Rye and Dericent Drainage. 



145 



names ; a number must be inserted in every field or parcel of property correspond- 

 iug with that in the book of reference hereinafter mentioned, and each parish must 

 be numbered separately — that is, he must begin with No, 1 in each parish. He must 

 accurately ascertain and show on the maps the average flood-water line, and the 

 lands liable to inundation must be distinguished by colour or otherwise. The exact 

 course where levels are taken must be noted on the map in faint dotted red lines ; 

 and the situation of the stakes, bench marks, &c., and all descriptive particulars as 

 to heights, sufficiently plain at once to enable the valuers to refer to them and the 

 book which will contain a description of the levels hereinafter alluded to. 



" Reduced Map. 



" 2Dd. That the surveyor shall furnish another map, at a scale of 12 chains to 

 i inch, containing all the same particulars as the other, with the exception of the 

 main lines of the survey, and shall be similarly drawn on the best drawing-paper, 

 mounted on linen. 



" Tracings for Valuers. 

 " 3rd. That the surveyor shall furnish three tracings, mounted on calico, of the 

 map of 4 chains to 1 inch, to the valuers and umpire for their use. 



" Books of Beference. 

 " 4th. That the surveyor shall make out a correct collected book of reference, 

 taking each parish separately, and the name of the townships (if any) within the 

 parishes must also be stated, setting forth the number of each field or parcel of pro- 

 perty on the map, the names of owner and occupier, quantity in acres, roods, and 

 perches, and state of cultivation, which shall also exhibit each person's total owner- 

 ship or occupation in the whole work ; and shall furnish one copy with each map, 

 and one with each tracing, for the use of the valuers and umpire, making in all 

 five copies. 



" Levels. 



" 5th. That the surveyor shall take a system of levels up the valleys of the Rye 

 and Derwent, and across all lands liable to inundation or likely to be benefited by 

 this drainage, having reference to one fixed datum point. He will advise with the 

 valuers on the most proper mode of taking his levels ; but most probably he will 

 find it desirable to take lines of longitudinal levels (all connected of course) up the 

 principal valleys, and at every 20 chains or so, and cross levels across the valleys 

 at or about right angles to them. He must drive in stakes at every 10 chains dis- 

 tance on the lines of levels, which stakes must be of sound red pine, 2 feet 6 inches- 

 in length and 14- inch square, and must be driven 2 feet into the ground, thus 

 leaving 6 inches out, which must be painted white, and the relative height of the 

 ground at that point to the datum must be stated on the stake, either by being.- 

 branded or painted in black figures ; and a uniform cut must be made round the 

 stake in the earth ; all these stakes must be numbered consecutively, and the same- 

 number must appear on the plan section and book of reference to the levels. He- 

 must leave permanent bench marks on the coping of bridges or any other available 

 fixed points at not more than 1 mile apart ; all the bench marks must be marked 

 alike, and cut into the stone, &c. 



" Section. 



" eth. That the surveyor shall furnish sections of all his levels at a scale of 

 4 chains to 1 inch horizontal, and 20 feet to 1 inch vertical measure ; the datum 

 must be fully and particularly described ; and the bottoms of all brooks or water- 

 courses crossed by the lines of levels, heights of the points where pegs are driven 

 in, permanent bench marks, crossing of roads, &c., must be noticed ; and the 

 vertical height in feet and inches from the datum line shall be written up to each 

 of these points. The level line of average flood-water must also be shown. 



" Reference to Levels. 

 " 7th. That the surveyor shall furnish a book of reference to the section, setting 

 forth every particular and explanation requisite which shall refer to the stakes, 

 bench marks, and other objects on the plan and section, and will also contain the 

 surveyor's remarks on what he may consider to the point. 



Time fur Completion of the Work. 

 " 8th. That a portion of the tracings of map and of the book of reference must 

 be placed in the hands of the valuers on or before th,^ 15th of -May, 1847 ; and the 

 VOL. XIV. L 



