Manage me nt of E r osion in the Gisbor ne Distr ic t 9 Ma y 2014
Gisbor ne Distr ic t • We ll kno wn fo r its so il e ro sio n • T he distric t o c c upie s 8 % o f the No rth I sla nd • Appro xima te ly 25 % o f the No rth I sla nd’ s se ve re to e xtre me e ro sio n is pre se nt
What Cause s Our E r osion Pr oble ms? • So ft Ro c k Ge o lo g y • Clima te • Ve g e ta tio n Cle a ra nc e • Co mb ina tio n o f the se fa c to rs
Ge ology •Motu Block •East Coast Allochthon •Volcanics •Neogene Cover •Tephra •Quaternary
Whakoau Str e am
Climate • Hig h ra infa ll in pa rts o f the distric t • Winte r a nd a utumn c o nc e ntra tio ns – E a rthflo ws a fte r pro lo ng e d we t we a the r c o nditio ns • T ro pic a l Cyc lo ne s a nd I nte nsive E ve nts – So il Slipping – De e p-se a te d Slumping
What is Be ing Done ? • T he Distric t Pla n ha s a rule re q uiring la ndo wne rs to e sta b lish “e ffe c tive ” o n “the wo r tr e e c o ve r st e r o ding land” • L a nd Ove rla y 3A ha s b e e n ide ntifie d in the pla nning ma ps • F unding is a va ila b le thro ug h the E a st Co a st F o re stry Pro je c t
T ype s of Soil E r osion • Gullie s • Slumps • E a rthflo ws • Stre a mb a nk • Slips
Gullying
Slips
Slump: Ae r ial Vie w
Slumping
Slumping
E ar thflow
E ar thflows
Str e am bank E r osion
What Can Be Done ? • T re e pla nting : – Affo re sta tio n • E xo tic se e dling s • I ndig e no us spe c ie s – Re ve rsio n – Po pla r a nd Willo w Pla nting – Co mb ina tio n o f T re a tme nts – Struc tura l suppo rt
F or e str y & Re ve r sion
F or e str y, F ar ming & Re ve r sion
Gully Planting and Re ve r sion
Re ve r sion, planting of indige nous spe c ie s
Re ve r sion & Untr e atable
Combination of Ve ge tation T ype s
Be e s • Spe c ie s a sso c ia te d with e ro sio n c o ntro l: – Willo w – Ma nuka – Othe r indig e no us spe c ie s
Can Counc il Assist? • Co nfirm a re a s o f L O3A whic h re q uire pla nting • Assist with funding a pplic a tio ns
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