5.2. SR 08-08-2011 - Laserfiche WebLink

Home Browse Search

numbers and DNR appropriation permit numbers, if known. Identify any existing and new wells on the site map. If there are no wells known on site, explain methodology used to determine. Available geology, surrounding private and public wells, and the existing water system has been evaluated. With regard to the existing water system, the existing water supply and storage system for the entire City was evaluated with respect to the City's overall water system average and peak day demands. The City's existing distribution system was evaluated for only the low pressure zone. Elfering and Associates, the Elk River Municipal Utilities engineering consultant, provided the City with the existing low pressure zone water system model and not the entire system. To determine the existing available aquifer and surrounding well information, existing bed rock maps and the County Well Index maintained by the Minnesota Department of Health was utilized. The Department of Natural Resources provided historical water use data, including annual water pumped and peak day demands. The information provided by the DNR also included the number of water connections within the City; however, water demands specific to the low pressure zone was not available. To provide recommendations for the water service within the AUAR study area, water demands for the three development scenarios were calculated and evaluated using the City's low pressure zone water model. For each development scenario, the water demand was calculated based on per unit for residential land uses and per square footage for non-residential land uses. The water demand assumptions used are based on our experience with other projects and are typical of cities of similar size for planning purposes. The following table presents the water use assumptions that were used during the development of this memo. Table 13-1. Residential and Non-Residential Water Demand Assumptions Average Daily Units/Water Water Demand Peak Hour Land Use Per Calculated Peak Day Factor* Connection Factor** Water Connection (gpd) Residential 1 Residential Connection 274 2.6 1.5 Commercial 3,000 Sq ft of Building 274 2.6 1.5 Industrial 5,620 Sq ft of Building 274 2.6 1.5 *the City's Peak Day factor is based on the historical 5-year average day to peak day factor information provided by the DNR. **the Peak Hour Factor is based on our experience with other projects in City's of a similar size City of Elk River Draft Alternative Urban Areawide Review July 2011 Page 32 of 84