Description
Groundwater recharge with recycled wastewater is viewed as a necessity inwater-short areas. In California, the coastal overdraft situation is alreadyalarming and threatens to become worse. The purpose of groundwater recharge withrecycled wastewater is to stop declining levels of groundwater, protect thecoastal aquifers against saline intrusions, provide inexpensive storage andtransmission of the recharged water, ameliorate problems of land subsidence, andprovide additional treatment of the recycled water. This paper presents the casestudy of West Coast Basin, which provides about 20% of the potable water supplyin the West Basin Municipal Water District (WBMWD) service area. In order to haltfurther seawater intrusion, the West Coast Basin Barrier Project (WCBBP) wasinitiated by the Los Angeles County Department of Public Works (LADPW) andinvolves the injection of potable water in order to maintain groundwater levelshigh enough to prevent further seawater intrusion. In mid- 1995, WBMWD beganproducing recycled wastewater, which is currently blended with potable waterprior to injection. The main goal of a new R&D program, started in 1998, is toprovide a technical and scientific basis to better understand the transport ofrecycled wastewater within the West Coast Basin. An important regulatory issuefor approving the operation of indirect potable reuse projects, is the tracingand modeling of the behavior of recycled wastewater in the aquifers. Simulationsusing a groundwater flow, solute transport and salt water intrusion models in theWest Coast Basin were carried out in 1993 to address regulatory requirementsrelating to injection of recycled wastewater into the WCBBP. Earlier modelsimulations evaluated the effectiveness of the barrier in preserving the aquifersfrom saline intrusion and in controlling the advancement of inland saline plumes.This paper presents the first results of the application of a new hydrodynamicand hydrodispersive geographic information system (GIS) model, taking intoaccount the differences in density of salt water and the use of boron isotopesfor recycled wastewater tracing purposes. Includes 6 references, tables, figures.
Product Details
- Edition:
- Vol. – No.
- Published:
- 01/01/2000
- Number of Pages:
- 15
- File Size:
- 1 file , 1.7 MB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
