WSPC12530 - Laserfiche WebLink

Home Browse Search

0.... 'll) 00 ij'u w Hypothetical Scenario #2 The Upper Pretty River Water Conservation District desires to obtain an RICD water right. The proposed length of the boating course is 1,000 feet, and the total drop within that reach is 5 feet. The requested RICD flow rate is 1500 cfs. Evaluation The average stream slope = 5'/1,000' = 0.005 ft 1ft The requested flow rate = 1,500 cfs. The Performance Index (PI): (0.005 x 1500) x 100 : 750 Based on a PI of 750, the CWCS would recommend that the proposed reach is appropriate for the requested RICD since the PI exceeds the minimum threshold of 75. However, the requested flow rate by the applicant exceeds the CWCS's recommended flow rate of 350 cfs. Alternatively, the applicant could evaluate what minimum streamflow would be required for this reach in order to meet the minimum PI. PI : 75 Slope: 0.005 ft/ft Solving; Flow: 75/100/0.005: 150 cfs. Therefore, the CWCS's recommended flow range for the stream reach in this scenario (for whitewater boating) is from 150 cfs up to 350 cfs. Hypothetical Scenario #3 The City of Flatland desires to obtain an RICD water right for a stream reach located within their community for the purpose of developing a whitewater boating course. The proposed length of the boating course is 1,200 feet, and the total drop of the natural stream within that reach is 3 feet. The requested RICD flow rate is 150 cfs. Evaluation The average stream slope: 3'/1,200' : 0.0025 ft 1ft The requested flow rate: 150 cfs. The Performance Index (PI): (0.0025 x 150) x 100 : 37.5 Based on a PI of 37.5, the CWCB would recommend that the proposed reach is not appropriate for the requested RICD (for whitewater boating) since the PI is less than the minimum recommended PI of 75. The slope is also less than the 13