International Rainwater Catchment Systems Association
International Rainwater Catchment Systems Conferences
  Next conference
  1st, Hawaii
  2nd, St Thomas
  3rd, Khon Kaen
  4th, Manila
  5th, Taiwan
  6th, Nairobi
  7th, Beijing
  8th, Tehran
  9th, Petrolina
  10th, Mannheim
  11th, Texcoco
  12th, New Delhi
  13th, Sydney
  14th, Kuala Lumpur
  Join IRCSA
  IRCSA Board

5th International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991

Section 9: Alternative Uses of Cistern Water

Page 521

A Simple Weir for Economical Floodwater Diversion

Ahang Kowsar, Akbar Zargar
Research Institute of Forests and Rangelands, Iran.


Diversion dams or weirs sometimes constitute the most expensive and troublesome structures in the design and construction of floodwater spreading (FWS) systems. Many plan for construction of potentially viable FWS systems have bee cancelled in the feasibility stage studies because, on occasions, the expenses involved in the design and construction o a single weir or diversion dam far outweigh the cost of the rest of the project. Thus, justification of the entire project hinges on designing a workable structure at a low cost. Gabion provides a useful material for construction of simple, inexpensive weirs which could be fitted into many designs, and may be. built by unskilled laborers.

Fifteen pieces of 3 0 x 4 0 m, 3 mm diameter galvanized wire netting were used. to construct a.0.60 m high on a 28.0 m wide ephemeral river on a debris cone to diver up to 5m3 s-l of floodwater to a 25 ha FWS system in the Gareh Bygone Plain in, southern Iran. The costs were at least 136 times lower than building a hydraulically efficient, concrete structure having the same capacity.

Although the intake structure behind the weir located on the inside of the river bend, and at a 9° angle to it, no detectable deposition of sediments has--taken-place at this point during 6 years of operation. These hydraulic anomalies deserve further attention.

PDF of full document (8pp,210kb)

Note: The IRCSA proceedings section is still new and under active management, If you find any problems, ommissions or corrections please contact the administrator so we can put things right.
Top of Page