Attachments 11.4 and 11.5 - City of Busselton

More documents

Recommendations

Info

ATTACHMENT B - RIVERBANK REINSTATEMENT DESIGN ITEM 11.4 COUNCIL 12/10/2011 N PEEL TERRACE GRASS COARSE SAND PLANTING SEE DETAIL A PLANTING VASSE PEDESTRIAN BRIDGE TO BE UPGRADED 2007 RIVER CAUSEWAY ROAD 10 5 0 10 20 30 m SCALE 1: 500 PLAN VIEW 1 0m AHD -1 EXISTING EMBANKMENT SAWDUST/ LIMESTONE ( EQUAL PORTIONS) PAPERBARKS SEDGES SAND INFILL LIMESTONE RUBBLE SLOPE 1:3 LIMESTONE RUBBLE HWM 0.8 AWM 0.3 LWM -0.3 GL GRASS TO AVERAGE WATER MARK HWM 0.8 AWM 0.3 LIMESTONE WEED BARRIER/ PATH LIMESTONE WEED BARRIER/ PATH COARSE SAND BEACH BELOW AVERAGE WATER LINE LIMESTONE RUBBLE PLANTING / FABRIC (A.W.M) (L.W.M) PLANTING / FABRIC -2 0m 3 6 9 12 DIST PROPOSED NORTH BANK CROSS SECTION DETAIL A ISSUE DATE GRID REVISION DRN REC APPD SURVEY BOOKS DATUM DES REF DES CHD DRN CBC 04/07 NORTH POINT RECOMMENDED REC APPROVED APP SHIRE OF BUSSELTON PH: 97810444 SHIRE OF BUSSELTON PROPOSED EMBANKMENT REPAIR & UPGRADE VASSE RIVER - NORTH EMBANKMENT SHEET 1 OF 1 FILE PROJECT PLAN ENV1 VRIVER 03-01 CAD ISSUE A ORIGINAL SHEET SIZE MF F:\TECH SERVICES\ PLAN INDEX\ DRAINAGE\ VRIVER 03-01
ATTACHMENT C - TREATMENT OPTIONS CONSIDERED IN THE COUNCILLOR WORKSHOP OF MAY 2011 ITEM 11.4 COUNCIL 12/10/2011 1 TREATMENT OPTIONS CONSIDERED IN THE COUNCILLOR WORKSHOP OF MAY 2011. This section provides brief discussion on the treatment options that were discussed during the workshop and why they were or were not considered for further investigation. Phoslock Phoslock is a modified clay, designed to reduce the release of phosphorus from sediments in waterways. It acts to permanently bind filterable reactive phosphorus (FRP), which is the type of phosphorous available to algae. By limiting the amount of phosphorus it is possible to prevent algal blooms from occurring or, at least, prevent them from progressing to the more harmful blue-green algal bloom condition. Phoslock is applied to the water by mixing into a slurry and spraying over the whole surface so that it covers all the sediments of the water body. As the Phoslock settles it removes Phosphorous from the water column. It then settles on the riverbed and acts as a reactive layer, intercepting any FRP that may be released by the sediment. The main benefit of Phoslock application is the permanent removal of phosphorus that had accumulated in sediments. By so doing algal growth is limited for some time, in the order of weeks to months. However, it is less effective in reaction to a bloom event since much of the Phosphorus is bound up in algae and not available to the clay Phoslock treatment is relatively effective during summer unless summer rain occurs which delivers more P to the LVR from septage and surface runoff. It would be possible to undertake topical dosing of Phoslock after rain given the improvements in Phoslock packaging and delivery systems.. Applications of Phoslock are relatively expensive: up to $200,000 per application depending on area treated and number of treatments. Because there are inflows of nutrient to the river from surface run-off and groundwater, stopping the nutrient from the sediments will not prevent algal blooms from occurring and therefore the application of Phoslock would need to be ongoing. Operationally on full dosing of between 40 and 60 tonnes would be applied in the first year with smaller dosings of 10 to 20 tonnes in subsequent years. Until control of Phosphorus sources such as septage, agricultural runoff and industrial and residential runoff all treatments of the LVR to manage algal blooms will be ongoing including Phoslock however in the case of Phoslock the costs are minimised by the treatment sequence described above. On that basis Phoslock was a lower priority option for treatment. Algal flocking materials
Page 1 and 2: ATTACHMENT A - MACROPHYTE PROPOSAL
Page 3 and 4: ATTACHMENT A - MACROPHYTE PROPOSAL
Page 5: ATTACHMENT A - MACROPHYTE PROPOSAL
Page 9 and 10: ATTACHMENT C - TREATMENT OPTIONS CO
Page 15 and 16: PROVISIONAL: SUBJECT TO CHANGE ATTA
Page 17 and 18: ATTACHMENT A - DRAFT LEPS ITEM 11.5
Page 19 and 20: LAND inSights ATTACHMENT A - DRAFT
Page 57 and 58:
LAND inSights ATTACHMENT A - DRAFT
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
CA V ES R D BU SE LH WY CA V ES R D
Page 97 and 98:
CA V E S R D CA V E S R D AL B E R
Page 99 and 100:
ATTACHMENT A - DRAFT LEPS ITEM 11.5
Page 101 and 102:
SUES RD VASSE ATTACHMENT A - DRAFT
Page 103 and 104:
Page 105 and 106:
MEELUP BEACH RD CASTLE R O C K RD A
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
CA V E S R D CA V E S R D AL B E R
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
SUMMARY OF SUBMISSIONS PROPOSAL: Lo
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155:
show all

Attachments 11.4 and 11.5 - City of Busselton

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?