2.5 Hydrologic Systems

The Department of Natural Resources? Public Waters Inventory identifies five basins within the Dutch Lake subwatershed as under the jurisdiction of the DNR (see Figure 10).  These include Dutch Lake and four unnamed wetlands.

Table 2.  Public Waters in the Dutch Lake subwatershed.

DNR ID #

Name

27-181P

Dutch Lake

27-940W

Unnamed

27-942W

Unnamed

27-938W

Unnamed

27-939W

Unnamed

 

Dutch Creek

 

Unnamed watercourse Sec 3 T117 R24 to Dutch Lake

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 minimal impacts on peak rate and volume, but that rate and volume controls should be considered for the ultimate development condition.  Rate and volume controls should be considered for the two subwatershed units downstream of Dutch Lake that drain to Dutch Creek (DL-6 and DL-7) to minimize erosion and sediment transport potential.

Table 3.  Modeled peak discharge in the Dutch Lake subwatershed (cfs).

Event

Existing

2020

Snowmelt

1.5 year, 24 hour

44.1

-

-

100 year, 24 hour

97.2

100.1

-

100-year, 10-day

-

-

81.1

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