Hydrologic Information System

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Hydrologic Information System
Analysis, Modeling, Decision Making
Arc Hydro Geodatabase
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GIS Preprocessors for Hydrologic Models
Interface
GIS
Model 1
Database
Model 2
Model 3
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Connecting Arc Hydro and Hydrologic Models
Interfacedata models
GIS
HMS
Geo Database
Arc Hydro data model
RAS
WRAP
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Nexrad Map to Flood Map in Model Builder
Flood map as output
Model for flood flow
HMS
Model for flood depth
Nexrad map as input
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Arc Hydro Implementation Projects

• LCRA
• Arc Hydro geodatabase for Llano Basin
• Interface geodatabase model for HEC-HMS
• Experiments with LibHydro on Llano Basin
• SARA
• Arc Hydro geodatabase for Salado and Rosillo
  Creeks
• Interface geodatabase model for RAS (partly)
• Map to map application using Model Builder

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LibHydro

• A Fortran subroutine library of hydrologic
  processes developed from HEC-1
• Packaged in LibHydro.DLL for operation under
  Visual Basic
• Transforms input time series to output time
  series
• More details on GISHydro 2003 CD

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Excess Calculation

• Initial Loss and Constant Loss Rate function

Pick up a watershed HydroID 2346
ImperviousAreaRatio 0.0001 InitialLoss
1.6 (mm) ConstantLossRate 0.38 (mm)
Simulation Period 7/21/97 7/23/97 (3 days)
Time Interval 15 minutes Time step 4
24(hour) 3(days) 288
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Runoff Calculation

• Snyder Unit Hydrograph

Pick up a watershed Watershed area 266.5
(km2) SnyderCp 0.8 SnyderTp 5.58 (hr)
Simulation Period 7/21/97 7/23/97 (3 days)
Time Interval 15 minutes
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Outflow Calculation

• Add Baseflow module
• Outflow runoff baseflow
• Recession Ratio 0.95, Threshold value 2 (m3/s)

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Schematic Network

• Standard Arc Hydro data structure
• Schematic Links
• Schematic Nodes
• Type 1 Nodes and Links for Watersheds
• Type 2 Nodes and Links for Streams
• Type 3 for ..

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Schematic Network Processes

• Node processes
• Rainfall-runoff and pollutant loads on watersheds
• Summing flows or loads on streams
• Water quality in water bodies
• Link processes
• Routing flows in streams
• Pollutant losses in streams

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Looping Through the Schematic Network
See GISHydro2003 CD for details
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Schematic Network Process Implementation
Geodatabase
GIS
Script (ProcSchematic.vbs)
ArcToolbox Script Tool (ProcessSchematic)
DLL(MBSchematic.dll)
Script and DLLs
Process DLL 1
Process DLL n
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Regional Flood Control, Drainage, and Storm Water
Management Program
Partners in San Antonio
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San Antonio River Basin
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Interlocal Agreement Coverage Area
Watershed Area Sq. Mi. Population
Cibolo Creek 204 97,000
Leon Creek 235 278,000
Medina River 290 83,000
Salado Creek 222 349,000
San Antonio River 270 582,000
Salado
Leon
Cibilo Creek
San Antonio River
Medina
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Prototype Application

• Rosillo/Salado Creek watershed
• Arc Hydro geodatabase developed for full Salado
  Creek watershed
• TAMU and UT developed Arc Hydro-compliant,
  model-specific geodatabases for Rosillo Creek
• HEC-HMS
• HEC-RAS
• Utilizing interfaces currently under development
  (PrePro2000/HEC-GeoHMS, HEC-GeoRAS)
• Successfully linked the Rosillo Creek and Salado
  Creek models for HEC-HMS and HEC-RAS applications

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Flood Alert / Flood ForecastingFlood Modeling
and Forecasting

• Coordination has begun with NWS River Forecast
  Center
• Update river forecasting to 1 hour (currently 6
  hours)
• Evaluating flash flood forecasting for smaller
  watersheds
• Evaluating integration of NEXRAD data into the
  proposed system