Missouri Nutrient Criteria Development

Mark Osborn

Lakes & Reservoirs

• Natural Lakes (very few)

– Sinkhole ponds (in karst areas)

– Ox-bow lakes, blew holes, wetland lakes

– 1 tectonic

• Artificial Lakes and Reservoirs

– ~2900 > 5 ac in area

– 22 > 1000 ac in area

• 456 listed as Waters of the State

History of Reservoir Construction in Missouri

(reservoirs > 10 acres in surface area)• Year Completed No. of reservoirs Percentage

1800 – 1920 122 81920 – 1940 267 181940 – 1960 68 51960 – 1980 909 611980 – 1995 121 8

Lake Regions in Missouri

Big RiversOzarksPlains

Lake Regions

N

EW

S

0 60 120 Miles

(12)

(53)

(82)

Range of Total Phosphorus samples in lake regions

29

87

117

2

3145

163

19

698

192

1343

75

276

33

1

10

100

1000

10000

Plains Big Rivers Ozarks

To

tal P

ho

sp

ho

rus

(u

g/L

)

n = 3120 n = 290 n = 1968

Log distribution of Total Phosphorus in Lake Regions

0

100

200

300

400

500

600

700

800

900

Fre

qu

en

cy

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2log [TP (ug/L)]

Ozarks

Plains

Big Rivers

Log distribution for Total Nitrogen in Lake Regions

0

100

200

300

400

500

600

700

Fre

qu

en

cy

1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9log [TN (ug/L)]

Ozarks

Plains

Big Rivers

Log distribution for chlorophyll-a in lake regions

0

100

200

300

400

500

600

700

Fre

qu

en

cy

-0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3log [chl-a (ug/L)]

Ozark

Plains

Big Rivers

Log distribution for Secchi depth in lake regions

0

100

200

300

400

500

600

700

Fre

qu

en

cy

-1.1 -1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1log [Secchi depth (m)]

Ozarks

Plains

Big Rivers

Median chlorophyll-a response to median total phosphorus

Big Riversy = 0.8765x - 0.2245

R2 = 0.646

Plainsy = 0.9433x - 0.362

R2 = 0.6646

Ozarksy = 1.3517x - 0.9536

R2 = 0.8532

0

0.5

1

1.5

2

2.5

0 0.5 1 1.5 2 2.5 3

log TP (ug/L)

log

Ch

loro

ph

yll-a

(u

g/L

)

Big Rivers Plains Ozarks Linear (Big Rivers) Linear (Plains) Linear (Ozarks)

Potential TP criteria based on chlorophyll-a response(ug/L)

Chl-a (25th percentile)

TP Chl-a (median)

TP

Plains 8.2 22.5 15.4 43.9

Big Rivers 24.8 70.3 42.7 130.7

Ozarks

2.8 10.9 6.3 19.8

Other factors to consider

• Designated Uses

• Area, Depth, and Volume

• Watershed size and characteristics

• Residence time

Residence Time

Volume 100

outflow 100

outflow 200

inflow 100

inflow 50

inflow 200

outflow 50

Volume 100

Volume 100

RT = 2 years

RT = 1 years

RT = .5 years

Lake Nutrient Criteria = f [lake region, designated uses,watershed, lake dimensions,residence time]

Streams

Rule making procedures

Program Determines need for Rulemaking; Submits

"Request for Approval to Begin Rulemaking"

with Rulemaking Report to

Division

Program develops Regulatory Impact Report (RIR) and draft Rulemaking through research and outside input.

Program requests interagency review and RIR public notice

Division then OD Reviews;

OK to Release?

AGO reviews draft PRM for content and signs

takings analysis memo to DNR Director

Division Director Reviews;

required to alert DNR Director;

Approves?

> Program places 60 day RIR notice in newspaper

and on web page. > OD e-mails draft RM to interagency coord. team

not later than 35 days prior to filing date.

Program responds to comments on the web.

Board or commission makes Finding of Necessity

Program assembles the PRM package to meet 536 RSMo

and other requirements

Division Counsel reviews for

legal authority and concerns.

Forwards?

PRM Folder to Division Director for review and approval.

Approves?

PRM to General Counsel and

DNR Director for Approval & Signature(Need >= 20 day lead before ORM file date)

Approves and Signs?

Program Delivers Signed PRM w/RIR to SoS, and JCAR. OA gets PRM. If required, SBRFB gets

PRM and SBIS

Assuming no problems with JCAR, PRM is published in MoReg and PRM public

participation begins. - Go to Flowchart App J3 -

Program revises PRM as

necessary or

withdraws.

YES

NO

YES

YES

NO

NO

Rulemaking w/ RIR Up To PRM Filing

YES

NO

YES

NO

Public Hearing held (if required) no sooner

than 30 days after PRM published.

Public Comment Period Ends. Program has 90

days to file the ORM with the SoS

Program develops responses in

consultation with stakeholders as

necessary and makes revisions as required.

Were there Comments requiring a

response?

Commission or Board votes on

disposition of ORM.Adopts?

Program files a Final Order for Withdrawal of the proposal with the

SoS

Program assembles the ORM package to meet 536 RSMo and other

requirements and submits to Division

Division Reviews ORM package

All there?

Division submits ORM to DNR Director and General Counsel for

Signature. ORM package returned to program.

Program Delivers Signed ORM to JCAR 30 or more days prior to

filing with the SoS and OA.

ORM published in MoReg, then completed rule published 15-30 days later in CSR. Effective 30 days after CSR publication

Program revises package as necessary

YES

NO

YES

NO

Rulemaking After Public Participation

(for programs with a rulemakingboard or commission)

NO

YES

Questions?