2.5 Hydrologic Systems

The Department of Natural Resources’ Public Waters Inventory identifies three basins within the Schutz Lake subwatershed as under the jurisdiction of the DNR (see Figure 10). 

Table 2.  Public Waters in the Schutz Lake subwatershed.

DNR ID #

Name

10-18P

Schutz Lake

10-195W

Unnamed

10-196W

Unnamed

Source: Minnesota DNR. See Figure 10.

The 2003 MCWD Hydrologic, Hydraulic, and Pollutant Loading Study (HHPLS) included detailed modeling of the current and 2020 hydraulic and hydrologic conditions in the subwatershed.  That modeling includes the following results for 7 modeled nodes 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 minimal impacts on peak rate and volume, but that runoff rates and volumes from development should be monitored to prevent excessive flows in the small stream that drains the upper subwatershed.  

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

Event

Existing

2020

Snowmelt

1.5 year, 24 hour

28.3

-

-

100 year, 24 hour

42.3

43.2

-

100-year, 10-day

-

-

49.0

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