eprintid: 457
rev_number: 12
eprint_status: archive
userid: 1
dir: disk0/00/00/04/57
datestamp: 2010-11-20 21:52:49
lastmod: 2017-01-13 20:24:31
status_changed: 2010-11-20 21:52:49
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Humpherys, A.S.
title: Evaluation of Drop-Check Structures for Farm Irrigation Systems
ispublished: pub
subjects: unclass
divisions: d_unclass
abstract: SMALL drop/check structures of various designs in
the 28 to 115 L/s (1 to 4 cfs) flow range were installed
in 1966 with their field performance evaluated in 1969.
They were again evaluated in 1984 after 19 years of
service. The parameters used to evaluate the structures
included cost, structural integrity, stability, hydraulic
performance and ditch erosion control capability. A
numerical rating was given in each category. A precast
concrete headwall with a rock-lined basin or plunge pool
was the most economical and one of the most effective
structures; however, special consideration must be given
to provide sufficient headwall length and cutoff wail
depth. Cast-in-place concrete structures were the most
stable and generally the most costly with variable
performances. Based on the study results and
observations, conclusions and recommendations were
made to improve the design of small drop structures.
date: 1986
date_type: published
id_number: 0575
full_text_status: public
publication: Transaction of the ASAE
volume: 29
number: 2
pagerange: 505-511,516
refereed: unknown
citation:   Humpherys, A.S.  (1986) Evaluation of Drop-Check Structures for Farm Irrigation Systems.   Transaction of the ASAE.      29(2):505-511,516.               
document_url: https://eprints.nwisrl.ars.usda.gov/id/eprint/457/1/575.pdf