Lakes%20of%20Missouri%20%20Volunteer%20Program

1
Lakes of Missouri Volunteer Program
Lake Morphology and Hydrology
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
2

• Lake Morphology/Hydrology
• Surface Area
• Depth
• Volume
• Watershed Area
• Flushing Rate

3
Surface Area

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

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

4

• 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.
5
Depth(determined by dam height)

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

6
Average Depth

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

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

7
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.

8
Lake Volume(determined by area and depth)

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

9
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
10

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

Same inflow volume, different Lake Volume
Dam height and topography determine the lake
volume
11
Watershed Area(catchment size)

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

12
Watershed Area

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

13

• 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
14
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
15
Flushing Rate

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

Ranges from 140 to 0.1, with a median of 1.1
16
Annual Inflow / Volume Flushing Rate
Flushing Rate 0.5
Flushing Rate 2
17
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.

18

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

Same lake volume, different Inflow Volume
High Flushing Rate
Low Flushing Rate
19

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

Same inflow volume, different Lake Volume
High Flushing Rate
Low Flushing Rate
20
Quick Ecoregion Overview
21
Missouris Physiographic Regions
Glacial and Osage Plains
Ozark Border
Ozark Highlands
22
Average Phosphorus Values (for physiographic
regions)

• Region Phosphorus (ug/L)
• Glacial Plains 44 Osage Plains
  73 Ozark Border 40
  Ozark Highlands 17

23
(No Transcript)
24
(No Transcript)