Waters Protection Ordinance
(WPO)

¹ In or­der that the bed load budget in a wa­ter­course is not un­fa­vour­ably in­flu­enced by ex­trac­tion of gravel, sand or oth­er ma­ter­i­als (Art. 44 para. 2 let. c WPA), the au­thor­it­ies must en­sure that:

a.

the quant­ity of bed load ex­trac­ted from the wa­ter­course does not ex­ceed the nat­ur­al sup­ply;

b.

the ex­trac­tion does not in the long term lead to a sub­sid­ence of the bot­tom out­side the ex­trac­tion peri­met­er;

c.

the ex­trac­tion does not render im­possible the main­ten­ance and re-es­tab­lish­ment of in­vent­or­ied flood­plains;

d.

the ex­trac­tion does not lead to a sub­stan­tial change in the particle size dis­tri­bu­tion of the bot­tom ma­ter­i­al out­side the ex­trac­tion peri­met­er.

² Ex­trac­tion ac­cord­ing to para­graph 1 should not lead to tur­bid­ity that may im­pair fish­ing wa­ters.