Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department...
-
Upload
sydney-steele -
Category
Documents
-
view
234 -
download
1
Transcript of Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department...
![Page 1: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/1.jpg)
HydrologyRainfall - Runoff Modeling (II)
Synthetic unit hydrographs
Prof. Ke-Sheng Cheng
Department of Bioenvironmental Systems Engineering
National Taiwan University
![Page 2: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/2.jpg)
Synthetic unit hydrographs For areas where rainfall and runoff data are not
available, unit hydrograph can be developed based on physical basin characteristics. SCS unit hydrograph Clark’s IUH (time-area method) Linear reservoir model (Nash model)
![Page 3: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/3.jpg)
SCS unit hydrograph
![Page 4: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/4.jpg)
Misuse of SCS UH – an example
![Page 5: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/5.jpg)
Clark’s IUH (time-area method) The concept of isochrones
Isochrones are lines of equal travel time. Any point on a given isochrone takes the same time to reach the basin outlet. Therefore, for the follwoing basin isochrone map and assuming constant and uniform effective rainfall, discharge at the basin outlet can be decomposed into individual contributing areas and rainfalls.
![Page 6: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/6.jpg)
Contributing area and contributing rainfall
![Page 7: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/7.jpg)
![Page 8: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/8.jpg)
Using the basin isochrone map, the cumulative contributing area curve can be developed. The derivatives or differences of this curve constitute the instantaneous unit hydrograph IUH(t).
![Page 9: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/9.jpg)
If the effect of watershed storage is to be considered, the unit hydrograph described above is routed through a hypothetical linear reservoir with a storage coefficient k located at the watershed outlet.
For a linear reservoir with storage coefficient k, we have
![Page 10: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/10.jpg)
Consider the continuity of the hypothetical reservoir during a time interval t.
![Page 11: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/11.jpg)
Example. A watershed of 1000-acre drainage area has the following 15-minute time-area curve. The storage coefficient k of the watershed is 30 minutes. Determine the 15-minute unit hydrograph UH(15,t).
![Page 12: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/12.jpg)
![Page 13: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/13.jpg)
Area between isochrones t = 0 and t = 0.25 hr is 100 acres. Since we are interested in the unit hydrograph UH(15-min, t), the rainfall intensity in the time period (0.25 hr) should be 4 inch/hr. Therefore, the ordinate of UH(15-min, t) at time t = 0.25 hr is:4 inch/hr (1/12 ft/inch) (1/3600 hr/sec) 100 acres
(43560 ft2/acre) = 403.33 cfs
![Page 14: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/14.jpg)
坡地開發滯留池之水文設計Hydrological Analysis for Detention Pond Design in Hillslope Development
![Page 15: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/15.jpg)
坡地開發水文設計相關規範
![Page 16: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/16.jpg)
![Page 17: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/17.jpg)
![Page 18: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/18.jpg)
![Page 19: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/19.jpg)
![Page 20: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/20.jpg)
![Page 21: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/21.jpg)
![Page 22: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/22.jpg)
![Page 23: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/23.jpg)
![Page 24: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/24.jpg)
![Page 25: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/25.jpg)
![Page 26: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/26.jpg)
![Page 27: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/27.jpg)
現行設計規範之檢討
![Page 28: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/28.jpg)
![Page 29: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/29.jpg)
![Page 30: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/30.jpg)
![Page 31: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/31.jpg)
![Page 32: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/32.jpg)
![Page 33: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/33.jpg)
![Page 34: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/34.jpg)
![Page 35: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/35.jpg)
![Page 36: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/36.jpg)
![Page 37: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/37.jpg)
![Page 38: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/38.jpg)
![Page 39: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/39.jpg)
![Page 40: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/40.jpg)
![Page 41: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/41.jpg)
![Page 42: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/42.jpg)
![Page 43: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/43.jpg)
![Page 44: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/44.jpg)
![Page 45: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/45.jpg)
![Page 46: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/46.jpg)
![Page 47: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/47.jpg)
![Page 48: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/48.jpg)
![Page 49: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/49.jpg)
![Page 50: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/50.jpg)
![Page 51: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/51.jpg)
![Page 52: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/52.jpg)
![Page 53: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/53.jpg)
![Page 54: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/54.jpg)
![Page 55: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/55.jpg)
![Page 56: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/56.jpg)
![Page 57: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/57.jpg)
![Page 58: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/58.jpg)
![Page 59: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/59.jpg)
![Page 60: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/60.jpg)
![Page 61: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/61.jpg)
![Page 62: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/62.jpg)
![Page 63: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/63.jpg)
![Page 64: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/64.jpg)
逕流量分析 ( 水土保持技術規範第 十七條 )洪峰流量之估算,有實測資料時,得採用單位歷線分析;面積在一千公頃以內者,無實測資料時,得採用合理化公式 (Rational Formula)計算。合理化公式如下:
。公頃:集水區面積小時公釐:降雨強度
無單位:逕流係數
秒立方公尺:洪峰流量式中,
)(
),/(
),(
),/(
360
1
A
I
C
Q
CIAQ
p
p
![Page 65: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/65.jpg)
滯洪設施規劃設計原則 ( 水土保持技術規範第 九十五 條 )
![Page 66: Hydrology Rainfall - Runoff Modeling (II) Synthetic unit hydrographs Prof. Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan.](https://reader033.fdocuments.us/reader033/viewer/2022061306/55147f4b550346b2598b49af/html5/thumbnails/66.jpg)
滯洪量之估算( 水土保持技術規範第 九十六 條 )