|
|
 |
|
|
 |
|
|
|
Automated
Design for New Sewer Systems
H2OMAP Sewer delivers advanced design
functionality allowing users to quickly and reliably design
new sewer collection systems that consider standard design
criteria such as flow depth-to-pipe diameter ratios, velocity,
slope, soil cover depth, and pipe crown drop. Using user-input
manhole locations, H2OMAP Sewer calculates
the optimal pipe size and slope, invert elevation of conduits
and manholes, soil cover depths at both ends of each pipe
section, and cost of excavation and reinstatement to meet
target design criteria. Results can be reviewed using
profile plots, color coding of sewer maps, or comprehensive
tabular reports. They can then be automatically updated
in the model database, simplifying the model building
process.
Population Based Peaking Curve
H2OMAP Sewer provides several approaches to
peak flows for steady state analysis and design simulations.
The modeler could choose equation based peaking approaches
(e.g., Federov equation, Harman and Babbitt equation)
or curve based peaking approaches. Two peaking curves
are available, flow based peaking curve and population
based peaking curve. Using the flow based peaking curve,
one can supply peak flows as a function of base flows.
The population based peaking curve represents peaking
multiplier as a function of number of population served.
This is a method of choice if the modeler wishes to use
different peaking equations depending on the number of
population.
|
 |
|
 |
| (Click
to enlarge the picture) |
|
|
|
| |
The
Colorado Urban Hydrograph Procedure
The Colorado Urban Hydrograph Procedure (CUHP) uses the
equations and procedures presented in the Urban Drainage
Criteria Manual (USDCM) of the Urban Drainage and Flood
Control District (UDFCD). These equations relate the hydrograph
parameters to catchment properties to determine shape
of the CUHP. |
 |
| |
 |
|
|
| (Click
to enlarge the picture) |
|
|
|
| |
Infiltration
Losses
During storm events, some of the rainfall is
lost in the form of infiltration and depression/retention
storage depending on soil type, land use, and topographic
conditions of the modeled catchment. H2OMAP
Sewer/Pro estimates part of rainfall that is lost in the
form of infiltration (Horton's method) and depression/retention
storage, and uses the resulting effective (excess) rainfall
to determine runoff hydrograph.
|
 |
Dynamic Water Quality Modeling
The purpose of the dynamic quality model is to simulate
hydrogen sulfide generation, degradation and release
in both gravity and pressure mains; rates of microbially-induced
corrosion; sediment transport and deposition; time
of concentration; biochemical oxygen demand; pollutant
loading and buildup, as well as individual domestic,
commercial and industrial contributions, and transport.
Seven different state-of-the-art types of quality
analyses can be carried out by H2OMAP
Sewer and are explained below.
|
 |
Hydrogen Sulfide
Hydrogen sulfide is the most common odorous
gas found in municipal wastewater collection and
treatment systems. Colorless, emitting a characteristic
odor of rotten eggs, the gas is extremely toxic
and can lead to significant corrosion problems,
pipeline collapses, and even loss of human life.
H2OMAP Sewer allows users to readily
model and analyze entire sewer collection systems
for sulfide generation and corrosion potential under
varying conditions anticipated throughout the life
of their systems. It enables them to pinpoint odor
and corrosion problems, develop effective monitoring
programs, alert plant operators and sewer maintenance
workers to potential danger and the need to observe
safety practices, and implement the most effective
control system. (The most common methods for control
of hydrogen sulfide are ventilation and scrubbing,
and chemical injection.) Users can evaluate alternative
pipeline profiles to minimize turbulence, low velocities,
long retention times and other hydraulic conditions
that promote sulfide buildup. They can also analyze
the impact of diversions, future flows, and changes
in wastewater characteristics before potentially
costly decisions are made.
Corrosion Predictor
Corrosion is one of the primary reasons that existing
sewer systems lose their structural integrity. Corroded
sewer pipes may allow greater inflow and infiltration
into the collection systems, further deteriorating
their reliability by causing undesirable phenomena
such as surcharges and overflows, ultimately requiring
premature capacity augmentation or pipe replacement.
Corrosion of unprotected concrete or metal surfaces
is primarily due to the production of sulfuric acid
in sewer systems through oxidation of hydrogen sulfide
gas by bacterial action on the exposed surfaces
under aerobic conditions. Corrosion Predictor (H2OMAP
Sewer Pro) lets you readily model and analyze your
entire sewer collection systems for corrosion potential
under varying conditions anticipated throughout
their useful life. It enables you to pinpoint corrosion
problems, specify corrosion resistant materials
or select other forms of corrosion protection (e.g.,
protective linings).
Time of Concentration
H2OMAP Sewer can model the changes in
the age of sewage flow (time of concentration) throughout
a collection system. Time of concentration is the
time spent by a sewage flow parcel in the network
(i.e., the time of flow in the sewerage system).
This parameter is useful to address important water
quality and safety issues such as generation of
sulfide that may occur in a sanitary sewer system,
which manifest itself in corrosion and odor issues.
Source Tracing
H2OMAP Sewer can perform sophisticated
source tracing calculations. Source tracing tracks
over time what percent of sewage reaching any pipe
or manhole in the network had its origin at a particular
source node. The source node can be any manhole
in the network, including wet-wells. Source tracing
is a useful tool for tracking changes in sewage
flow contribution (and associated constituents)
over space and time such as predicting the impact
of industrial and commercial waste discharges at
the treatment plant or within the collection system.
Pollutant Transport
H2OMAP Sewer can effectively simulate
the transport of dissolved pollutants throughout
the sewer collection system. It tracks the movement
of conservative constituents (e.g., chloride, bromide,
sulfate, boron, sorbed trace metals) flowing through
the network over time. The dynamic water quality
simulation model is predicated on solving both mass
continuity and advective transport based on diffusion
wave analogy. This capability is useful in determining
the dynamics of blending characteristics and the
impact of contaminants on receiving waters.
Biochemical Oxygen Demand
Biochemical Oxygen Demand (BOD) is the most widely
used parameter of organic pollution in sanitary
sewer systems. H2OMAP Sewer models the
rate of BOD oxidation (exertion) throughout the
collection system using first-order kinetics with
the rate of oxygen utilization being proportional
to the difference between the amount of oxygen used
and the ultimate BOD.
Sediment Deposition and Transport
Sanitary sewer systems can carry substantial loads
of suspended solids (waste solids). These sediments
can collect causing blockages (shock loading under
periods of low flow) and overflow events, as well
as impairing the hydraulic capacity of the sewer
pipes (by restricting their flow area and increasing
the bed friction resistance). H2OMAP
Sewer can simulate the transport and gravitational
settling (deposition) of sediments (total suspended
solids including grit) over time throughout the
sewer collection system under varying hydraulic
conditions. |
Automatic Manhole Invert Comparison
When constructing a Collection System model directly
from GIS data, it is necessary to check all of the
invert data for potential mistakes and/or oversights.
The new Invert Comparison Tool allows you to do
just that. Each manhole is automatically evaluated
and the difference between the highest incoming
invert elevation and the lowest outgoing invert
elevation is calculated and stored as a manhole
attribute in the open structure database table.
You can then automatically highlight any manholes
with invert differences greater than a specified
tolerance or color-code and/or annotate all manholes
based on the invert differential. In addition, any
manholes that are outside your specified tolerance
are automatically flagged for your review. |
Wet Weather Modeling (H2OMAP Sewer Pro)
During peak storms, excessive wet weather
flow conditions created in the sewer collection
system may lead to hydraulic surcharge of the pipes
and even flooding of homes and basements. H2OMAP
Sewer Pro can model critical flows resulting from
rainfall events under both steady state and dynamic
simulations. Peak runoff resulting from a single
rainfall event can be computed using the widely
recognized Rational Method based on
any Intensity-Duration-Frequency curve,
or using optimized Synthetic Unit Hydrographs
(including Soil Conservation Service dimensionless
unit hydrograph, SCS triangular unit hydrograph,
and tri-triangular unit hydrograph). A complete
runoff hydrograph resulting from single or multiple
event rainfalls is generated and dynamically transported
along with associated sanitary flows using the highly
efficient Muskingum-Cunge flow routing model that
expeditiously solves a simplified form of the Saint
Venant’s equations.
|
|
|
| SCS
Dimensionless Unit Hydrograph |
SCS
Triangular Unit Hydrograph |
|
|
|
| Superimposition
of Hydrographs |
Tri-triangular
Unit Hydrograph |
|
 |
|
|
| (Click
to enlarge the picture) |
|
|
|
Pumps in Parallel
H2OMAP Sewer allows you to model multiple
pumps in parallel, each pump with its own characteristic
curve and speed setting. The on-off status and speed
setting of each pump can be controlled by time (time
into the simulation), wet-well levels or volumes.
|
 |
Flow/Hydrograph Attenuation (Dynamic Wave)
Flow attenuation in a sewer collection system is
the process of reducing the peak flow rate by redistributing
the same volume of flow over a longer period of
time as a result of friction (resistance), internal
storage and diffusion along the sewer pipes. The
magnitude of attenuation depends on parameters such
as the peak discharge, the curvature of the hydrograph,
and the width of flow. H2OMAP Sewer uses
a distributed Muskingum-Cunge flow routing method
based on diffusion analogy, which is capable of
accurately predicting hydrograph attenuation or
peak flow damping effects (peak subsidence). |
Network Review/Fix Tool
The Network Review/Fix Tool is a comprehensive
network drawing examination
and correction application for
use in constructing reliable, credible working
models ready for analysis. It offers users
complete functionality to quickly identify
and automatically correct any network topology
problems (e.g., disconnected nodes) and data
flaws (e.g., duplicated pipes or nodes) that
may arise from digitizing a model or building
it using pre-existing GIS and CAD datasets.
The Tool consists of many useful applications
including:
Locate Nodes in Close Proximity (Overlapping/Duplicate
Nodes)
Nodes in close proximity designate nodes that
overlap (accidentally duplicated) as shown
in the figure below. The Network Review/Fix
Tool allows the user to instantly view every
node in close vicinity of another node (based
on any specified distance) and automatically
merge the identified nodes into one where
necessary.
|
 |
Locate Pipe-Split Candidates
Pipe-split candidates represent separate pipe
sections that should be connected by a common
node as depicted in the figure below.
|
 |
The Network Review/Fix Tool allows the user
to rapidly locate all pipe-split candidates
in the network that are within a specified
distance of their end nodes and automatically
make the connection where appropriate.
Locate Crossing/Intersecting Pipes
Crossing pipes refer to those pipes that cross
but do not intersect at a common node as shown
in the figure below.
|
 |
The Network Review/Fix Tool allows the user
to rapidly view all crossing pipe candidates
in the network and automatically create the
intersection where necessary.
Locate Orphan Pipes
Orphan pipes are pipe sections which have
no end (terminal) nodes. The Network Review/Fix
Tool allows the user to quickly locate all
the orphan pipes in the network model and
automatically add junction nodes at their
endpoints as shown in the figure below.
|
 |
Locate Superimposed/Duplicate Pipes
Duplicate pipes are superimposed/parallel
pipes that share the same curvilinear shape.
The Network Review/Fix Tool is able to rapidly
identify all duplicate pipe candidates in
the network model. The user can then determine
if a parallel pipe actually exists and, if
so, re-route (redraw) the pipe in a noticeable
manner or remove/delete it from the model
if such a duplicate pipe does not actually
exist as shown in the figure below.
|
 |
Locate Disconnected Nodes
Disconnected nodes are stray nodes (i.e.,
are not connected to any pipe) that are separated
from the rest of the network as shown in the
figure below.
|
 |
The Network Review/Fix Tool allows the user
to quickly locate and highlight all junction
nodes in the network that are not connected
to any pipe. The user can then choose to connect
those junctions to the system or remove them.
Trace Network
The Network Trace function launches a spanning
tree to identify all pipes and nodes in the
network that can be reached from any specified
location (source node) via a connected path.
The source node does not need to be a tank
or reservoir. This function allows the user
to instantly view all portions of the network
model that are disconnected from any node
as shown in the figure below. The user can
then easily determine if a hydraulic connection
actually exists and, if so, make the connection
in the model.
|
 |
|
Field Calculator and Field
Statistics
Powerful Field Calculator and Field Statistics
GIS features give you complete flexibility in manipulating,
interrogating, querying, and managing your GIS data.
You can now perform sophisticated spreadsheet type
operations (add, substract, multiply, divide, etc.)
on your numerical data as well as complex statistics
(minimum, maximum, average, summation and standard
deviation).
|
 |
|
|
Manage
GIS Data Using Sophisticated Field Calculator
and Field Statistics Features
(Click to enlarge the picture) |
|
|
|
Complete ArcSDE/Geodatabase
Compatibility
Using highly advanced GIS connectivity applications,
H2OMAP Sewer now fully supports ArcSDE
8.1, ArcSDE versioning and ArcSDE Direct Connect
Support. These enhanced GIS capabilities will allow
you to manage geographic information in one of four
commercial databases: IBM DB2, Informix, Microsoft
SQL Server, and Oracle, as well as being able to
serve ESRI's file-based data with ArcSDE for Coverages.
ArcSDE serves spatial data to the ArcGIS Desktop
(ArcView, ArcEditor, and ArcInfo) and through ArcIMS,
as well as other applications and it is the key
component in managing a multi-user spatial database.
|
 |
|
|
| (Click
to enlarge the picture) |
|
|
|
For existing users of H2OMAP
Sewer Suite, go to the Update
or Download page
to obtain the latest software updates. For all new
users, these features will be included when you
receive your software. |
|
|
|
|
