A CASE STUDY ON CERAMIC INDUSTRY OF BANGLADESH.pptx
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Analysis of Groundwater/Surface Water Interaction at the Site Scale Babcock Ranch Community Development Lee County, Florida
1. Analysis of Groundwater/Surface Water
Interaction at the Site Scale
Babcock Ranch Community Development
Lee County, Florida
E.J. Wexler, P.J. Thompson
G.F. Rawl, Dirk Kassenaar
IAH-CNC 2015
Waterloo, ON
November 4, 2015
2. Babcock Ranch Development
Groundwater/Surface Water Interaction â Babcock Ranch 2
ï Land purchased in 1914
ï Located on Florida west coast
ï Straddles Lee and Charlotte Counties
ï Babcock Ranch City to have 45,000
residents
ï First fully solar-powered city in U.S.
4. Babcock Ranch Location
Groundwater/Surface Water Interaction â Babcock Ranch 4
ï Site located north of
Caloosahatchee River near
Ft. Meyers, FL
ï Telegraph Swamp is a key
wetland feature
ï Sold to state in 2006 as a
Nature Preserve
ï 1100 km2 Study Area
includes Babcock Ranch,
Telegraph Swamp and
subwatersheds to either
side
Babcock
Ranch
Model Boundary
Callosahatchee River
Telegraph
Swamp
5. Conceptual Plan
Groundwater/Surface Water Interaction â Babcock Ranch 5
ï 19,500 homes concentrated in
âdevelopment podsâ.
ï Four residential villages and
five hamlets
ï Other light industry and
commercial
ï 50% of developed area to be
left as nature reserve
6. Drainage Plan
Groundwater/Surface Water Interaction â Babcock Ranch 6
ï Runoff from developed areas
directed to stormwater lakes
ï Overflow to wetland preserves
ï Some runoff directed to treatment
marshes
ï Aggregate mines converted to
larger stormwater lakes
ï Remaining discharge to streams
going offsite
ï Seepage from stormwater lakes
re-hydrates wetlands
7. Lee County Settlement Agreement
Groundwater/Surface Water Interaction â Babcock Ranch 7
ï Lee County concerned about wetlands and possible flooding in Telegraph
and Trout Creek downstream of Babcock Ranch.
ï Wanted proof that stormwater management system will restore more
ânaturalâ (pre-settlement) conditions
Telegraph Creek
8. Modelling Approach
Groundwater/Surface Water Interaction â Babcock Ranch 8
ï Integrated model needed to simulate
groundwater-fed wetlands and ET
ï Earthfx built an integrated GW/SW
model for:
ï âCurrent Conditionsâ
ï âPost-developmentâ conditions - increased
imperviousness and stormwater
management
âȘ âNatural Conditionsâ â all ditches, berms,
mines, roads removed
ï Compare infiltration, storm flow,
groundwater recharge, heads, and
wetland hydroperiod under each
scenario.
GSFLOW Code used for integrated Model
9. GSFLOW Code
Groundwater/Surface Water Interaction â Babcock Ranch 9
ï GSFLOW is a USGS code developed for
integrated GW/SW modelling
ï Based on MODFLOW-NWT and PRMS
(Precipitation-Runoff Modelling System)
ï Fully open-source, proven and very
well documented
âȘ PRMS submodel handles soil moisture
accounting and groundwater recharge
âȘ Groundwater submodel provides water to
soil zone in areas of shallow water table
ï Groundwater/surface interaction
simulated for lakes and streams PRMS Submodel in GSFLOW
10. Grid and Development Plan
Groundwater/Surface Water Interaction â Babcock Ranch 10
ï PRMS submodel was used
as a distributed model
ï Calculates soil water
balance for each
100 x 100 m cell.
ï Same grid used for
MODFLOW submodel
ï Overland runoff routed
between cells using
cascading flow
ï Runoff can re-infiltrate
downslope PRMS Submodel in GSFLOW
11. PRMS Submodel Parameters
Groundwater/Surface Water Interaction â Babcock Ranch 11
ï Four general categories:
âȘ Topography
âȘ Soil Properties
âȘ Land Use/Vegetation
âȘ Climate
ï Topography from LIDAR
and USGS data
âȘ Total elevation change: 55 ft
ï Soil properties from
mapping
âȘ % impervious, vegetation
type, CN values, cover
density based on land
use/cover mapping
Topography
12. PRMS Soil Mapping
Groundwater/Surface Water Interaction â Babcock Ranch 12
ï Grouped into 9 categories
âȘ Mostly fine sand, but poorly
drained â B/D soils
âȘ Muck/Organic soils in
wetlands
ï High runoff during wet
season (May-September)
due to high water table
ï Better drained in dry
season (October-April)
Soils
13. PRMS Land Cover
Groundwater/Surface Water Interaction â Babcock Ranch 13
ï FLUCS data
ï Natural cover is mainly
wetland, upland forest,
and rangeland
ï Agriculture is the primary
land use
âȘ Limited urban development
in south
ï Cover type modified for
âpost-developmentâ and
ânaturalâ conditions
Land Use
14. PRMS Rainfall
Groundwater/Surface Water Interaction â Babcock Ranch 14
ï Rainfall shows wet-season/dry
season variation
ï Rainfall also shows year-to-year
variation
ï Averages about 1370 mm/yr
Annual Rainfall
Monthly Rainfall
NEXRAD
15. PRMS PET
Groundwater/Surface Water Interaction â Babcock Ranch 15
ï ET is very high year-round
ï Averages about 1323
mm/yr
ï Nearly matches average
rainfall
Annual PET
Monthly PET
16. PRMS Results
Groundwater/Surface Water Interaction â Babcock Ranch 16
ï PRMS outputs daily values for Precipitation, Interception, ET,
Hortonian and Dunnian runoff, fast/slow interflow, infiltration,
and recharge
ï Easier to look at Monthly Averages
Daily Rainfall WY2006
20. PRMS Results
Groundwater/Surface Water Interaction â Babcock Ranch 20
August 2007 2007 GW Recharge - Natural
(Less RO, more ET)
August 2007 GW Recharge (after ET) â Post
(Less GW recharge due to impervious)
22. MODFLOW Calibration Targets
Groundwater/Surface Water Interaction â Babcock Ranch 22
ï 13 significant streams
ï 10 gages with 2-4 years
continuous data
ï 505 wetlands represented
in current model
ï Structures at Curry Lake
and Telegraph Swamp
ï All agricultural ditches and
berms represented
Wells
23. MODFLOW Calibration Targets
Groundwater/Surface Water Interaction â Babcock Ranch 23
ï 155 wells with water level
data
ï Most are in surficial aquifer
ï All have 2-4 years of
continuous data
ï Shallow wells in wetlands
used as surrogates for
wetland stage
Surface Water Features
25. Post-Development Features
Groundwater/Surface Water Interaction â Babcock Ranch 25
ï 130 Storm Water Ponds
ï 130 Wetland Preserves
ï 12 Treatment Marshes
ï 121 Structures
ï Added code to GSFLOW to
calculate stage/discharge for
weirs, gates, and orifices
Surface Water Features
26. GSFLOW Submodel Results
Groundwater/Surface Water Interaction â Babcock Ranch 26
ï Groundwater model outputs daily values for heads, lake
stage/volume, stream stage/discharge.
ï Data can be analyzed to determine hydroperiod.
ï Calibration can be done to average heads or to hydrographs
Daily Rainfall WY2006
31. GSFLOW Results
Groundwater/Surface Water Interaction â Babcock Ranch 31
ï Best seen as animation.
ï Shows rainfall, heads,
streamflow, wetland and
lake depth
Click for Animation
32. GSFLOW Results
Groundwater/Surface Water Interaction â Babcock Ranch 32
ï Detailed daily water budgets for each
cell for all inflow/outflow components
ï Averaged for monthly and annual
conditions
ï Averaged by basin and sub-basins
ï Results compared with natural and post-
construction conditions
33. GSFLOW Results
Groundwater/Surface Water Interaction â Babcock Ranch 33
ï Simulated wetland
hydroperiod
ï Ranges between 120-365
days
ï Blue areas are 365 days
ï Results compared with
natural and post-
construction conditions
35. GSFLOW Prediction Results
Groundwater/Surface Water Interaction â Babcock Ranch 35
ï Simulated wetland stage under current, natural, and post-
development conditions â general improvement
Area 3
Area 1 (Curry Lake)
Area 2
36. Area 3
Area 1 (Curry Lake)
Area 2
Wetland Stage Hydrographs
Natural, Post-development, and Current Conditions
37. GSFLOW Predictive Simulations
Groundwater/Surface Water Interaction â Babcock Ranch 37
ï Simulated 5-yr, 25-yr and 100 yr storm at JEI-570 - Improved
5 year Storm
25 year Storm
100-year Storm
Natural
Post-Development
Currrent
ï 100-yr storm at JEI-570 under current, natural, and post-BRC conditions
38. Conclusions
Groundwater/Surface Water Interaction â Babcock Ranch 38
ï Integrated modelling is a
powerful tool for evaluating
natural and altered
hydrologic response
ï With sufficient data, very
good representations of the
groundwater and surface
water systems can be
obtained
ï Integrated models can
provide quantitative input
to land development/storm
water management studies
Questions?