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Time of travel (TOT) polygons show the maximum time required for groundwater at a point in the polygon area to travel through the water bearing aquifer soils to a municipal supply well. Redmond TOT areas were derived from the 2018 MODFLOW groundwater model with the assumption of all municipal supply wells pumping at their full water rights. These TOT areas do not reflect any active temporary construction dewatering (TCD), which artificially lowers water levels and changes groundwater flow directions. TCD can change the TOT area for supply wells and the Critical Aquifer Recharge Area (CARA) includes TCD buffers which account for potential TCD scenarios. Because of this, the TOT areas should be used in conjunction with the CARAs. The groundwater model is reviewed for needed updates every five years. |