1. Lakes of Missouri Volunteer Program
Lake Morphology and Hydrology
The
Lakes of Missouri Volunteer Program
University of Missouri-Columbia
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. Ranges from 6 to 53,814 acres in size, with a median of 103 acres.
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.

4. Surface Area of Classified Lakes
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
Depth (determined by dam height)

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

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
Lake Volume (determined by area and depth)

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. Same inflow volume, different Lake Volume
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
Watershed Area (catchment size)

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

13. Same size lake, but with different inflow volumes
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. Surface Area
Depth
Volume
Watershed Area
Flushing Rate
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. Ranges from 140 to 0.1, with a median of 1.1
Surface Area
Depth
Volume
Watershed Area
Flushing Rate
Flushing Rate
Ranges from 140 to 0.1, with a median of 1.1

16. Flushing Rate = 0.5 Flushing Rate = 1 Flushing Rate = 2
Annual Inflow / Volume = Flushing Rate
inflow 50
outflow 50
Volume 100
Flushing Rate = 0.5
Volume 100
outflow 100
inflow 100
Flushing Rate = 1
outflow 200
inflow 200
Volume 100
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. Same lake volume, different Inflow Volume
Surface Area
Depth
Volume
Watershed Area
Flushing Rate
Same lake volume, different Inflow Volume
High Flushing Rate
Low Flushing Rate

19. Same inflow volume, different Lake Volume
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. Missouri’s Physiographic Regions
Glacial and Osage Plains
Ozark Border
Ozark Highlands

22. Average Phosphorus Values (for physiographic regions)
Region Phosphorus (ug/L)
Glacial Plains Osage Plains Ozark Border Ozark Highlands 17