2.5 Hydrologic Systems

The Department of Natural Resources’ Public Waters Inventory identifies numerous basins within the Gleason Lake subwatershed as under the jurisdiction of the DNR (see Figure 10).  These include Gleason and Hadley Lakes and the following other basins:

Table 2.  Public Waters in the Gleason Lake subwatershed.

Name and DNR ID #

Name and DNR ID #

Name and DNR ID #

Gleason (27-95 P)

Unnamed (27-610 W)

Unnamed (27-823 W)

Hadley (27-109 P)

Unnamed (27-611 W)

Unnamed (27-824 W)

Kreatz (27-467 W)

Unnamed (27-612 W)

Unnamed (27-825 W)

Snyder (27-108 P)

Unnamed (27-613 W)

Unnamed (27-826 W)

Unnamed (27-105 W)

Unnamed (27-686 W)

Unnamed (27-827 W)

Unnamed (27-468 W)

Unnamed (27-687 W)

Unnamed (27-828 W)

Unnamed (27-607 W)

Unnamed (27-688 W)

Unnamed (27-844 P)

Unnamed (27-609 W)

Unnamed (27-822 W)

 

Source:  Minnesota DNR.  See Figure 10.

The HHPLS included detailed modeling of the current and 2020 hydraulic and hydrologic conditions in the subwatershed.  That modeling includes the following results for modeled locations (lakes, ponds, channels, and crossings) within the subwatershed:

  • Existing Normal Water Level;
  • Existing High Water Level, peak discharge, and peak velocity for the 1.5 year, 24-hour and 100-year, 24-hour events;
  • 2020 predicted HWL, peak discharge, and peak velocity for the 100-year, 24-hour event; and the
  • Existing High Water Level for the 100-year, 10-day snowmelt event

Those detailed results are not reproduced here, but are incorporated by reference.  The HHPLS model predicted that development in the upper subwatershed expected by 2020 would likely have impacts on local peak flows and volumes (see Figure 2) and volume controls should be considered for all new development.

Table 3.  Modeled peak discharge from the Gleason Lake subwatershed (cfs).

Event

Existing

2020

Snowmelt

1.5 year, 24 hour

53.7

-

-

100 year, 24 hour

91.2

92.1

-

100-year, 10-day

-

-

90.1

Source:  2003 MCWD Hydrologic, Hydraulic, and Pollutant Loading Study (HHPLS)