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The Woodlands - a Totally Planned Community
The community was designed as if it were fully developed with minimal impacts on water.
Strict requirements were made about land use and natural drainage concepts were used throughout.
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Guadalupe River Map
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Guadalupe River Facts The Guadalupe River valley artifacts suggest that
the area has supported human habitation for several thousand years.
The steady flow from the springs that feed the Guadalupe and its tributaries have made the river an attractive source of waterpower. Very high quality water source.
Major water supply and recreational river now May become major source for San Antonio - in the
near future
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Environmental Hydrology Surface water supply and delivery systems (sewers) Ground water for supply, wells, and springs Contamination and environmental quality issue
– Lake and Coastal Bay quality studies– River quality for drinking water and recreation– Hazardous waste studies for GW contamination– Waste sources from urban/industrial runoff
Land use impacts from urban development Disaster mitigation and flood control
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T.S. Allison – June 9, 2001
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Runoff in an Urban Basin Rain falls over watershed A portion becomes pipe flow
(storm water). The remaining portion
becomes overland flow in streets and yards.
The total runoff reaches a stream and is the sum of both components
Total Hydrograph
Pipe Flow
Overland Flow
Out
flow
Time
Pipe Flow(SWWM)
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Harris Gully Watershed
Rice Blvd.
Shepherd
Greenbriar
Main St
.
Fannin
Montrose
Kirby
Harris Gully
Richmond
Westheimer
Bissonnet
Rice Blvd.
Shepherd
Greenbriar
Holcombe
Main St
.
Fannin
SW Freeway
Montrose
Kirby
Rice University
Texas Medical Center
Harris Gully
BraysBayou
Rice Blvd
Harris Gully
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Digital Elevation ModelBased on 1999 Aerial Survey
DEM Used to Determine Overland Flow Connectivity and Storage
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Existing Pipe Network
2-15’x15’
2-11.5’x15’
7.5’x11’
90”
60”
72”
6.5’
x10’
66”
60”
60”
72”
60”6.
5’x1
0’
66”
72”
96”
114”
54”
84”
Hermann Park
TMC
Rice
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Hydraulic Calculation - Pipes
Energy Grade Line
Datum (MSL)
Flow
z1
P1
z2
P2
hL
(z + P/ + V2/2g)1 = (z + P/ + V2/2g)2 + hL
E = total energy = z + P/ + V2/2g at pts 1 and 2
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Harris Gully Drains to Brays Bayou
Low Flow Box Culvert During Tropical Storm Frances
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Bayou Camera - June 8-9, 2001Provided valuable data on water levels and timing
10 p.m. 12 p.m. 11:00 a.m
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Texas Medical Center - Moursund Westbound6/10/01 - 6:44 AM
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Rice Blvd at Entrance 16 looking west
Jeep indicating high water mark - inlet to Harris Gully
T.S. Allison - Houston, June 9, 2001
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T.S. Allison vs. the 100-year(Inches of rainfall)
1-hr 3-hr 6-hr 12-hr
1976 TMC 3.8 7.5 9.8 10.4
Allison (a) 4.3 10.3 12.1 14.7
100-yr (b) 4.6 6.8 8.5 10.5
Diff (a–b) –0.3 3.5 3.6 4.2
Note: Allison dropped 8.5 inches in 2 hours