JFSD202021CR Lagoon Vegetation Analysis Study.pdf

Lagoon Vegetation Analysis 1st Lt Ben Thompson

31 July 2019

Current Condition (26 Apr 19)

Primary

North Secondary

South Secondary

Tertiary

Dead Vegetation

Current Condition (26 Apr 19) cont.

Problem

• Root system can penetrate clay liner of lagoon, causing excessive leakage of contents into environment

• Plants block sunlight from entering water

• Photosynthetic algae won’t produce as much dissolved oxygen

• Bacteria can’t break down pond material

• Plants cause calming of water

• Inadequate mixing of pond contents

• Essential microrganisms don’t grow or work as well

• Plants provide habitat for insects and wildlife

Past Effort

• Entomology shop sprayed herbicide – Summer 2018

• Rodeo Aquatic Herbicide – Glyphosate-isopropylammonium 53.8% (Group 9

Herbicide)

• Attacks entire plant

Ways to Limit Cattail Growth

• Cutting/Pulling

• Pulling works best when done before cattails have become established

• Should be cut back below water surface

• Can be accomplished by draining and refilling ponds, but that isn’t really plausible with current flow rates

• Can be accomplished in-house or by contract

• Spraying

• Use approved aquatic herbicide

• May kill whole plant or just part above surface

• Can be accomplished in-house or by contract

• Increase water level

• Should be maintained above 3 feet

• No way to add wastewater without adding personnel

• Best long-term solution

Lagoon Capacity

• Primary: 76.9 Acres, 6 ft deep ≈ 87,000 Gal

• North Secondary: 26.2 Acres, 7 ft deep ≈ 34,500 Gal

• South Secondary: 34.7 Acres, 6 ft deep ≈ 39,000 Gal

• Tertiary: 36.7 Acres, 6 ft deep ≈ 41,500 Gal

• Total: 174.5 Acres, 202,000 Gal

Wastewater Flow Over Time

10000

15000

20000

25000

30000

35000

M ar-06

Jul-06

O ct-06

Jan-07

Apr-07

Aug-07

N ov-07

Feb-08

Jun-08

Sep-08

Dec-08

M ar-09

Jul-09

O ct-09

Jan-10

M ay-10

Aug-10

N ov-10

Feb-11

Jun-11

Sep-11

Dec-11

Apr-12

Jul-12

O ct-12

Jan-13

M ay-13

Aug-13

N ov-13

M ar-14

Jun-14

Sep-14

Dec-14

Apr-15

Jul-15

O ct-15

Jan-16

M ay-16

Aug-16

N ov-16

M ar-17

Jun-17

Sep-17

Dec-17

Apr-18

Jul-18

O ct-18

Feb-19

M ay-19

Aug-19

Dec-19

M ar-20

Fl ow

(1

Ga l)

Lift Station Flow Totals

Average Monthly Total 07-10: 12.45M Gal Average Monthly Total 11-19: 8.60M Gal Average Annual Total 11-19: 103.2M Gal

Departure of Last KC-135

Evaporation Loss

• Not measured on site

• Annual Average using data from nearby locations:

• Lake Ashtabula: 138.0M Gal

• Devil’s Lake: 169.2M Gal

• Fargo: 194.1M Gal

• Annual Average Influent:

103.2M Gal

• Need to add 35M – 91M Gal annually

Average Monthly Influent

Lake Ashtabula 1931-2001

(USGS)

Devil's Lake 1951-1970

(NOAA TR34)

Fargo 1963-1979 (NOAA

TR34),

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

M ill io n

Ga llo ns

All Cells

Closing Cells

• South Secondary

• Total surface area drops to 6.09M

Sq Ft

• Average annual evap loss still above average influent

• Tertiary

• Total surface area drops to 6.00M

Sq Ft

• Average annual evap loss still above average influent

Average Monthly Influent Lake Ashtabula

1931-2001

(USGS)

Devil's Lake 1951-

1970 (NOAA

TR34)

Fargo 1963-1979

(NOAA TR34)

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

M ill io n

Ga llo ns

Close South Secondary

Average Monthly Influent

Lake Ashtabula 1931-2001

(USGS)

Devil's Lake 1951-

1970 (NOAA

TR34)

Fargo 1963-1979

(NOAA TR34)

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

M ill io n

Ga llo ns

Close Tertiary

Possible Sources of Additional Flow

South Drainage Line

• Basin Area: 2.49 Sq Mi

• 2 Year Peak Flood Flow: 51.7 ft3/s

• 1” of rain in a 24 hr period will equal 33,415,000 gal.

• Average Annual Rainfall: 20.73 in

• Would have to pump from drainage ditch to ponds

North Drainage Line

• Basin Area: 1.83 Sq Mi

• 2 Year Peak Flood Flow: 44.4 ft3/s

• 1” of rain in a 24 hr period will equal 28,696,000 gal.

• Average Annual Rainfall: 20.73 in

• Would have to pump from drainage ditch to ponds

• Across private land

Housing Drainage

• Basin Area: 0.65 Sq Mi

• 2 Year Peak Flood Flow: 19.2 ft3/s

• 1” of rain in a 24 hr period will equal 12,409,000 gal.

• Average Annual Rainfall: 20.73 in

• Would have to pump against natural flow and at least a mile to get to ponds

• UP contractor not currently on board with pumping from residential sump pumps into housing lift station

• Amount of flow from housing sump pumps would be less than total for drainage area.

Conclusion

• Short Term: Need to cut or spray existing vegetation using in-house or contract labor.

• Long Term: Find a way to increase and maintain water levels.

• Closing cells provides minimal benefit and may be difficult to reopen if we ever need to increase capacity in the future.

• Stormwater can be added from the south end of base and potentially from sump pumps in housing

• Recommendation: Spray existing vegetation with in-house labor, initiate project to pump stormwater from south drainage ditch