CE394k.3 - ArcGIS in Water Resources Term Project Update, Fall 2012

Transcription

1 CE394k.3 - ArcGIS in Water Resources Term Project Update, Fall 2012 Project Description: Prepared by Nick Brethorst October 29, 2012 ArcGIS Mapping of the Six Basins Watershed in, CA The Six Basins refers to the region of the cities of, La Verne, Pomona and Upland, and surrounding unincorporated areas of Los Angeles and San Bernardino counties within Southern California. This land mass overlies six interconnected groundwater basins. These basins include Canyon, Upper Heights, Lower Heights, Pomona, Live Oak, and Ganesha Basins. The Six Basins has member agencies that oversee the management of the groundwater within the basin and all have several monitoring and pumping wells. These member agencies include The City of Upland, The City of Pomona, The City of La Verne, Golden State Water Company, Pomona College, Pomona Valley Protection Agency, San Antonio Water Company, and Three Valleys Municipal Water District. Groundwater is beginning to play a much more important role in Southern California's water supply. No mapping of the Six Basins has been conducted using sophisticated programs like ArcGIS, and it would interesting to see how groundwater pumping affects the Six Basins. Project Objective The objective of this term project is to map the Six Basins using ArcGIS and try to determine how the groundwater basins are affected by groundwater pumping. Progress Made Data Collection and Compilation Locate and gather information on all of the pumping wells and static water level monitoring wells within the Six Basins. I spent the last two weeks mostly compiling all of the well information required to execute this project. I have successfully compiled all the important data required for the pumping wells and the static water level monitoring wells within the Six Basins for calendar year was the only year that provided a complete year's worth of data and will be used for the project. I have consulted Gonzalo Espinoza frequently to ensure that the data for the static pumping wells and static water level monitoring wells are in the proper format in Excel to upload into ArcGIS. Figure 1 provides a reference map that shows all of the general locations of the pumping wells and static monitoring wells. 1

2 Pumping Well Data Compilation Figure 1: Six Basins Map I compiled all of the pumping well data for all of the member agencies that pump within the Six Basins. Table 1 provides the member agencies and the number of active pumping wells they own and operate within the Six Basins. Table 1: Number of Active Wells within the Six Basins by Member Agency GSWC La Verne Pomona TVMWD Upland WECWC Number of Active Wells The data compiled on a monthly basis for the pumping wells included the following: Well Name State Well Number Latitude and Longitude (Decimal Degree) Year and Month Well Ground Surface Elevation (ft) Depth to Well while pumping (ft) Depth to Well when not pumping (ft) Well Depth (ft) Upper Perforated Screen Depth (ft) 2

3 Lower Perforated Screen Depth (ft) Volume pumped (AF/month) Table 2 provides a snap shot of the pertinent data for one of La Verne's pumping wells by month in The excel sheets were too extensive to provide in this project update. Please see the attached excel sheets for more information on all the other wells. Table 2: Sample of Pumping Well Data Compiled Well_Name State_Well_ Latitude Longitude DTWPUM DTWS Well_Dept Upper_Screen Lower_Screen YYYYMM GSE_ft Number _degn _degw P_ft TAT_ft h_ft _Depth_ft _Depth_ft Volume_AF Static Well Data Compilation I compiled all of the static groundwater elevation data for the eight monitoring wells within the Six Basins. The data compiled on a monthly basis included the following: Monitoring Well Name Radio Address Owner Latitude and Longitude (Decimal Degree) Well Ground Surface Elevation (ft) Year and Month Static Groundwater Elevation (ft) Well Address Well Depth (ft) Table 3 provides a snap shot of the pertinent data for one the eight monitoring wells by month in The Excel sheets were too extensive to provide in this project update. Please see the attached excel sheets for more information on all the other monitoring wells. 3

4 Table 3: Sample of Static Water Level Data Compiled Monitoring_Well Radio Address Owner Latitude _degn Longitude _degw GSE_ft YYYYMM Static_GW_Elev_ft Well_Address Well_ Depth_ft MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins MW #1 81 Six Basins Geology and Soil Characteristics Boring logs of monitoring wells MW-1, MW-2, and MW-3 were created using AutoCAD and will be used to make a soil profile in ArcGIS. The boring log profiles are included in Figure 2. Figure 2: Boring Profiles of Monitoring Wells MW-1, MW-2, MW-3 4

5 A soil map that encompasses the Six Basins was found from the USGS Website, shown in Figure 3. The data will be used in ArcGIS to determine soil properties, statistics, and the operating safe yield of the basin. Precipitation Data Figure 3: Soil Characteristics surrounding the Six Basins Precipitation Data was gathered from Three Valleys Municipal Water District at the only rain gage in the Six Basins, located right next to Monitoring Well MW-3. Table 4 provides the precipitation data in the Six Basins. Table 4: Precipitation Data in the Six Basins at MW-3 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

6 Digital Elevation Model A digital elevation model image has been uploaded in GIS. This model was created by merging two images together; one image that displayed the Los Angeles County side of the Six Basins, the second image that displayed the San Bernardino County side of the Six Basins. This will help delineate the Six Basins. The lowest point of the Six Basins is currently being determined to delineate the basin. Figure 4 provides the digital elevation model. Project Execution Steps Remaining Figure 4: Digital Elevation Model of the Six Basins The following steps still need to be taken to meet the Project Objective: Delineate the Six Basins and its six subwatersheds using ArcGIS and various sources. Upload the pumping well, monitoring well, boring data and precipitation data into ArcGIS Determine the operating safe yield (storage capacity) of the Six Basins. Determine the geology and soil characteristics within the Six Basins Determine the precipitation within in the Six Basins Create a cross sectional soil profile of the Six Basins Map and/or model the basin, if possible in ArcGIS, for the following scenarios and make comparisons: a) With pumping the aquifer. b) Without pumping the aquifer. 6