Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 368 - PROCEDURES FOR DETERMINING PRIORITIES FOR ASSISTANCE AWARDS UNDER THE ILLINOIS CLEAR LAKES PROGRAM
Subpart B - PROCEDURES FOR CALCULATING PRIORITY POINTS FOR INLAND LAKE STUDY AND IMPLEMENTATION PROJECT AWARDS
Section 368.230 - A2 Factor (Water Quality Potential)
Universal Citation: 35 IL Admin Code ยง 368.230
Current through Register Vol. 48, No. 38, September 20, 2024
a) A2 is a factor that evaluates inland lakes based on their Water Quality Potential (WQP). The potential quality of a lake is determined by the quality of the incoming water, water residence time, and lake basin characteristics. Four factors are used to rank inland lakes for water quality potential:
1) ratio of watershed
area to lake surface area (WA:SA);
2) mean lake depth;
3) lake water retention time; and
4) lake size.
b) Priority points for the A2 factor are allocated as follows (0-100 points possible):
1) Watershed Area/Lake Surface Area Ratio
A) Less than or equal to 20
B) Greater than 20 but less than or equal to
50
C) Greater than 50 but less than
or equal to 100
D) Greater than
100
2) Mean Depth (feet)
A) Greater than 15
B) Greater than 10 but less than or equal to
15
C) Greater than 5 but less than
or equal to 10
D) Less than or
equal to 5
3) Water
Retention Time (years)
A) Greater than
1.00
B) Greater than 0.50 but less
than or equal to 1.00
C) Greater
than 0.25 but less than or equal to 0.50
D) Less than or equal to 0.25
4) Lake Size (acres)
A) Greater than 100 but less than or equal to
500
B) Greater than six but less
than or equal to 100; or greater than 500 but less than or equal to
1000
C) Less than or equal to 6 or
greater than 1000
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