Category: Hydrology

Posts about runoff, groundwater, infiltration, RDII etc

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

This page has very good graphics on LID and SuDS http://www.aquafluxus.com.br/bmp-lid-suds-wsud-e-infraestrutura-verde-praticas-que-revolucionam-a-drenagem-urbana/ By Ana Caroline Pitzer Jacob Posted 29 de outubro de 2015 In Drenagem Urbana, Qualidade da Água, Recursos Hídricos A urbanização […]

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)

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 […]

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 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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

Texas Capital Adopts InfoWorks ICM for Comprehensive Stormwater and Flood Modeling

Press Room | Products | News | Events | The Company   Texas Capital Adopts InfoWorks ICM for Comprehensive Stormwater and Flood Modeling City of Austin Gains Greater Efficiency and Operational Flexibility by Implementing Integrated Catchment Management Solution Broomfield, Colorado, […]