Estimation of ground-water recharge from precipitation, runoff into drywells, and on-site waste-disposal systems in the Portland Basin, Oregon and Washington
Water-Resources Investigations Report
92-4010
By: D.T. Snyder, D. S. Morgan, and T.S. McGrath
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Abstract
The average recharge rate in the Portland Basin, in northwestern Oregon and southwestern Washington, is estimated to be about 22.0 inches per year. Of that amount, precipitation accounts for about 20.8 inches per year, runoff into drywells 0.9 inches per year, and on-site waste disposal about 0.4 inches per year. Recharge is highest, about 49 inches per year, in the Cascade Range. Recharge is lowest, near zero, along and between the Columbia and Willamette Rivers. Recharge is higher locally in discrete areas owing to recharge from runoff into drywells and on-site, waste-disposal systems in urbanized parts of the study area. In these urbanized areas, recharge ranges from 0 to 49 inches per year.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Estimation of ground-water recharge from precipitation, runoff into drywells, and on-site waste-disposal systems in the Portland Basin, Oregon and Washington |
| Series title | Water-Resources Investigations Report |
| Series number | 92-4010 |
| DOI | 10.3133/wri924010 |
| Edition | - |
| Year Published | 1994 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey ; Earth Science Information Center, Open-File Reports Section [distributor], |
| Contributing office(s) | Oregon Water Science Center |
| Description | v, 34 p. :ill., maps (some col.) ;28 cm. |
| Google Analytic Metrics | Metrics page |