convolution of the RDII UH from R, T and K in SWMM 5

Subject:  Convolution of the RDII UH from R, T and K in SWMM 5   The convolution uses the value of R and the Time Base to estimate the amount of Infiltration and Inflow in the Sewer Network.  The short, medium and long term UH‘s […]

How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?

Subject:  How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?   You can use the monthly soil recovery factor (Figure 1) in SWMM 5 to change how the Infiltration Maximum Time to Drain the Upper Soil Zone (Figure 2) is computed each month during a continuous simulation.    The  depth of the upper soil zone in the internal  SWMM 5 units of […]

SWMM 5 Precipitation Options

Subject:  SWMM 5 Precipitation Options   You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage […]

Sensitivity Analysis in InfoSWMM and H2OMAP SWMM

Subject:  Sensitivity Analysis in InfoSWMM and H2OMAP SWMM       It is easy to perform sensitivity analysis in InfoSWMM and H2oMAP SWMM using the Scenario Manager, Dataset manager, Block Edit in the Database Editor, Batch Simulation and theReport Manager.  For example, we will do […]

How is the Volume Calculated in the SWMM 5 Groundwater Component?

Subject:   How is the Volume Calculated in the SWMM 5 Groundwater Component?   The groundwater component of SWMM 5 is found in the gwater.c code.  It (as is all of SWMM 5) is excellently written in small functions by Lew Rossman […]

How is the Mass Balance Calculated in the SWMM 5 Groundwater Component?

Subject:   How is the Mass Balance Calculated in the SWMM 5 Groundwater Component?   The groundwater component of SWMM 5 is found in the gwater.c code.  It (as is all of SWMM 5) is excellently written in small functions by Lew Rossman of the EPA during the SWMM 5 development process.  However, code being […]

The Groundwater Flow Component in SWMM5

Subject:  The Groundwater flow in SWMM 5 Groundwater   The Groundwater flow in SWMM 5 is actually made up of three components:   1.   A groundwater flow computed from the coefficient a1 and exponent b1 2.   A groundwater flow computed from the coefficient a2 and exponent b2 and 3.   A Surface Water / Groundwater Interaction coefficient […]

Detention Pond Infiltration and Evaporation Losses in SWMM 5

Subject:  Detention Pond Infiltration and Evaporation Losses  You can also add a storage pond infiltration and surface evaporation losses to the pond.  The surface evaporation is added to theinfiltration (computed from the green ampt parameters); a storage volume summary listing the average and maximum volume and the percent loss from the […]

InfoSWMM 11 (for ArcGIS 9, 10) and H20MAP SWMM v10 Updated for the new SWMM 5.0.022 Engine

—————————————————— EPA SWMM 5 Build 5.0.022 (04/21/11) ——————————————————Engine Updates 1. The following fixes and updates were made to the LID module of the code (lid.c): a. The Drain Delay time for a Rain Barrel LID is now […]

Tributary Area to a Node in SWMM 5 or InfoSWMM

Note:  Tributary Area to a Node in SWMM 5 or InfoSWMM Here are the steps you neeed to take to calculate the tributary area of a node in InfoSWMM: Step 1:  Use the DB Editor to get the total area in your model using the Data Statistics Tool. Step […]

Drainage Wells or a Vertical Exfiltration Trench in InfoSWMM

Subject:  Drainage Wells or a Vertical Exfiltration Trench in InfoSWMM   Note, this is just one way to model an Exfiltration Trench.  The source for the image below is Rice Creek Watershed.    You can make a storage node to simulate the trench with […]

Pump / Force Main System in InfoSWMM and SWMM 5

Subject:  Pump / Force Main  System in InfoSWMM and SWMM 5   The basic system consists of:            Wet Well and its associated physical parameters,          Pump Type          Defined Pump Curve,          Downstream […]

How to change the Maximum Infiltration in a DB Table of InfoSWMM and H2OMAP SWMM

Note:  How to change the Maximum Infiltration in a DB Table of InfoSWMM and H2OMAP SWMM   There are a lot of methods in InfoSWMM and H20MAP SWMM to change the infiltration data.  You have the ability to change it for   1.      an individual subcatchment using the Attribute Browser 2.      by soil type and 3.      the […]

The Time Base is T + T*K from the Time(T) and Storage (K) values for RDII in SWMM5

Note:  Each of the RDII UH’s has a base time for the convolution of the RDII from each UH.  The Time Base is T + T*K from the Time(T) and Storage (K) values  used in the RTK data.  In […]

SWMM 5 Aquifer has a Saturated and Unsaturated Zone

Note:  The unsaturated upper zone soil moisture varies between the initial upper zone moisture fraction to the porosity fraction for the soil.  The soil moisture content is for the SWMM5 Aquifer which can cover more than one Subcatchment in your simulation […]

SWMM5 Runoff and Depth Relationships

Note:  The surface runoff is a non linear function of the independent depth in both the pervious and impervious areas of the subcatchments.   No surface runoff occurs until the depth over either the impervious or pervious area is greater than […]

SWMM5 Groundwater Flow Components

Note:  There are three sub flow components in the calculation of the groundwater flow from a SWMM 5 Subcatchment.    1st Component: Flow = Groundwater Flow Coef. * (LowerDepth – Aquifer Bottom to Node Invert) ^ Groundwater Flow Exponent   2 nd Component: Flow = SurfaceWater Flow Coef. * (Aquifer Bottom to Water Surface – Aquifer Bottom to […]

SWMM 5 Subcatchment Runoff and Depth Relationship

Note:  The surface runoff is a non linear function of the independent depth in both the pervious and impervious areas of the subcatchments.   No surface runoff occurs until the depthover either the impervious or pervious area is greater than […]

What are the LID Control Flow Source Options in SWMM 5?

What are the LID Control Flow Source Options in SWMM 5?   The SWMM 5 options for Low Impact Development (LID) controls on a Subcatchment are very flexible, exciting, possibly recursive and a completely integrated method to treat both the pervious and impervious flow.  You can […]

The relationship between the rainfall, total losses from the previous area, evaporation and infiltration only rate for SWMM 5

Subject:  The relationship between the rainfall, total losses from the previous area, evaporation and infiltration only rate.   The total loss from a subcatchment pervious area is the sum of the evaporation + infiltration loss.  Typically the evaporation rate is much less than the infiltration rate. SWMM 5 now has too options – evaporation during only dry periods or evaporation during both wet and dry periods.   Figure […]

Increase in heavy rainfalls over past 60 years in upper Midwest, US

Increase in heavy rainfalls over past 60 years in upper Midwest, US http://www.sciencedaily.com/releases/2013/03/130313182312.htm March 14, 2013 Mar. 13, 2013 — Heavy rains have become more frequent in the upper Midwest over the past […]

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