WSP06068 - Laserfiche WebLink

Home Browse Search

". , 0251 were (assumed) lined are: Notth Sterling Outlet C~nal. South Platte Ditch, Sterling No.1 Ditch, Har- mony No.1 Ditch and Hfghline Canal. The water a\- location strategy in this case cooslsced of allowing the diversion of the mlnlmwn of four quantities: water need. water rlght~ legal water ~vailabl11ty a~d historical diversion. Pumping 1a limited to its historical value. In the third run (Seri~g 3 or 75 perce~t ~ Efficiencv run) it 1~ assumed that. by ~hatever means, the farm efficiency has been uniformly im- proved over the entire system from d historical value of 40-50 percent (depending on areas) to a value of 75 percent. The ....ater allocation strategy for diverted surface water and fot' pumped aquifer water is the same as for Series 2. In the fourth tun (Series 4 or Pump10R QS ~eed- ad run) the system is the hlstarLcal system (no l~n- lng, no imprDved farm efflciency~ etc.) but the water al1o~ation strategy far pumped ~ater is fairly liberal. The surface water allocation strategy is the same as in Series 2 and 3. Pumping is allowed 1n excess of hiStorical value but not to exceed tbe installed pumping capacity (as e8timated from well records in 1973) nnd only enough to meet the crop water need not satisfied by the available surfac~ ~3ter at the farm. In the fifth run (Series 5 C1r Combination run) the same callaIs that .....ere lined in Series 2 are lined, th~ farm effiCiency i~ i~cTea5ed to the ~alue of 75 p~rc~nt as in Series 3. and the water alloca- tion strategy for surfa..::t' and ground \ol<ll~rs is the same as in Series ~. EVALU^TION OF TESTED STRATECIES Merit of Linin~ Canals The impact of this management strategy on the loss of water flowing out of State is negligible for the ~n~ire duration of tne 6imulation period {l952- ...~c 1961). It cannot be differentiated from the his tori cel (Series 1) run. The reductiol' in annual volume of outflow was typically about three percent. (SERifS I--HISTORIC - s.tA':SZ..C4H"'ll.~[0 IZOO \~ )"" 1000 roo( ~~ BOO ." ~~ . \ ':i~ 600 '" ,- I I! "'L I I I \^viV-j 'N '00 '"' . . , , WClt.lT'" o Water ~ fro~ canal seepage is applied to irrigated fields where it is partially consumed by crops and partially lost by percolation to the ground water. Lining raises the degree of satis- faction of irrigation water requirement by at mOSl an absotut~ 10 percent which 1n dry years do~s not SlRlCS InHISTORIC '!>E.~S1:hC"''''''LS L\f€.~ IOOr 5 i rt III ~o ~ 5 i 40 . i '0 ,^ >\\ -" "fl ,'~~d\\ . . 1 . 'I . , .,...---' j T'TPICAl'T[&R ST(IIL"'G NO I o . ~ . 10 1Z \" IRRlG4TION S(&~.W[[I( I' .. zo provide much absolute relief. farm irrigation efflctency tends to drop when ~ater supply 18 in- creased so that canal ~cepage losses which are saved by lining and delivered to farms show up in part as ground ~atet return fla~ to the river. 4