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University of Missouri-Columbia. Lake Morphology and Hydrology. Lakes of Missouri Volunteer Program. The. The Missouri Department of Natural Resources.

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lakes of missouri volunteer program

University of Missouri-Columbia

Lake Morphology and Hydrology

Lakes of Missouri Volunteer Program

The

The Missouri Department of Natural Resources

Region V11, US Environmental Protection Agency, through the Missouri Department of Natural Resources, has provided partial funding for this project under Section 319 of the Clean Water Act

slide2

Lake Morphology/Hydrology

    • Surface Area
    • Depth
    • Volume
    • Watershed Area
    • Flushing Rate
surface area

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Surface Area

Ranges from 6 to 53,814 acres in size, with a median of 103 acres.

slide4

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Surface Area of Classified Lakes

30% of classified lakes are 20 acres or less in size.

10% are greater than 300 acres in size.

depth determined by dam height
Depth(determined by dam height)
  • Surface Area
  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate
average depth

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Average Depth

Ranges from 3.7 feet to 62 feet, with a median of 11.6 feet.

why is depth important
Why is depth important?
  • Shallow lakes may mix sporadically throughout the summer, leading to more internal loading of nutrients.
  • A deeper lake has a larger volume of water, which influences hydrology.
lake volume determined by area and depth
Lake Volume(determined by area and depth)
  • Surface Area
  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate
lake volume

Lake Volume

Ranges from 48 to 2,700,000 acre-feet, with a median of 1,675 acre-feet.

1 acre

1 foot

1 acre-foot = 325,851 gallons

slide10

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Same inflow volume, different Lake Volume

Dam height and topography determine the lake volume

watershed area catchment size
Watershed Area(catchment size)
  • Surface Area
  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate
watershed area

Watershed Area

Ranges from 83 to > 4,000,000 acres, with a median of 2,516 acres.

slide13

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Same size lake, but with different inflow volumes

Inflow is determined by the watershed area and rainfall

flushing rate
Flushing Rate
  • Surface Area
  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

- the proportion of the total lake volume that is replaced (per year) by inflowing water.

Flushing Rate = Regional Runoff Coefficient * Watershed Area / Lake Volume

flushing rate1
Flushing Rate
  • Surface Area
  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Ranges from 140 to 0.1, with a median of 1.1

slide16

outflow 50

inflow 50

Volume 100

inflow 100

outflow 100

Flushing Rate = 1

Volume 100

inflow 200

outflow 200

Volume 100

Annual Inflow / Volume = Flushing Rate

Flushing Rate = 0.5

Flushing Rate = 2

why is flushing rate important
Why is Flushing Rate important?

Flushing Rate is used to gauge inputs relative to lake volume.

A 100 acre lake with a low flushing rate has fewer inputs than a 100 acre lake with a high flushing rate.

slide18

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Same lake volume, different Inflow Volume

High Flushing Rate

Low Flushing Rate

slide19

Surface Area

  • Depth
  • Volume
  • Watershed Area
  • Flushing Rate

Same inflow volume, different Lake Volume

High Flushing Rate

Low Flushing Rate

slide21

Missouri’s Physiographic Regions

Glacial and Osage Plains

Ozark Border

Ozark Highlands

average phosphorus values for physiographic regions

Average Phosphorus Values (for physiographic regions)

Region Phosphorus (ug/L)

Glacial Plains 44 Osage Plains 73 Ozark Border 40 Ozark Highlands 17