DEPARTMENT OF LANDS AND SURVEY. SWAMP DRAINAGE. REPORT FOR THE YEAR ENDED 31st MARCH, 1923, TOGETHER WITH STATEMENT OF ACCOUNTS.

Appendix to the Journals of the House of Representatives, 1923 Session I-II, C-04

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Session 11. 1923. NEW ZEALAND.

DEPARTMENT OF LANDS AND SURVEY. SWAMP DRAINAGE. REPORT FOR THE YEAR ENDED 31st MARCH, 1923, TOGETHER WITH STATEMENT OF ACCOUNTS.

Presented to both Houses of the General Assembly pursuant to Section 13 of Ike Swamp Drainage Act, 1915.

Sir, — Department of Lands and Survey, Wellington, sth June, 1923. In pursuance of section 13 of the Swamp Drainage Act, 1915, I forward herewith the report of the Chief Drainage Engineer upon the operations carried out under the above Act for the past year, together with a statement of cash transactions and balance-sheet. Wherever possible, operations are being vigorously prosecuted, and the use of new and improved dredges has materially increased the work of drainage and reclamation. Three plans showing operations are attached. I have, &c, J. B. Thompson, Under-Secretary. The Hon. D. H. Guthrie, Minister of Lands.

REPORT BY CHIEF DRAINAGE ENGINEER. Sir, - I have the honour to submit my annual report on the areas proclaimed under the Swamp Drainage Act, 1915. No new areas have been proclaimed during the year, but the Act was amended to provide for the expenditure of moneys out of the Swamp Land Drainage Account, required for the drainage, reclamation, roading, or otherwise rendering fit for settlement of any area of Crown land or national-endowment land which is not comprised within a drainage area. This amendment is a valuable one, as it saves the necessity for proclamation of small areas, and it has been availed of in one instance, report on which will be found herein. Kaitaia Drainage Area (39,665 Acres), Mongonui County. The principal works carried out during the year have been the improvement of the Awanui River channel, excavation of the Whangatano spillway to provide an overflow channel for flood-waters, and enlarging of the Waihoe channel to provide an outlet for Lake Tangonge and Pukepoto watershed into the Awanui River. Dredging has been steadily carried on throughout the year on each of these channels. Rainfall records have been kept at the Kaitaia office, and the heights reached by floods at various points recorded in terms of a datum to which sea-level and all levels throughout the area have been reduced. The total rainfall for the year was 44-81 in., the highest month's fall being in October (7-46 in.) and the lowest in January (2-02 in.). The following are some of the details of the records as obtained during the past few years :■ —

From the above records the average rainfall for the past five years is 45-27 in., consequently last year's fall was just about the average.

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Year. Rainfall. Wettest Month and Fall. Driest Month and Fall. 1918-19 1919-20 1920-21 1921-22 1922-23 47-30 in. 31-71 in. 53-11 in. 49-42 in. 44-81 in. Oct., 1918—9-06 in. July, 1919—7-37 in. .. May and Aug., 1920—8-02 in. each Maroh, 1922—5-84 in. .. Oct., 1922—7-46m. .. Aug., 1918—1-39 in. Dec, 1919—0-62 in. Mar., 1921—1-13 in. Jan., 1922—2-24 m. Jan., 1923—2-02 in.

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Readings on the gauges installed on the Awanui River ranged from 54-90 to 70-75 at Foster's Bridge, and from 66-20 to 80-00 at Church Road Bridge. The water-level at Kaitaia was lower than previously experienced, due mainly to the dredging of the river. The lowest readings were in January and the highest in October. The heaviest flood of the year occurred on the Ist October, following 445 in. of rain within forty-eight hours. At the maximum readings of the gauges as shown above the Awanui River overflowed its banks at many points, and a large area of low-lying country was inundated to a depth of several feet, showing the urgent necessity for the Whangatanc spillway and other works to increase the channel-capacity for run-off from this watershed. The work already completed, however, enabled the flood-waters to quickly disperse from the upper end of the swamp, so that in twenty-four hours from the flood reaching its height the level had dropped 5 ft., and the river was confined to its channel, except where the banks are very low, mainly in the vicinity of Awanui, where the inundation continued for some days. Awanui River. —Dredging of this river has been carried on throughout the year, the old channel being widened, deepened, and straightened. Eight diversions were cut through to straighten the river, and a total distance of 118-26 chains dredged, bringing the improved channel to a point below cut No. 12. Some 67,542 cubic yards of spoil were removed, consisting of sand and hard clay, which required blasting in some cases to facilitate work with the grab. A large quantity of heavy timber was also removed from the river-bed. Some snagging was done in the vicinity of Kaitaia, where scouring and erosion has taken place, thus undermining trees growing along the banks. Thirty chains of the river was cleared of willows along the stretch cut off by cut No. 30, so -as to keep open the channel for outlet from Church Gully. All timber snagged last year was burnt off in the dry season and banks cleaned up. Piles were driven in cut No. 30 for a bridge with 12 ft. roadway, and a temporary footbridge thrown across there to carry foot traffic till the permanent structure is erected. Whangatane Spillway. —Dredging of this channel was carried on with the Bay City dipper dredge, working from the upper end, an old munga being followed with cuts through high clay ridges to straighten the channel; 92-50 chains of this spillway was excavated 30ft. wide, the depth ranging from 15 ft. in the highest country to 6 ft. in the lowest ground cut through ; 39,980 cubic yards of spoil were removed by the dredge, and also some heavy timber, but this has hot been encountered in any great quantity so far. Very hard clay was dredged in places, and this entailed much blasting before it could be expeditiously handled by the machine. In addition to the dredging 11,000 cubic yards of spoil was removed from the spillway with plough and scoop, this being necessary to allow the dredge to excavate to the required depth in the high country. Scooping was done mostly by bullock teams working on contract, the contract price being Is. 3d. per cubic yard. Three bridges were erected over the new channel excavated —one on Donald's road, for general traffic, and two on the properties severed, to take stock and light loads. Waihoe Channel. —The erection of a Priestman grab dredge for this work was completed in August, 1922, and excavation commenced in the middle of the month, working from the Awanui River towards Lake Tangonge. Following the channel constructed by hand, a new cutting was made, 35 ft. wide and averaging 8 ft. deep, throughout the portion now completed. A distance of 52-50 chains has been dredged, and 31,722 cubic yards of spoil removed, consisting of peat and soft clay with timber intermingled. Slips occurred as this new cutting was made in this soft country, therefore a dam was built in the lower end to maintain an even water-level, and this lias prevented a recurrence of the trouble caused by the country closing in behind dredge. The lake was tapped in March with excavation to the full depth available for this channel. The unwatering of the depression in which the lake was formed will not, however, be fully accomplished until the dredge has reached the deeper part and the dam is removed, but flood-waters can now run off more quickly, and benefit is derived in this area. Dredges. —Three dredges have been working within the area on the works described above ; two have worked throughout the year, while dredger No. 10 commenced excavating in August. The following is a comparison of dredge costs for the last two years : 1921-22—-Spoil removed, 61,309 cubic yards; cost per cubic yard, 10-2 d. 1922-23 Spoil removed, 138,900 cubic yards; cost per cubic yard, 10-47 d. Drains and Roads. —As the opening of the outfalls to be constructed by hand was practically completed last year, little work of this nature was carried out during this year, and until completion of dredged channels the deepening and establishment of final grades cannot be carried out on many drains. 101 chains of new drain was constructed. The maintenance of drains was attended to, and 10 miles 68 chains of drain cleared of growth and slips. This work again proved expensive, as, owing to the drains being unfenced, a great amount of clearing was entailed through stock tramping in the sides. The road leading to Crown land via the Waihoe was fenced, road-drains constructed, and bridges erected over same, but the portion through peat country will require ballasting before it can carry traffic. Stop-banks. —103 chains of new bank were constructed along the Awanui River, with drain alongside graded to flood-gates installed near low-tide level, and eight flood-gates were placed in position. 122 chains of banks were enlarged and brought up to standard height, with drain alongside graded to flood-gates. The banks previously constructed, totalling six miles and a half, were maintained, also repaired and enlarged at certain points as required. Bridges. — Eleven bridges were constructed during the year —three pile bridges over the Whangatane spillway, and the remainder being sill bridges over drains crossing roads and severing properties. Buildings, Plants, &c. — In addition to building of pontoon for No. 10 dredge, the following plant, &c, was constructed on the works : Two pontoons, one 35 ft. by 10 ft. by 3 ft., and one 27 ft. by 10ft. by 2ft.; one pile-driver frame; three dinghys ; one three-roomed cottage; and bunkhouse, storeroom, &c,

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The following figures show the principal works carried out : New drains cut, 1 miles 2] chains ; drain-cleaning, 10 miles 68 chains ; dredge cuts, 3 miles 23 chains, new stop-banks, 1 mile 23 chains ; repairs to stop-banks. 1 mile 42 chains; willow-clearing, 30 chains; spoil excavated by dredges, 138,900 cublic yards ; spoil excavated by scoops, 11,000 cubic yards ; flood-gates erected, 8 ; pile bridges erected, 3 ; sill bridges erected, 8 ; river-diversions, 8. The dredging of the Awanui River is the most important undertaking in hand in this area, and during the latter part of the coming year this work should be expedited, as the dredge now operating in the Tangonge Lake will have completed that work, and will then assist in the river improvements. This, as well as the construction of the Whangatane spillway, will be pushed on as fast as possible, so that the deepening of drains to the final levels can be carried out. Works Expenditure. —The total expenditure for the year was £15,230, the principal items being— day labour, £6,113 ; piecework contracts, £2,368 ; and hire of teams, £658. The works are carried out under the supervision of Mr. R. G. Macmorran, Land Drainage Engineer, the officer in local charge being Mr. T. S. McMillan. Waihi Drainage Area (22,720 Acres), Tauranga County. The development of this scheme has been considerably advanced during the year, two new American steel dredges being put into operation on the Pongakawa River, and work on the subdivided Crown area being pushed vigorously ahead. Priestman dredge No. 5 has been engaged in deepening and removing silt from the Wharere Stream from the Main Road northwards towards the Waihi Estuary, and at the end of the period was well down towards the northern boundary of Section 28, having covered a distance of 211 chains and removed 91,875 cubic yards of spoil. Ample fall into the Wharere Canal is now available from the Main Road as far as the Tainui Road, and advantage is being taken of this to deepen existing outlet drains. The erection of American steel dredge No. 25 took longer than was anticipated, owing to the difficulty of putting up a strange plant without adequate working-plans, and also on account of many smaller parts not fitting, new bolt and rivet holes having to be drilled. However, this plant commenced operations on the upper end of the Pongakawa River, a few chains north of the East Coast Main Trunk Railway, at the end of June, 1922, and fairly good results were at once obtained. Many minor breakages incidental to the working of a new dredge took place, and for some time a considerable amount of timber was encountered, but latterly this has practically disappeared. Towards the end of 1922 plant was running well, and a very satisfactory yardage was being recorded each month. Owing to the soft peaty nature of the swamp and the high water-level in the cut the side spuds sink down to their full extent, and difficulty has been found in raising them preparatory to shifting ahead. The resultant heavy strain has caused several breakages on the spud-ball, and several methods have been employed with the object of diminishing this strain, the latest idea being apparently satisfactory. During the eight months worked this plant removed 55,314 cubic yards of spoil over a distance of 62| chains. As soon as dredge 25 was completed, in June, 1922, the erection gang was transferred to the mouth of the Pongakawa River, and work on dredge 26 was commenced. Progress was satisfactory, and plant started dredging operations in hard sandy country towards the end of October, 1922. Good results were obtained until the beginning of February, 1923, when the crank-shaft of the sixcylinder engine carried away, and dredge was then laid up for two months waiting for new shaft, and later for new spud-ball to replace one transferred to No. 25. During the four months worked a total of 24J chains was completed, some 17,338 cubic yards of spoil being removed. This dredge is bringing up 8 ft. of water at low tide, and as the excavation is mainly through very hard sand, which is always difficult to shift, progress for some time will necessarily be slow. However, when the softer going is reached the dredge will have good high banks, and should proceed at a much faster rate. The following table shows the amount of spoil dredged and costs per cubic yard for the last six Years : — ~ . r< -U- \r j Cost per Cubic Yard. CuUg 1917-18 .. .. .. .. 55,538 4-57 d. 1918-19 .. .. .. ..20,780 7-67 d. 1919-20 .. .. .. ..44,250 9-29 d. 1920-21 .. .. 63,495 7-77 d. 1921-22 .. .. .. ..77,535 6-17 d. 1922-23 .. .. .. ..164,527 6-97 d. Both road and drain work on the subdivided Crown area between the Wharere Canal and the Kaikokopu Stream have been pushed on rapidly, and by the end of the period the Kaikokopu Road was completed for 47 chains, Tainui Road for 31 chains, and Arawa Road for 54 chains, in addition to which fascines have been laid along a further 80 chains of Tainui Road, and spoil from large drains on either side of road distributed evenly over a width of 20 ft. down the centre. The ballasting of these roads with spoil has been expensive, as all spoil has had to be carted in drays from ballast-pits, which are situated in each case at one end of the roads in question. A new drain was constructed along the northern boundary of Sections 35 to 38, whilst the Punene and Arawa road-drains have been deepened. South of the rail way-line the Punene and Wharere drains have been deepened and widened, and the Mangatoetoe Stream has also been completed to the southern boundary of Section 8, Block VIII, Maketu Survey District. Certain improvements were carried out to the Kaikokopu Stream, south of

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the Main Road, where the dredging operations finished some years ago. These improvements consisted mainly of the removal of timber from the section between the Main Road and the East Coast Railway, whilst farther south several bends were eased off, and in other places the banks cleared of growth, and in a few cases short diversions were made at very bad bends in the stream. Farther east the drain on the boundary of Sections 14 and 15, Block 11, Waihi South, was deepened as much as the culvert under the railway-lino would allow. A considerable amount of timber was found in all these drains, necessitating a free use of explosives, but now that timber has been removed drains are in first-class order. Drains have been cleaned when found necessary, but so far this is a comparatively small item, but during each successive year this item must increase. The summary of the works completed during the year is as follows : — M. eh. Cub. yd. Canals dredged .. .. .. .. . . 3 58 164,527 New drains .. .. .. .. .. .. 6 25 19,038 Widening and deepening drains . . . . . . 6 18 Cleaning drains .. .. . . .. 3 27 Clearing road-lines .. .. . . . . 3 24 Carting and spreading spoil on roads . . . . . . . . 7,339 During the year a ballot was held for seven sections fronting the Main East Coast Road, and at least twenty more sections, varying from 20 acres to 50 acres in extent, should be available for selection next spring, provided the ballasting of the Tainui Road can be carried out during the coming winter. The major works proposed to be carried out during the coming year are as follows : (1) Completion of the deepening of the Wharere Canal ; (2) straightening of the Pongakawa River ; (3) ballasting of roads, particularly the Tainui Road ; (4) extension of drainage-system on to area between Wharere Canal and Pongakawa River. When the Priestman dredge (No. 5) reaches the estuary an endeavour will be made to increase the tidal influence for both the Wharere and Pongakawa. Should this be successful, the drainage of a large area of the swamp will be much more easily accomplished. The total expenditure during the year was £11,673. Of this amount £3,973 was expended in day labour (including dredges) and £2,640 in piecework contracts. The officer in charge is Mr. R. G. Macmorran, Land Drainage Engineer. The local officer on the works was Mr. R. L. Innis. This officer was transferred to the Rangitaiki works at the end of the year, and has been succeeded by Mr. D. S. B. Heather. Poukawa Drainage Area (13,567 Acres), Hawke's Bay County. Construction-work on this swamp has been held up for some years now owing to the dispute with the Native owners of portion of this area. The dredge pontoon, which was constructed in 1916 and has been in the water ever since, must now be showing signs of deterioration, and unless work is commenced shortly it would be advisable to dismantle this pontoon and dispose of the timber for what it will fetch. The rainfall at the site of the works was 24-81 in., which is below the average in spite of a heavy fall of 6-82 in. in January. The expenditure for the year was £97 17s. Bd., which was entailed in paying the wages of the caretaker and a few incidentals. Hikurangi Drainage District (50,000 Acres), Whangarei County. Development-works in connection with the above project were commenced in December, 1921, and since then these works have gone steadily forward. The work in hand comprises the diversion and lowering of the Wairua River bed at a point known as " The Rapids," situated some seven miles below the swamp. The diversions, of which there are four, are of a total length of 65 chains, and the material to be excavated consists of a substratum of rock, with an overburden of rock boulders and clay. Summer water-level at the point of completion is 18-5 ft. above summer level at the point of commencement, and the work will result in the summer level of the river above the diversion being lowered by 12 ft. This advantage will later be carried up into the swamp proper by removing all shallows in the river and cutting off all bad bends. The works are not designed to absolutely prevent flooding—the costs of such a work would be quite beyond the financial capacity of the area —but they are calculated to reduce the frequency and duration of floods to such an extent as to enable the country to be successfully farmed. Cut No. I. —The top stripping of this cut was completed before the end of last year. The substratum of rock, rock-boulders, and clay proved very difficult to economically break out, and necessitated a more liberal use of explosives than was at first anticipated. Considerable working-time was lost owing to flooding, and in order to minimize this trouble in the work ahead it was decided to cut the top off the falls situated some distance down-stream and to excavate the cut to a depth of 4 ft. below grade. The extra excavation required somewhat delayed the date of completion of this particular cut, but this will be more than recovered as the work proceeds up-stream. This cut is now completed, and the water in the lagoon at the top end has been lowered by 11 ft., leaving the old channel high and dry.

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Cut No. 2. —The top stripping of this cut was commenced in the last month of last year. The country proved of a very mixed nature—large floating boulders being found right to the surface, with hard-pan and mixed clays intermixed. The stripping has now been completed and a start made with the bottom lift. The three machines are now being concentrated on this cut, and thus by carrying the work forward in a face instead of carrying on all cuts simultaneously water troubles and other difficulties will be largely overcome and more steady progress maintained. A ford for the machines and a footbridge giving access to this cut have been constructed. Cut No. 3.—The top stripping of this cut was completed during the period under review. This proved generally much more easily excavated, although in places large boulders and rubble wero encountered up to the surface. Cut No. 4. —Work commenced on this cut in August, after the line had been cleared of all bush and logs. This cut skirts the foothills, and consequently on the high side there is little room for depositing spoil. In order to find space for this spoil it was necessary to double-handle the material on the lower side. The work is well advanced and the already excavated spoil well removed from the edge of the cut. Now that the water-level at the lower end of No. 2 cut has been lowered and a start made on the bottom heading of that cut the machine handling this cut has been withdrawn and moved down-stream, as stated formerly. Plant. —The plant consists of three Bucyrus shovels convertible to drag-lines, seven air-com-pressors, two oil-locomotives, one Thornycroft 2-ton lorry, and a smithy and fitting-shop equipped with lathe and power-drill, &c. Compressor Plant. —The seven compressor units have given very general satisfaction, and only minor repairs have been required. The machines have been brought into the fitting-shop in turn for complete overhaul. The benzine-consumption is necessarily a big item of expense, but now that the work is in a position to be handled in a face these compressors will carry a more even load and the distributed costs will not be so severe. General. —The rock-excavation is proving very severe on the shovels, and the wear-and-tear is naturally great. The machines have all been thoroughly overhauled and weakened parts renewed, and are now in good working-order. As can only be expected, the cost of repairs and time occupied in overhauls will be much greater than on machines working in earth excavations. The machines— Bucyrus shovels convertible to drag-lines—are giving excellent results despite the fact that the excavations are of a particularly heavy nature. They are very flexible and adaptable to almost any conditions. Practically all repair works with the exception of castings are executed in our own shop on the works.

The following is a summary of the output of the steam-shovels for the different cuts : —

The approximate cost of excavation is ss. 3-7 d. per cubic yard. Works Expenditure. —The total expenditure for the year was £20,760, of which day labour accounted for £8,380. Mr. R. S. Logan, who was in local charge of these operations, resigned at the end of the year, and Mr. G. E. Tuck has now taken over control. The following operations were carried on under the authority of the Swamp Drainage Amendment Act, 1922 :— Mangawai Drainage. —The drainage of Black's Swamp, near Mangawai, was undertaken in order to enable the area to be worked in small areas for winning kauri-gum. Some 173 chains of main drain were constructed, of an average depth of 6 ft. In places the old stream was followed, whilst in others a new channel was constructed. Since the completion of this contract a deviation of the stream has been made in the lower reaches through a low sand-ridge, in order to improve the drainage higher up. The area tapped by the drain is now being worked by a large number of diggers, and from all accounts satisfactory returns are being obtained. The expenditure on the work was £1,758 17s. lOd. I have, &c, O. N. Campbell, The Under-Secretary for Lands, Wellington. Chief Drainage Engineer.

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1921-22. 1922-23. Totals to Date. Cut. Clay. Rock. Clay. Rock. — Clay. Rock. No. 1 .. No. 2 .. No. 3 .. No. 4 .. Falls .. Cub. yd. 6,040 3,400 560 Cub. yd. 5,260 1,150 140 Cub. yd. 1,826 23,475 14,350 10,118 680 Cub. yd. 11,837 2,190 1,060 4,010 2,510 Cub. yd. 7,866 26,875 14,910 10,118 680 Cub. yd. 17,097 3,340 1,200 4,010 2,510 Totals 10,000 6,550 50,449 21,607 60,449 28,157 i Grand total .. 88, 606

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Swamp Land Drainage Account. Receipts and Payments Account for Year ended 31st March, 1923. Receipts. £ s. d. Payment*. Balance at Ist April, 1922 .. .. 18,221 11 11 Kaitaia Drainage District— £ s. d. £ s. d. Debentures issued under Swamp Land Drainage-works, &c. .. 10,773 19 3 Drainage Act, 1915 .. .. 45,000 0 0 Loose tools .. .. 82 8 3 Interest on surplus funds temporarily Live-stock .. . . 22 5 0 invested .. .. .. .. 72 2 0 Fuel and stores .. 3,069 13 II Management and engineering expenses.. . . 985 3 2 14,933 9 7 Waihi Drainage District— Drainage -works, &c. .. 7,979 10 1 Loose tools ... . . 28 8 8 Stores and fuel .. 2,352 1 9 Management and engineering expenses.. .. 482 8 0 10,842 8 6 Poukawa Drainage District— Drainage-works, &o. .. 91 5 0 Management expenses .. 3 0 0 94 5 0 Hikurangi Drainage District — Drainage-works, &o. .. 11,192 19 4 Loose tools .. .. 199 19 10 Live-stock .. .. 32 10 0 Fuel and stores .. 5,616 14 7 Management and engineering expenses .. 1,271 16 10 18,314 0 7 Mangawai Drainage District— Drainage-works, &c. .. 1,723 310 Management and engineer ing expenses.. .. 35 14 0 1,758 17 10 Plant and machinery .. .. 3,367 16 9 Interest on debentures .. .. 10,268 16 0 Cash in Public Account at 31st March, 1923 3,713 19 8 £63,293 13 11 £63,293 13 11 Swamp Land Drainage Account. Balance-sheet as at 31st March, 1923. Liabailities. Assets. Debentures issued under Swamp Land £ s. d. £ s. d. £ s. d. Drainage Act, 1915 .. .. 268,000 0 0 Kaitaia Drainage District — Public Works Fund—Land Improvement Drainage-works ..110,590 6 4 Vote .. .. .. .. 4,563 19 7 Interest Account (proporSundry creditors for interest on deben- tion chargeable to disturos .. .. .. .. 4,779 7 4 trict) .. .. 20,094 15 7 Sundry creditors .. .. .. 4,146 0 5 130,085 111 Waihi Drainage District— Drainage-works .. 34,774 6 9 Interest Account (proportion chargeable to district) .. .. 5,331 0 4 40,105 7 1 Poukawa Drainage District— Drainage-works .. 2,528 5 10 Inlcrest Account (proportion chargeable to district) .. .. 646 17 8 3,175 3 6 Hikurangi Drainage District— Drainage-works .. 29,501 19 6 Interest Account (proportion chargeable to district) .. .. 2,539 2 6 32,041 2 0 Mangawai Drainage District — Drainage-works .. 1,864 14 6 Interest Account (proportion chargeable to district) .. .. 113 19 7 ; 1,978 14 !. Buildings .. .. .. 1,301 6 0 Plant and machinery .. .. 63,754 15 4 Loose tools .. .. .. (its 5 6 Live-stock .. . . .. 171 0 0 Fuel .. .. .. .. 2,026 9 10 Stores on hand .. .. .. 1,857 11 0 Cash in Public Account .. .. 3,713 19 8 £281,489 7 4 £281,489 7 4 J. B. Thompson, Under Secretary. J. H. O'Donnell, Chief Accountant.

Approximate Cost of Paper. —Preparation, not given ; printing (625 copies, including plans), £41.

Authority : W. A. G. Skinner, Government Printer, Wellington.—l 923.

Price Is. 6d.]

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PLAN OF KAITAIA DRAINAGE DIST.

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PLAN OF HIKURANGI DRAINAGE DIST.

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PLAN OF WAIHI DRAINAGE DIST.