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The threshold can be a concrete elevation above the rocky bed of a mountain stream, or a vertical low weir structure, anchored in the embankment. The capacity of the inlet pipe / drain (diameter and gradient) should be 30% more than the design flow and have an uniform gradient to prevent accumulation of sand. The sedimentation tank can accumulate 1.5-2 m<sup>3</sup> of deposits and allows water to filter for 10 to 30 minutes at very low speed. It is cleaned by washing it out.
====Maintenance====
Regular inspection and cleaning of the grit / rack and possibly the gutter and sedimentation tank is required during and after storm periods.
*Matériaux (excluding the pipe and sedimentation tank): US$ 300 - 600.
*Main-d'oeuvre (si le site est facilement accéssible): 30 - 50 jours-homme.
===ManualsManuels, videos and linksvidéos et liens===*[http://www.samsamwater.com/library/TP40_11_Surface_water.pdf Surface water intake and small damsApport en eau de surface et petits barrages]. Chapter Chapitre 11. Revised by Révisé par Nhamo Masanganise.
===Remerciements===
*CARE Nederland, Étude documentaire : [[Resilient WASH systems in drought-prone areas|Système de résistance WASH dans des régions sujettes à la sécheresse.]] Octobre 2010.