Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (266 KB bytes)

Title: Effects of timber harvesting on the lag time of Caspar Creek watershed

Author: Sendek, Karen Hardison;

Date: 1985

Source: M.S. Thesis, Humboldt State University, Arcata, California. 46 p.

Publication Series: Miscellaneous Publication

Description: Abstract - Hydrograph lag time was analyzed to determine changes after road construction and after selective, tractor-yarded logging in a Caspar Creek watershed, Mendocino County, California. The paired watershed technique was used. Hydrograph lag time for each storm was the time separation between the midpoint of precipitation and the time coordinate of the runoff centroid. No significant change in lag time was detected after road construction. After logging, the lag time generally increased for small, early fall storms and decreased for larger storms. To determine whether the change after logging was influenced primarily by the rising or falling limb of the hydrograph, each hydrograph record was split at the peak and the lag time was measured to the centroid time coordinate of each segment. A statistically significant reduction in both the rising and falling limb lag times was observed. Six hydrologic variables were examined as predictors of the effect of logging on lag time. Proportion of area logged and the ratio of proportion of area logged divided by the storm sequence number were the best predictors. Other variables examined were North Fork peak flow, storm sequence number, storm size, and antecedent precipitation

Keywords: PSW4351, Caspar Creek, watershed, timber harvesting, hydrograph lag time, falling limb lag tim

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.



Sendek, Karen Hardison 1985. Effects of timber harvesting on the lag time of Caspar Creek watershed. M.S. Thesis, Humboldt State University, Arcata, California. 46 p.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.