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2.2 TOPOGRAPHY <br />The Anoka Sandplain is the primary influence on the topography in the City of Mounds View, which leads <br />to the gently rolling terrain seen today. As large glacial blocks from the Grantsburg Sublobe (of the larger <br />Des Moines glacial lobe) melted, glacial streams deposited sand in broad, level plains. Shallow lakes <br />formed as these glacial streams became dammed. The particular glacial lake that covered Mounds View is <br />known as glacial Lake Fridley. <br />The City has moderate topographic relief. The City is generally flat with slopes that range from zero to six <br />percent. Several natural depression storage areas exist throughout the City. In the post -glacial period, no <br />significant streams have drained Mounds View, though the City does discharge to the south into Rice <br />Creek. <br />2.3 SOILS <br />The Natural Resources Conservation Service (NRCS) developed a Soil Survey of Ramsey and Washington <br />Counties, which includes the City of Mounds View. One aspect of this survey characterizes most soil types <br />into Hydrologic Soil Groups (HSG). The HSG reflects a given soil's ability to infiltrate stormwater during <br />long duration storms. The four hydrologic soil groups are: HSG A — high infiltration, HSG B — moderate <br />infiltration, HSG C — slow infiltration, and HSG D — very slow infiltration. <br />The soils in the City reflect the development of the Anoka Sandplain. According to the County Soil Survey, <br />Mounds View includes a mix of urban and wetland soil classifications. While the County Soil Survey <br />identifies much of City as "urban land," the soil survey categorizes a large majority of these "urban land" <br />soils in the Zimmerman-Isanti-Lino Soils Association. Soils in this Association are typically found in level to <br />gently rolling terrain of the Anoka Sandplain and can range from poorly drained to excessively drained, <br />classified as HSG A and B soils. Figure 2.2 presents the soils classifications by HSG for the City of Mounds <br />View. <br />City of Mounds View 4 <br />Local Surface Water Management Plan Stantec Project No. 193804166 <br />Sta nte+c <br />