Lake Sidney Lanier Watershed

lameubiquityMechanics

Feb 21, 2014 (3 years and 6 months ago)

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US Army Corps of Engineers

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Understanding Sedimentation and
Land Use Cover Relationships in the
Lake Sidney Lanier Watershed

Russell A. Lundstrum

Natural Resources Specialist, Park Ranger

Lake Sidney Lanier, Buford Dam

MGIS Program, Pennsylvania State University

Capstone Project

July 2009
-

February 2010

Rev. 7


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Lake Sidney Lanier


Located 60 miles north of
Atlanta, GA


Buford Dam built in 1952


Filled to full pool in 1957


Over 15,000 adjacent
land owners


10,000 private docks


Source of drinking water
for 3.5 million people


Over 7.5 million visitors to
the lake annually

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Lake Level Action Zones


Above 1071’:

Flood Water Storage

Zone 1:

Normal Operation

Zone 2:

Reduced Hydropower, Limited Navigation

Zone 3:

Reduced Hydropower, Severely Limited Navigation

Zone 4:

Hydropower at Minimum, Little/No Navigation

Below 1035’:

Unable to Generate Power, “dead storage”

http://water.sam.usace.army.mil

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Vital Statistics


692 miles of shoreline


39,038 acres of water


17,726 acres of land


41 USACE parks


10 Marinas


10,000+ Boats


13 County and City Parks


6 State Parks

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Apalachicola
-
Chattahoochee
-
Flint
River Basin (ACF)

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Upper Chattahoochee Watershed

9 counties

1,034 square miles

60 square miles of that
is the lake itself

2,240 miles of streams*

3,909 miles of roads**

*USGS NHD dataset

**TeleAtlas 2009

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Research Questions


How has land use changed in the
watershed?


How much sediment has accumulated in
Lake Sidney Lanier?


Is there a correlation between sediment
accumulation and land
-
cover change in
the Lake Sidney Lanier watershed?


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Study Area Selection


44 Sub
-
watersheds Drain
to Lake Sidney Lanier


4 Selected, Based On:


Sufficient Sedimentation
Range data


Max. Accumulation


Max. Erosion


No Change


Visual Analysis of Land
Cover Change


New Neighborhoods


More Roads


Forested Areas

Longwood Cove, Lake Sidney Lanier

130,000 cubic yards of silt removed

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Sediment Affects…


Recreation


Wildlife


Water Supply


Water Quality

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Sub
-
watershed Study Areas

404

801

804

808

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Study Area Summary

USGS HUC ID:

404

801

808

804

Size (acres)

14,795

15,806

13,356

16,642

Location

North end
-
Gainesville

North end
-
Gainesville

Southwest
-
Cumming

Southeast
-
Flowery Branch

Sedimentation
Ranges

5

4

3

4

Docks

856

1,199

850

707

Limited Development*
(acres)

517 (4.6%)

600 (3.8%)

535 (4.0%)

373 (2.2%)

Protected*
(acres)

506 (3.4%)

668 (4.2%)

266 (2.0%)

507 (3.1%)

Recreation*
(acres)

125 (0.8%)

849 (5.4%)

476 (3.6%)

516 (3.1%)

*USACE Allocation Zones

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Data Discussion


Land cover


Georgia Land Use Trends (GLUT, University of
Georgia, Athens, GA)


Collected 1974, 1991, 2005


Sedimentation Range


Cross section bathymetric surveys


Located in various creeks impounded by the reservoir


Three data sets: 1956, 1983, 1990

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Land Cover

Beaches, Dunes, Mud

Open Water

Low Intensity Urban

High Intensity Urban

Clear cut, Sparse

Quarries, Strip Mines

Deciduous Forest

Evergreen Forest

Mixed Forest

Row Crops and Pasture

Forested Wetland

Non
-
forested Wetland
-
Fresh

Sub
-
watershed HUC 808

Cumming, GA, 1991

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Data Discussion


Land cover


Georgia Land Use Trends (GLUT, University of
Georgia


Collected 1974, 1991, 2005


Sedimentation Range


Cross section bathymetric surveys across lake


Located in various creeks impounded by the lake


Three data sets: 1956, 1983, 1990

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SR#33A Survey, 1990

Sedimentation

Ranges

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Significant Dates for Project Data


1956 Sedimentation Range Survey, Baseline


1957 Lake Lanier filled to full pool



1974 Georgia Land Use Trends Cover


1983 Sedimentation Range Survey



1990 Sedimentation Range Survey


1991 Georgia Land Use Trends Cover



2005 Georgia Land Use Trends Cover

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Methods

Land cover change


Visual analysis


Raster analysis


Impervious surfaces


Forested areas


Urban/suburban
areas


Sediment Range


Drastic increases or
decreases in sediment


Identify areas that have
certain characteristics


Strong increase


Strong decrease


No change


How do the land cover and sediment range data correlate?

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Research Relevance


Effect of silt on lake operations


Reduces hydropower capacity


Minimal impact


Effects recreation, wildlife


Shallow water in marinas


Turbid water in creeks and coves


Can impact flood storage


Estimated $2 billion in real estate
between Buford Dam and Peachtree
Creek



Effects municipal water supply


Reduces water storage capacity


Diffuser pipes become clogged


Additional water treatment for turbid water
(minimal on this lake)

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Research Relevance


Effect of silt on lake operations


Reduces hydropower capacity


Minimal impact


Effects recreation, wildlife


Shallow water in marinas


Turbid water in creeks and
coves


Can impact flood storage


Estimated $2 billion in real estate
between Buford Dam and Peachtree
Creek



Effects municipal water supply


Reduces water storage capacity


Diffuser pipes become clogged


Additional water treatment for turbid water
(minimal on this lake)

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Research Relevance


Effect of silt on lake operations


Reduces hydropower capacity


Minimal impact


Effects recreation, wildlife


Shallow water in marinas


Turbid water in creeks and coves


Can impact flood storage


Estimated $2 billion in real
estate between Buford Dam
and Peachtree Creek



Effects municipal water supply


Reduces water storage capacity


Diffuser pipes become clogged


Additional water treatment for turbid
water (minimal on this lake)

Flooding in Mableton, GA, September 2009

Map of home value below Buford Dam

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Research Relevance


Effect of silt on lake operations


Reduces hydropower capacity


Minimal impact


Effects recreation, wildlife


Shallow water in marinas


Turbid water in creeks and coves


Can impact flood storage


Estimated $2 billion in real estate
between Buford Dam and Peachtree
Creek



Effects municipal water supply


Reduces water storage capacity


Diffuser pipes become clogged


Additional water treatment for turbid water
(minimal on this lake)

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Timeline


2009


July
: Research Started


August
: Proposal Rough Drafts


September
: Online Proposal Presentation


October:
Start Research Analysis


November
: GIS Day Presentation


December:

Continue Research Analysis



2010


January
: Draft Analysis Findings


February 9
-
11
: Final Presentation, USACE South Atlantic Division
Ranger Conference in Savannah, GA


March:
Project Revisions


April
: Final MGIS Wrap
-
up


May 15
: Graduate


June
: Present Documents and Research Findings to USACE

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Thank you for your time!

Questions?