Arizona weekly journal-miner., 1897-08-04
wArsh STORAGE
oltr Enrinser tirhsr,a Rspart.

0ity Engineer Fishers Report.
 PxzseorF. JUEH Q. lss7. Honorable Mayor and Common Council of ths
 City of Prescott
 GxNrLExu-I herewith hand you my report of survey for storage reSeFYoirs on Banning Greek, the sites Of which are located on Mr. Thorbeck's ranch. about three miles southeast Of Prescott
 These dams. if built. should be rubble ma sorry laid up in cement mortar
 The first or lower one ia located at the head Of the marrow canon st tho lower end of said ranch:
 Dam. ss feet high.
 Crest of dam. 1so' long.
 Base Of dam. sT long.
 Thicknes ss of wall at base. IT s".
 Thickness of wall at crest 2.
 Amount Of mason,y in dam io2t cubic yds. Superficial area of reservoir. 3.Ss aeres. Approximate capacity of reservoir, Ii. .2Sa a2o gallons.
 Natural flow Of stream. so.ooo gala per 2a hrs. Approximate cost Of dam. masonry figured at t7.oo per GU. yd.. s7.Oo ssl
 UPPER nRzKayoIB AND pAM.
 The site of this dam is located just below the ranch buildings. where a reef 0f rocks crosses the basin;
 Dam, 65' high.
 Crest of dam. Tso feet long
 Base of dam. i0o feet long.
 Thickness of wall al base of dam. sg 6'. Thickness Of wan at csest Of dam. c. Amount oi masonry in dam. i5.ss2 eu. ydG Superficial area of reservoir. aa.2 acres. Approximate capacity of reservoir. iai.eis,' o0o gallons.
 Approximate cost os dam. sIlI.I7Loa
 These reservoir sites are about 2so feet higher than the city reservoir, 70 that water from eiths< place could be piped Into the city reser. yolr. I very carefully mnaaured Inc flow of water in Banning creek. on bed rock. by c weir. which gave mo 5000 gallons per 2a houTA l, also. made some sur Veya between Aspen Greek and Posts' Crook 10 determine as to the possibility of divertiDg the Aspen Creek water into the Potts' Greek reservoir site. found a low divide between the two creeks, through which Aspen Crock can be dive Tted into Potts' Greek. I estimate that Q canal three miles long would divert ct least 75 per cent Of the Aspen Creek water into Potts Cresk.
 The Potts Creek water shed above the dam Site is about Jour square mllea. Easing Ou ? calculations on IA inches average rainfall and that Go per cent of that amoang win and its way down Potts Crock. would give us 500 million gAIlons per year flowing io waste in Potts Greek.
 Ifthis water was held by storage dam, and If we allow bo per cent of 1t for loss in eTapora- ton. percolAti0n. etc. we would have ieft 250 million gallons for the use Of Prescott: an amount suisclent to fumi sa 40Oo people loo gallons per capita per day for s15 days I have made calculations for a masonry dam, at Potts Creek reservoir site, which would i'm pound approximately is0 million gallons as follows. towit:
 The height of d am to be 6S feet
 Crest of dam, 300 feet long.
 Base of dam, 4S feet long.
 Thickness of wall at base. s2'5 feet Thickness ofwall at crest feet.
 Amount Of masonry in dam, 6oSs GU. yds. Approximate cost of dam, sl6 46S.oO; masOnry estimated at e per GU yd.
 This site is about the aame elevation above Prescott as tho Aspen Greek ate. and about the same distance to pipe the water. dam ot this size would store sufficient water for 4ooo people. snd at any time when this capacity is insufficient to supply the city. the dam can be enlarged and by constructing the ditch from Aspen Creek. thus insuring a sufficient supply far q large city.
 dam of equal size on Potn' Greek, as on Aspen Greek. wo Id store about the same amount of water. Yours Resps,
 J. J. FISHER. City Engineer.